What is *The Psychology of Intelligence* by Jean Piaget about?

*The Psychology of Intelligence* explores Jean Piaget’s foundational theory of cognitive development, emphasizing how children actively construct knowledge through **adaptation**, **assimilation**, and **accommodation**. The book identifies four stages of intellectual growth (sensorimotor, preoperational, concrete operational, and formal operational) and argues that intelligence is a biological adaptation shaped by interactions with the environment.

Who should read *The Psychology of Intelligence*?

Educators, developmental psychologists, and parents interested in child cognition will find this book essential. It’s also valuable for students studying epistemology or anyone seeking to understand how logical reasoning evolves from infancy to adulthood.

Is *The Psychology of Intelligence* worth reading in 2025?

Yes. Despite critiques, Piaget’s work remains a cornerstone of developmental psychology, offering timeless insights into learning processes. Modern researchers still reference his frameworks to study AI, education, and neuroplasticity.

What are the four stages of cognitive development in Piaget’s theory?

1. **Sensorimotor** (0–2 years): Learning through senses and motor actions. 2. **Preoperational** (2–7 years): Developing symbolic thought but lacking logical reasoning. 3. **Concrete operational** (7–11 years): Mastering conservation and inductive logic. 4. **Formal operational** (12+ years): Abstract and hypothetical thinking.

How does Piaget define intelligence?

Piaget describes intelligence as a **biological equilibrium** achieved through adaptive interactions between an organism and its environment. It involves balancing assimilation (integrating new experiences into existing mental frameworks) and accommodation (modifying frameworks to fit new information).

What are key quotes from *The Psychology of Intelligence*?

- “Intelligence is what you use when you don’t know what to do” underscores problem-solving as its core function. - “Every acquisition of accommodation becomes material for assimilation” highlights the iterative nature of learning.

What are common critiques of Piaget’s theory?

Critics argue Piaget underestimated young children’s capabilities and overemphasized universal stages, neglecting cultural and individual differences. Modern studies show some logical reasoning emerges earlier than he proposed.

How does Piaget’s theory compare to Vygotsky’s sociocultural approach?

While Piaget focuses on **self-directed cognitive construction**, Vygotsky emphasizes **social interaction and cultural tools** (e.g., language) as drivers of development. Piaget’s stages are universal; Vygotsky’s “zone of proximal development” is context-dependent.

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The psychology of intelligence Summary

Jean Piaget

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The psychology of intelligence Summary Overview

Piaget's revolutionary exploration of how humans develop intelligence transformed education worldwide. Written during Nazi occupation, this foundational text challenged how we understand learning. Beyond psychology, it reshaped fields from sociology to corporate training - a blueprint for understanding how minds truly evolve.

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Chapter 1

The Mind's Blueprint: How Intelligence Evolves From Birth to Maturity

Jean Piaget's "The Psychology of Intelligence" revolutionized how we understand cognitive development. This groundbreaking work, published in 1947, remains a cornerstone of developmental psychology, influencing education systems worldwide. Beloved by educators and psychologists alike, the book has sold millions of copies and been translated into over 20 languages. Even tech visionaries like Steve Jobs cited Piaget's theories as influential in developing intuitive interfaces. What makes this work so enduring is Piaget's remarkable insight that intelligence isn't fixed at birth but evolves through distinct stages as children interact with their environment. His work challenged the prevailing behaviorist views of his time and established a framework that continues to shape how we understand the developing mind.

