Etch

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How Etch helps you learn

Spaced Repetition

Study smarter with scientifically-proven scheduling that shows cards exactly when you need to review them for maximum retention.

Spaced Repetition

Create Cards in Seconds

Turn any document into study-ready flashcards. Upload PDFs, photos, or handwritten notes and let AI do the rest.

Create Cards in Seconds

Image Occlusion

Create visual study cards by masking parts of diagrams, maps, and illustrations. Perfect for anatomy, geography, and more.

Image Occlusion

Everything you need to study effectively

Smart Review Scheduling

The SM-2 spaced repetition algorithm tracks your performance and schedules each card at the optimal interval, so you spend less time studying and remember more.

Spaced repetition scheduling

AI Card Generation

Upload any document, photo, or handwritten note and let AI extract key concepts and create flashcards automatically.

AI flashcard generation

LaTeX Support

Render complex math and science formulas beautifully on your flashcards with full LaTeX support.

LaTeX formula rendering

What you can do with Etch

Retain more of what you learn with scientifically-proven spaced repetition.

Retain more of what you learn with scientifically-proven spaced repetition.

Create flashcards in seconds from any document, photo, or handwritten note.

Create flashcards in seconds from any document, photo, or handwritten note.

Master complex visual material with image occlusion cards.

Master complex visual material with image occlusion cards.

Study seamlessly across all your devices with real-time sync.

Study seamlessly across all your devices with real-time sync.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Organic Chemistry

What is a nucleophilic substitution reaction?

A reaction where a nucleophile replaces a leaving group on a substrate.

Psychology

Who proposed the hierarchy of needs?

Abraham Maslow, in his 1943 paper 'A Theory of Human Motivation.'

Linear Algebra

What is a linear combination of matrices?

An expression of the form α₁A₁ + ... + αₙAₙ, where α are scalars.

Cell Biology

What are the phases of mitosis?

Prophase, Metaphase, Anaphase, and Telophase.

Pharmacology

What is the mechanism of action of aspirin?

Irreversible inhibition of COX-1 and COX-2 enzymes.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

Anatomy

What are the four chambers of the heart?

Right atrium, right ventricle, left atrium, left ventricle.

Spanish

What does 'sin embargo' mean?

However / Nevertheless.

Physics

What is Einstein's mass-energy equivalence?

E = mc², energy equals mass times the speed of light squared.

Constitutional Law

What does the 14th Amendment guarantee?

Equal protection under the law and due process.

Biostatistics

What is a p-value?

The probability of observing results as extreme as the data, given the null hypothesis is true.

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