“Aristotle is so impressive. It explained a math problem to my daughter that ChatGPT couldn't figure out.”
Akshay
parent of Tara, 15
High school & APYour child's own
Your child's own
world‑class biology tutor
Pioneered by Stanford AI researchers and learning scientists, Aristotle is the world's first voice-based AI biology tutor.
From high school biology through AP Biology, Aristotle has improved thousands of grades over 22% within a week.
Trusted by families at
The curriculum
Over 320 biology skills, personalized to your child
Aristotle is designed to always know what to teach at exactly the right time.
Sample curriculum
+ 6 more science subjects available
Not startedIn progressMastered* Click a topic to see the skills inside
* Click a topic to see the skills inside
Foundations of Biology
Chemistry of Life
Cells & Cell Transport
Cellular Energetics
Cell Division & Reproduction
Molecular Genetics
Heredity
Evolution & Classification
Body Systems & Homeostasis
Ecology
Human Impact & Sustainability
Biology tutoring curriculum120 skills across 11 units
Foundations of Biology
A diagnostic on-ramp covering the inquiry and data skills every later unit assumes: experimental design, graph reading, the characteristics of life, and the levels of biological organization. Topics: Scientific Method & Experimental Design, Data & Graph Interpretation, Characteristics of Life & Levels of Organization, Measurement & Microscopy.
Chemistry of Life
The chemical basis of living systems: water's life-supporting properties, the four macromolecule families, and enzymes as catalysts. Topics: Water, Bonds & pH, Macromolecules, Enzymes & Catalysis.
Cells & Cell Transport
The cell as the structural and functional unit of life: cell theory, prokaryote/eukaryote and plant/animal structure, organelle function, and membrane transport. Topics: Cell Theory & Cell Types, Organelles & Cell Structure, Membrane Structure & Transport, Cell Specialization & Organization.
Cellular Energetics
Energy and matter transformation in cells: ATP, photosynthesis, cellular respiration, and tracing reactants and products through these pathways. Topics: ATP & Energy Flow, Photosynthesis, Cellular Respiration & Fermentation, Comparing & Connecting the Pathways.
Cell Division & Reproduction
The causal bridge from cells to genetics: the cell cycle and its regulation, mitosis, meiosis, and the genetic variation meiosis creates. Topics: Cell Cycle & Regulation, Mitosis, Meiosis & Genetic Variation, Sexual vs. Asexual Reproduction.
Molecular Genetics
The molecular information mechanism of life: DNA structure and replication, transcription and translation, mutations, gene regulation, and biotechnology. Topics: DNA Structure & Replication, Transcription & Translation, Mutations, Gene Regulation, Biotechnology & Genetic Engineering.
Heredity
Transmission and probability of traits across generations: Mendelian crosses, Punnett-square probability, non-Mendelian patterns, sex linkage, and pedigrees. Topics: Mendelian Inheritance & Crosses, Probability & Punnett Squares, Non-Mendelian Inheritance, Sex Linkage & Pedigrees.
Evolution & Classification
The unifying theory of biology: natural selection and adaptation, evidence for common ancestry, speciation, and phylogenetic classification. Topics: Natural Selection & Adaptation, Evidence for Evolution, Speciation & Common Ancestry, Phylogeny & Classification, Survey of Biological Diversity.
Body Systems & Homeostasis
How organisms maintain dynamic equilibrium: homeostasis and feedback, immunity and disease, and representative regulated systems treated as feedback examples. Topics: Homeostasis & Feedback, Immunity, Disease & Pathogens, Nervous & Endocrine Regulation, Transport & Exchange Systems, Plant Structure & Physiology.
Ecology
Ecosystem-level matter and energy dynamics: energy flow and food webs, biogeochemical cycles, population and community dynamics, and ecosystem stability. Topics: Energy Flow & Food Webs, Biogeochemical Cycles, Population Dynamics & Carrying Capacity, Community Interactions & Succession, Ecosystem Stability & Biodiversity.
Human Impact & Sustainability
Human effects on the living world: ecosystem disruption, biodiversity loss, climate change, and conservation, plus a claim-evidence-reasoning argumentation strand that builds an evidence-based argument from impact data. Topics: Human Impact on Ecosystems, Biodiversity & Conservation, Climate Change & Sustainability.
AP Biology tutoring curriculum205 skills across 8 units
Chemistry of Life
AP Exam weighting: 8-11%. Topics: Structure of Water and Hydrogen Bonding, Elements of Life, Introduction to Macromolecules, Carbohydrates, Lipids, Nucleic Acids, Proteins.
Cells
AP Exam weighting: 10-13%. Topics: Cell Structure and Function, Cell Size, Plasma Membrane, Membrane Permeability, Membrane Transport, Facilitated Diffusion, Tonicity and Osmoregulation, Mechanisms of Transport, Cell Compartmentalization, Origins of Cell Compartmentalization.
Cellular Energetics
AP Exam weighting: 12-16%. Topics: Enzymes, Environmental Impacts on Enzyme Function, Cellular Energy, Photosynthesis, Cellular Respiration.
Cell Communication and Cell Cycle
AP Exam weighting: 10-15%. Topics: Cell Communication, Introduction to Signal Transduction, Signal Transduction Pathways, Feedback, Cell Cycle, Regulation of Cell Cycle.