Chapter 2

Intelligence as Adaptive Equilibrium

Intelligence, according to Piaget, exists at the intersection of biology and logic. Rather than being an isolated faculty or fixed trait, intelligence represents the highest form of mental adaptation-a dynamic system of living operations that facilitates interaction between the individual and their world. It's the ultimate expression of equilibrium toward which all cognitive structures naturally tend. This conceptualization marks a significant departure from traditional views that treated intelligence as a static capacity measured by IQ tests. Every psychological response takes the form of adaptation or re-adaptation when the balance between organism and environment is disrupted. These responses always involve two inseparable aspects: the affective (energetic) and the cognitive (structural). The affective life concerns internal energy regulation and factors controlling energy exchanges with the external environment, while cognitive functions involve structuring relations between environment and organism. For example, when a child encounters a new toy, their emotional response (curiosity, excitement) works in tandem with their cognitive processing (understanding how it works, categorizing it). Though distinct, these aspects are inseparable-we cannot reason without feelings, nor experience emotions without understanding. What distinguishes psychological adaptation from purely organic adaptation is its functional nature. While organic adaptation involves material interpenetration between organism and environment (such as digestion or physical growth), psychological adaptation operates through functional interaction across increasing spatio-temporal distances along increasingly complex paths. A child first learns to manipulate objects directly, then progresses to mental representation of absent objects, and eventually to abstract reasoning about hypothetical scenarios. Intelligence represents the pinnacle of this adaptation, freeing action from dependence on the immediate here and now, aiming to assimilate all reality and accommodate to it. This adaptation can be defined as an equilibrium between two complementary processes: assimilation (the organism's action on the environment) and accommodation (the environment's action on the organism). For instance, when learning mathematics, a student both assimilates new concepts into their existing understanding and accommodates their mental structures to grasp novel mathematical principles. As intelligence develops, these processes become increasingly balanced, allowing for more sophisticated interactions with the world. The hallmark of mature intelligence is its capacity to maintain this equilibrium while handling increasingly abstract concepts and complex relationships, from concrete problem-solving to theoretical reasoning and creative innovation. The development of this equilibrium follows a predictable sequence, moving from sensorimotor intelligence in infancy through concrete operations in childhood to formal operations in adolescence. Each stage represents a more sophisticated form of adaptation, characterized by increasingly complex forms of organization and greater stability in the face of perturbation. This progression demonstrates how intelligence evolves from simple reflexive responses to sophisticated abstract thinking capable of dealing with hypothetical situations and complex logical operations.

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Chapter 3

Operations: The Building Blocks of Thought

At the heart of Piaget's theory lies the concept of operations-mental actions that transform reality in thought. Operations aren't simply any actions; they are internalized actions that form part of organized, logical structures. An operation in isolation is merely an intuitive representation; operations exist only as coherent systems. This is where Piaget breaks with logical atomism that had hindered previous theories of thought. A "class" cannot exist by itself-it presupposes a classification system. Similarly, relations like "less than" exist only within complete systems of serial relations. Numbers exist only within number sequences, spatial relations within whole spatial frameworks, and values within complete scales. Psychological reality consists of complex operational systems, not isolated operations. The essential problem becomes understanding the equilibrium laws governing these systems. For mathematical thought, the notion of a "group" has become central. For qualitative logical systems like classifications and series, Piaget introduces the concept of "groupings"-forms of equilibrium of internalized actions organized in complex structures. These groupings must satisfy five essential conditions: 1. Combinativity: Any two elements can combine to produce a new element of the same grouping 2. Reversibility: Every operation can be undone-the most clearly defined characteristic of intelligence 3. Associativity: Different paths can lead to the same result 4. Identity: An operation combined with its opposite is nullified 5. Tautology: In qualitative elements, repetition doesn't transform (A+A=A) The presence of a grouping can be recognized by the operations a subject performs and by the appearance of conservation principles-a subject capable of operational reasoning knows that certain properties remain unchanged despite superficial transformations. For instance, a child with operational thinking understands that the amount of liquid remains the same when poured from a short, wide container into a tall, narrow one, despite the visual difference.

Chapter 4

The Developmental Journey: From Sensorimotor to Formal Operations

Intelligence doesn't emerge fully formed but develops through a series of qualitatively distinct stages, each building upon and transforming the achievements of previous stages. This developmental progression reveals how intelligence gradually evolves from practical action to abstract thought. The journey begins with sensorimotor intelligence (birth to approximately 2 years), where infants progress from reflexive behaviors to intentional actions. Initially, newborns interact with their environment through innate reflexes like sucking. Through practice (reproductive assimilation), these reflexes become more efficient. Gradually, infants extend these patterns to new objects (generalized assimilation) and learn to discriminate between different situations (recognition assimilation). As development continues, circular reactions emerge-actions repeated for their effects. First come "primary circular reactions" focused on the infant's own body, followed by "secondary circular reactions" directed toward external objects. By 8-10 months, these schemata begin coordinating with each other as means and ends. A child will remove a screen to grasp a partially hidden object-deciding the goal before determining the means, indicating mobile articulation of elemental schemata. The culmination of sensorimotor intelligence occurs during the second year with the emergence of mental representation. Children demonstrate sudden insight without trial-and-error, like immediately understanding a stick's potential to retrieve a distant object. These internal coordinations represent sensorimotor schemata becoming sufficiently mobile for mutual assimilations that no longer require actual trials. With language acquisition comes the symbolic function-the ability to represent reality through "significants" distinct from what they signify. This marks the beginning of preoperational thought (2-7 years), characterized first by symbolic and preconceptual thinking, then by intuitive thought. During this period, children's thinking remains egocentric and centered on perceptual appearances rather than logical relations. Around age 7-8, concrete operational thought emerges, marked by the appearance of conservation-understanding that certain properties remain unchanged despite perceptual transformations. Children can now perform logical operations like classification, seriation, and numerical operations, but only with concrete objects or situations they can directly perceive or manipulate. Finally, formal operational thought develops around age 11-12, enabling adolescents to reason hypothetically and systematically about abstract possibilities. They can formulate and test hypotheses, consider multiple variables simultaneously, and engage in propositional logic-operating on operations themselves rather than directly on reality.

