Spaced repetition flashcards, daily games, and 1,500+ key terms — covering all 8 AP Biology units. Free, forever.
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Full syllabus coverage
Cramly covers every topic from the AP Biology curriculum framework, with flashcards organized by unit.
Water and its properties, biological macromolecules (carbohydrates, lipids, proteins, nucleic acids), condensation and hydrolysis, and the properties of carbon.
Prokaryotic and eukaryotic cell structure, organelles, the fluid mosaic model, cell transport (diffusion, osmosis, active transport), and cell communication.
Enzymes and activation energy, photosynthesis (light reactions and Calvin cycle), cellular respiration (glycolysis, Krebs cycle, oxidative phosphorylation), and fermentation.
Signal transduction pathways, feedback mechanisms, the cell cycle, mitosis, meiosis, cancer and apoptosis, and mechanisms of cell communication.
Mendelian genetics, Punnett grids, sex linkage, codominance, incomplete dominance, dihybrid crosses, non-disjunction, and chromosomal abnormalities.
DNA replication, transcription, translation, mutations, epigenetics, gene regulation, CRISPR, operons, and biotechnology techniques (PCR, gel electrophoresis).
Evolution and natural selection, population genetics, Hardy-Weinberg equilibrium, speciation, phylogenetics, and evidence for evolution.
Population ecology, community interactions, energy flow, biogeochemical cycles, biodiversity, climate change, and human impacts on ecosystems.
Key vocabulary
AP Biology free response questions reward precise terminology. Here's a sample of terms covered in Cramly.
…and 1,400+ more terms in the full app.
Common questions
AP Biology is divided into 8 units: Unit 1 Chemistry of Life, Unit 2 Cell Structure and Function, Unit 3 Cellular Energetics, Unit 4 Cell Communication and Cell Cycle, Unit 5 Heredity, Unit 6 Gene Expression and Regulation, Unit 7 Natural Selection, and Unit 8 Ecology.
The AP exam tests all 8 units across Section I (60 multiple choice + 6 grid-in questions) and Section II (2 long FRQs + 4 short FRQs).
AP Biology is considered one of the more demanding AP sciences. It covers a very broad range of content from biochemistry to ecology, requires strong vocabulary, and tests your ability to apply concepts to experimental scenarios you haven't seen before.
Students who perform best combine consistent vocabulary practice (flashcards, spaced repetition) with regular FRQ writing and data analysis practice using College Board released materials.
Active recall — test yourself constantly rather than rereading. Flashcards and games like Cramly's Recall mode (where you type as many biology terms as possible against a timer) force your brain to retrieve information, which strengthens retention far more than passive review.
Spaced repetition — Cramly's algorithm handles this automatically, showing you cards you struggle with more frequently and spacing out cards you've mastered.
FRQ practice — AP Biology FRQs reward precise biological language and structured answers. Use College Board released FRQs and mark schemes to practice the exact phrasing examiners expect.
Yes — completely free. No premium plan, no paywall, no credit card required. All flashcards, games, and progress tracking are available at no cost.