Heredity
AP Exam weighting: 8-11%. Topics: Meiosis, Meiosis and Genetic Diversity, Mendelian Genetics, Non-Mendelian Genetics, Environmental Effects on Phenotype.
Gene Expression and Regulation
AP Exam weighting: 12-16%. Topics: DNA and RNA Structure, DNA Replication, Transcription and RNA Processing, Translation, Regulation of Gene Expression, Gene Expression and Cell Specialization, Mutations, Biotechnology.
Natural Selection
AP Exam weighting: 13-20%. Topics: Introduction to Natural Selection, Natural Selection, Artificial Selection, Population Genetics, Hardy–Weinberg Equilibrium, Evidence of Evolution, Common Ancestry, Continuing Evolution, Phylogeny, Speciation, Variations in Populations, Origins of Life on Earth.
Ecology
AP Exam weighting: 10-15%. Topics: Responses to the Environment, Energy Flow Through Ecosystems, Population Ecology, Effect of Density on Populations, Community Ecology, Biodiversity, Disruptions in Ecosystems.
From our families
What parents are telling us
“My son told me yesterday that we should cancel his human tutor, Aristotle is doing a better job. The human tutor was $250/hour.”
Kim
parent of Andy, 13
“Sam got an A+. So it def worked!!!”
Tina
parent of Sam, 14
Why families switch
Everything an hourly tutor can't be
On demand, 24/7
No scheduling, no weekly slot. Help is there during homework at 9pm and the morning before the test.
A fraction of the cost
Unlimited sessions on a flat plan instead of paying a human tutor by the hour.
Truly personalized
Aristotle tracks every skill your child has mastered and teaches at their exact frontier: never too easy, never too far ahead.
Driven by science
How Aristotle works
Dialogue over lectures
Your child speaks — the tutor listens and responds.
Interactive engagement is the highest level of learning · ICAP Framework
Misconceptions over mistakes
Finds the conceptual gap underneath the wrong answer.
Models the reasoning pattern, not just the error · MISTAKE
Expert-level error handling
Follows the same 3-step process expert tutors use.
Novice tutors skip to correction — experts don't · Bridge
Verified every turn
Every response is checked before it reaches your child.
Turn-by-turn verification improves outcomes · TRAVER
Gets them to think
Asks your child to explain, then guides them until they get there themselves.
Socratic dialogue outperforms GPT-4 by 12% · SocraticLM
Fits your child's biology class
State, school, or home aligned curriculums
NGSS and AP standards
High school Biology skills are aligned to NGSS standards and AP Biology to the College Board framework, so tutoring matches what your child is graded on.
Your child's school
Share the syllabus or textbook and sessions follow your child's actual class, whether that's public, private, or homeschool.
Your own goals
Working toward the AP exam, a placement test, or getting a grade up? Aristotle builds the path backwards from your goal.
FAQ
Common questions about online biology tutoring
Aristotle covers high school Biology and AP Biology. High school Biology tracks 120 skills across 11 units, from the chemistry of life and cells through genetics, evolution, body systems, and ecology. AP Biology adds 205 more skills mapped to the College Board's eight units. Together that is over 320 biology skills, each one linked to its prerequisites, so the tutor always knows what your child has mastered and what comes next.
Your child talks through problems out loud with Aristotle on a shared whiteboard, whether that is tracing energy through cellular respiration, reading a genetics pedigree, or interpreting a data graph. Aristotle asks questions, listens to their reasoning, and guides them to the answer rather than handing it over. Sessions start whenever your child is ready, with no scheduling, available 24/7, during homework at 9pm or the morning before a test.
Science tutors typically charge $50 to $90 an hour, which comes to $600 to $1,080 a month at three hours a week, and AP-level tutors often charge more. Aristotle costs $299 a month for unlimited sessions across every subject, or $49 for a single session.
Chatbots hand your child the answer and forget them when the chat ends. Aristotle teaches the way expert tutors do: it asks your child to explain their thinking, finds the misconception underneath a wrong answer, and guides them with questions until they can solve it themselves. It also carries the learning process across sessions, remembering which biology skills your child has mastered and planning what to teach next, like a personal tutor who never forgets.
Yes. Parents get a summary after every session, and the parent dashboard shows which biology skills your child has mastered and where they are stuck. Sessions are reviewed, and every tutor response is checked before it reaches your child.
Yes. Biology looks like memorization but it builds fast: cellular respiration assumes you understand molecules and energy, and genetics assumes you understand cell division. Most struggles trace back to an earlier gap. Each skill on the map is linked to its prerequisites, so Aristotle finds the exact earlier skill that is missing and rebuilds from there, instead of repeating the same lesson louder.
Yes. The AP Biology course maps 205 skills to the College Board's course framework, across all eight units from chemistry of life to ecology. Aristotle teaches at your child's frontier rather than their grade level, so a strong student can start AP material early or use sessions to review weak spots before the exam.
Yes. High school Biology is aligned to NGSS standards and AP Biology to the College Board framework, and the tutor personalizes to your child's actual class. Share the syllabus, textbook, or upcoming test topics and sessions will follow what is happening in school.
Meet your child's biology tutor
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