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Chapter 5

Perception and Intelligence: Connected yet Distinct

Perception provides knowledge through direct contact with objects, while intelligence operates when detours are required and distances between subject and objects increase. A central question is whether intellectual structures pre-exist in perceptual organizations-the core claim of Gestalt theory. The Gestalt approach posits that mental systems always exist as organized wholes rather than synthesized isolated elements. Perception isn't built from prior sensations but is governed by a "field" whose elements are interdependent. Even a single dot on paper is perceived as a "figure" against a "ground," demonstrating field organization. For intelligence, Gestalt theorists describe sudden "restructurings" of perceptual fields, as when an ape perceives a stick as an arm extension. While acknowledging Gestalt psychology's valuable descriptions, Piaget challenges their assumption that perceptual organization remains constant throughout development. If perceptual structures develop over time, we can no longer dismiss their formation or the role of experience. The improvement with age in transposition ability suggests perception involves active construction rather than simple reappearance of equilibrium forms. Despite their continuity, perception and intelligence differ fundamentally in structure. Perceptual structures approach but never achieve the five conditions of operational groupings. Where perceptual structures approach operational conservation (as in perceptual "constancies"), operations are replaced by simple, partially reversible regulations. In perception, each modification produces a "displacement of equilibrium"-a new equilibrium distinct from the previous state-while operations maintain mobile yet permanent equilibrium through exact compensation via reversibility. As perceptual activity develops, it leads to increasingly mobile analysis approaching but never fully achieving the reversibility characteristic of operations. Perceptual activity introduces coherence and progressive synthesis, closely connected to sensorimotor intelligence and approaching the threshold of operations without crossing it.

Chapter 6

From Habit to Intelligence: The Sensorimotor Foundations

The distinction between motor and perceptual functions is merely analytical. Perception influences motor activity from the outset and vice versa, forming what Piaget calls sensorimotor schemata that characterize infant behavior. After moving beyond purely hereditary reflexes, infants acquire habits through experience that provide the foundation for later intelligence. Claparede's theory of trial-and-error learning evolved significantly over time. Initially opposing intelligence (adaptation to new conditions) to habit and instinct (adaptations to repeated circumstances), he later located trial-and-error not at the starting point of intelligent inquiry but at its margins. He proposed that once inquiry is directed by need or question, the first occurrence is an awareness of "implicative" relations-a "primitive tendency" without which subjects couldn't profit from experience at any level. Research shows that even the earliest trials resist reduction to chance, with responses directed from the outset and continuity in initially adopted approaches. Animals apply successful behaviors from previous situations to new analogous ones through complex structuring with sign-gestalts-schemata provided with meanings. The construction of the object concept and spatial relations illustrates this developmental progression. In early stages, the object remains unformed and space stays centered on the subject. A third-stage infant who sees an object move along a path behind a screen will look back toward the starting point rather than seeking it beyond the screen-clear evidence of egocentric perspective and absence of object permanence. Only gradually does the child construct a system where objects have permanent existence independent of perception and action, and where spatial relationships become objective rather than egocentric. While sensorimotor intelligence constructs practical group structures in immediate space, these organizations remain limited by action constraints and don't yet constitute thought.

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Chapter 7

The Transformation: From Action to Thought

The transition from sensorimotor intelligence to conceptual thought requires fundamental structural transformations. While sensorimotor intelligence provides practical equivalents of classes, relations, and reasoning, significant differences remain in both structure and application scope. Sensorimotor intelligence consists of coordinating successive perceptions and movements without achieving comprehensive representation-like a slow-motion film showing successive frames without fusion. Three essential conditions mark this transition: increased speed allowing simultaneous understanding of successive action phases; awareness of action mechanisms rather than just results; and expanded distance enabling symbolic actions beyond immediate space-time limits. Thought isn't merely a translation of sensorimotor processes into symbolic form-it requires complete reconstruction on a new plane. To construct operational thought structures, the child must overcome intellectual egocentricity just as they previously overcame perceptual-motor egocentricity. This intellectual decentralization-moving from self-centered thinking to systems of relations and classes independent of the self-occupies early childhood as the child reconstructs at the conceptual level what was previously achieved at the sensorimotor level. The acquisition of language coincides with the development of the symbolic function-the ability to represent reality through "significants" distinct from what they signify. Piaget distinguishes between indices/signals and symbols/signs. Indices constitute objective parts or aspects of what they signify, while symbols and signs involve conscious differentiation between significant and significate. Symbols imply similarity between significant and significate, while signs are arbitrary and conventional, requiring social context. True symbolic play appears only when objects or gestures represent something beyond perceptible data-not during the sensorimotor period but at its conclusion with "symbolic schemata" that evoke absent situations. Mental imagery isn't a primary fact but an internal imitation-an active copy rather than a sensory residue.

Chapter 8

The Concrete Mind: Building Operational Thought

Around age four, children's thinking becomes stable enough for experimental interrogation, indicating a new cognitive structure. From ages 4-7, there's gradual coordination of representative relations leading from symbolic thinking toward operations, though intelligence remains pre-logical. This intermediate stage relies on "intuitive reasoning" controlled by intuitive "regulations" analogous to perceptual adjustments. The limitations of intuitive thought are revealed in conservation tasks. When identical quantities are poured from one container to another with different dimensions, 4-5 year-olds conclude the quantity changes-saying there are "more" if the new container is taller or "fewer" if it's thinner. The error stems from "centering" attention on single dimensions rather than coordinating multiple dimensions simultaneously. These intuitive regulations correct errors but only reactively, without logical multiplication of relations. The transition to operational systems represents a crucial developmental turning point marked by a rapid equilibration that transforms intuitive structures. Unlike static Gestalt crystallizations, operations emerge through a "thawing out" of rigid intuitive structures, creating mobile systems that are both complete and indefinitely extensible. The key criterion for recognizing when intuitive relations become "grouped" into operations is conservation-not merely assumed through probable induction but affirmed with certainty. This mobile equilibrium emerges when actions become combinable, reversible, and associative; different paths can reach the same point; returning to the starting point finds it unchanged; and repeated actions have logical consequences. These properties represent complete decentralization-a fundamental shift from egocentric, "centered" thinking to systematic, objective thought that can follow all possible changes and viewpoints. In practice, these operational groupings emerge around age 7-8, enabling logical operations like class inclusion, serialization, and transitivity. Children simultaneously develop number concepts by combining classification and serialization, and parallel spatiotemporal operations involving time, space, length, area, and measurement. Crucially, these are "concrete operations"-tied to action and not yet formal logic. Children can perform logical operations with objects but struggle with purely verbal propositions. Moreover, operations remain content-specific-a child might understand conservation of substance but not weight or volume until later ages.

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Chapter 9

Abstract Horizons: The Emergence of Formal Thought

Formal operations represent a critical developmental reconstruction beginning around age 11-12, marked by distinct "vertical separations" from concrete operations. While children in earlier stages remain tethered to immediate action and tangible reality, adolescents develop the remarkable ability to think beyond the present moment, constructing elaborate theories about both existing and hypothetical scenarios. This expansion of mental capabilities allows them to contemplate abstract concepts like infinity, justice, and theoretical possibilities. This newfound reflective thought enables sophisticated hypothetico-deductive reasoning, where adolescents can work with assumptions that may have no basis in physical reality. They can follow chains of logical inference based purely on the validity of reasoning rather than requiring experiential confirmation. For instance, a teenager can solve problems like "if A is greater than B, and B is greater than C, then what is the relationship between A and C?" without needing concrete examples. Formal thought introduces "second-degree" operations - the ability to perform mental operations on other operations themselves rather than directly on reality. This meta-cognitive capability allows adolescents to analyze their own thinking processes and consider multiple perspectives simultaneously. For example, they can understand that different cultural viewpoints might lead to different interpretations of the same situation. The transition from concrete to formal operations reveals fascinating developmental patterns. A seriation problem (arranging objects by size) that a 7-year-old easily solves through physical manipulation becomes surprisingly challenging when presented as verbal propositions, with most children unable to solve it before age 12. This demonstrates how a 10-year-old approaching formal problems employs similar strategies to those used by 4-5 year olds with physical objects, highlighting the qualitative difference between concrete and formal thinking. Each developmental level involves both the coordination of elements from previous stages and the emergence of new differentiations. The sensorimotor schema integrates basic perception and habit formation; symbolic schemas transform imitative accommodation into meaningful symbols and representations. Intuitive schemas coordinate mental images into coherent patterns; concrete operations organize intuitive schemas into reversible mental actions; and formal schemas ultimately operate on these concrete groupings themselves, creating increasingly sophisticated logical structures. This progressive differentiation reveals the initially undifferentiated nature of early cognitive mechanisms. In early development, spatiotemporal understanding (perception of space and time), logico-arithmetical operations (basic mathematics and logic), and practical problem-solving form an interconnected whole. As development proceeds, representative thought first separates practical problem-solving from mental representation. Around ages 7-8, children develop the ability to handle logico-arithmetical operations independently from spatiotemporal operations. The final stage emerges when formal operations enable hypothetico-deductive reasoning to function independently from operations tied to concrete actions, allowing for truly abstract thought.

Chapter 10

The Social Dimension: Intelligence in Context

Society affects individual development as profoundly as the physical environment, modifying thought structure through language (signs), interaction content (intellectual values), and imposed rules (collective norms). Social interactions modify mental structures differently depending on developmental stage. During early development, children oscillate between distorting egocentricity and passive acceptance of intellectual suggestion. The child assimilates social influences in their own way, reducing them to their point of view without realizing it, unable to coordinate different perspectives. This intellectual egocentricity stems from a lack of differentiation between self and other, making the child simultaneously susceptible to suggestions from others while distorting information through their egocentric lens. Only when concrete operations and later formal operations develop does genuine logical thought emerge with important social characteristics: the capacity for cooperation (involving reciprocity between individuals who can differentiate viewpoints) and the acceptance of common rules or norms (a "morality of thinking" that prohibits contradiction and requires verification). The relationship between operational groupings and cooperation presents a circular causality. Without interchange of thought and cooperation, individuals could never group operations into coherent wholes. Yet effective exchanges of thought themselves require operational grouping as their equilibrium form. Through constant interchange with others, we develop the ability to coordinate internally different viewpoints, maintain stable meanings of concepts, and achieve thought reversibility. Intellectual interaction between individuals resembles "a vast game of chess" where each action triggers equivalent or complementary responses, with grouping laws functioning as rules ensuring reciprocity and consistency. The operational grouping within individuals and cooperation between them represent complementary aspects of the same equilibrium system-neither exclusively individual nor exclusively social in origin.

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Chapter 11

The Rhythm of Mental Growth: From Chaos to Order

Intelligence imposes structural patterns on interactions between subjects and their environment, creating increasingly sophisticated forms of organization that evolve from basic rhythms to complex operational systems. The fundamental developmental progression follows three key stages: rhythms, regulations, and groupings, each representing progressively more advanced forms of structural organization and cognitive capability. Rhythms characterize functions at the crucial junction between organic and mental life, first appearing in basic reflexes like sucking and grasping, instinctive behaviors, and elementary perception. These early rhythmic patterns, while not fully reversible, involve alternating antagonistic processes that herald later reversibility. For example, an infant's reaching and withdrawing movements, or the alternation between sleep and wakefulness, demonstrate these fundamental rhythmic patterns. Though simple, these rhythms form the foundation for more complex cognitive operations. Regulations emerge when accommodation begins to differentiate from assimilation, integrating elementary rhythms into larger, more sophisticated systems without regular periodicity. This stage marks a significant advance in cognitive development, as the child begins to modify their actions based on environmental feedback. For instance, a toddler learning to stack blocks will adjust their movements based on previous attempts, demonstrating regulatory behavior. From perception through intuitive thought, regulations moderate external changes by working in opposition to them, gradually harmonizing mental assimilation and accommodation. This process can be observed in activities like drawing, where children progressively refine their representations based on both their mental models and environmental feedback. Operational groupings represent the final equilibrium pattern toward which all mental functions ultimately tend. When complete reversibility is attained, previously rigid structures gain remarkable flexibility while maintaining stability. This allows accommodation to experience to remain in permanent equilibrium with assimilation, elevated to the status of necessary deduction. For example, a child at this stage understands that pouring water between containers of different shapes doesn't change its quantity, demonstrating conservation and reversible thinking. Piaget's theory thus presents intelligence not as a static entity but as a dynamic process of increasingly sophisticated adaptation. From the newborn's reflexive interactions with their environment to the adolescent's capacity for abstract reasoning and hypothetical thinking, intelligence evolves through qualitative transformations that enable progressively more complex and effective engagement with the world. This development can be observed in numerous domains, from logical-mathematical thinking to social understanding and moral reasoning. For instance, the progression from concrete operations to formal operations enables adolescents to think about abstract concepts, consider multiple perspectives, and engage in hypothetical reasoning. This developmental perspective revolutionized our understanding of cognition by highlighting the active role of the individual in constructing knowledge through interaction with the environment. It continues to inform educational practices, curriculum design, and psychological research worldwide, emphasizing the importance of matching learning experiences to developmental readiness and providing appropriate challenges to promote cognitive growth.

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Key Themes in The psychology of intelligence Summary

cognitive development stages
assimilation and accommodation
operational thought
mental adaptation
equilibrium of intelligence

Best Quotes from The psychology of intelligence Summary

To know an object, is to act upon it.
Intelligence is what you use when you don't know what to do.
Intelligence represents the pinnacle of this adaptation.
An operation in isolation is merely an intuitive representation; operations exist only as coherent systems.

Characters in The psychology of intelligence Summary

Jean PiagetAuthor and developmental psychologist

About the Author

Jean William Fritz Piaget (1896–1980), Swiss psychologist and pioneer of cognitive development theory, authored The Psychology of Intelligence as a cornerstone work in developmental psychology and genetic epistemology. A former professor at the University of Geneva and the Sorbonne, Piaget merged his early training in biology with clinical psychology to explore how intelligence evolves through stages of childhood development.

His groundbreaking framework—detailing sensorimotor, preoperational, concrete operational, and formal operational stages—revolutionized educational practices by emphasizing experiential learning and critical thinking.

Notable for interdisciplinary rigor, Piaget’s related works like The Origins of Intelligence in Children and The Moral Judgment of the Child further dissect the interplay between cognition, logic, and ethics. His theories underpin modern pedagogy and neuropsychology, with frameworks adopted by institutions like UNESCO and Harvard University, where he received an honorary doctorate in 1936. The Psychology of Intelligence has been translated into 20+ languages and remains foundational in psychology curricula worldwide, reflecting its enduring influence since its 1947 publication.

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I love the fact that I can get useful, condensed, information and ideas in a 8 - 15 minute podcast style audio. I'm not a general fan of podcasts because of all the fluff, but this cuts through all that.

@BeFreed user

I am finishing up my doctorate, and have to read a lot of unfamiliar material... With BeFreed, you simply enter a prompt, and the app finds source material for you and generates an audio podcast. I find the process in BeFreed to be more streamlined than NotebookLM.

@Brad

I often search YouTube for something to listen to whilst making breakfast, when I'm out walking, commuting, etc, and BeFreed has provided an even more targeted approach, without the adverts and the fluff!

@BeFreed user

The absolute best part about this platform is its versatility. There is literally no subject that is off-topic. It handles whatever you throw at it... It is rare to find an learning tool with zero limitations that actually delivers on its promises.

@jayallen

BeFreed is fantastic. The user-friendly design means I spend less time navigating and more time learning. The mix of audiobooks, podcasts, and learning plans is a genius combo that has completely changed my daily routine.

@BeFreed user

At the start I needed a while to understand how to create podcasts in italian language and boom! It is so great! I can ask to explain every argument and it does so well and so smartly!

@matteo77

BeFreed has become my daily app for audio books tools... What I like the most is the way you put your text and come with an audio that you can listen on the go.

@kotanzu1

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