★★★★★
“The best biology app out there! The images are beautiful vector graphics with a well written and informative context.”Germany · App Store review
iPhone · iPad · 21 languages
Make complex biology click,
one focused lesson at a time.
Codon One breaks molecular biology, genetics, evolution, cell biology and development into short, illustrated lessons — with quizzes and clear take-home messages.
Free lessons to start · Unlock more when ready · No account needed
Scan to install on your iPhone or iPad
Loved by learners
Real App Store reviews from biology students
Reviews from learners around the world.
★★★★★
“The content is excellent: dense, clear and well organized in small chunks.”
Translated from French.
France · App Store review★★★★★
“I used this app for biology for university entrance exams and got full marks in both biology and English.”
Translated from Japanese.
Japan · App Store review★★★★★
“Made with so much care and didactics, it is really fun to learn with.”
Translated from German.
Germany · App Store review★★★★★
“Clear and well structured, worth it by the third page.”
Translated from German.
Germany · App Store review★★★★★
“Incredibly educational — concise yet keeping the relevant details, neatly split into chapters. Absolutely great.”
Translated from German.
Germany · App Store review★★★★★
“I’ve just started studying biology, and the app is a great help — it really helps to get a clear structure of the learnt knowledge.”Germany · App Store review
★★★★★
“I highly recommend installing it. It gives clear information on interesting topics.”
Translated from Italian.
Italy · App Store review★★★★★
“A really interesting app for learning the basics of science.”
Translated from Spanish.
Peru · App Store review★★★★★
“Very useful for catching up.”
Translated from Dutch.
Belgium · App Store review★★★★★
“Perfect. I have nothing to complain about. I’m waiting for updates with even more lessons.”
Translated from French.
France · App Store review★★★★★
“An honest, well-made app — worth buying.”
Translated from Chinese.
China mainland · App Store review★★★★★
“Very good. Looking forward to more modules.”
Translated from Chinese.
China mainland · App Store review★★★★★
“This app is fantastic.”
Translated from Portuguese.
Brazil · App Store reviewAverage rating: 4.7 out of 5 from 400+ global App Store ratings.
How it works
A simple loop for steady progress
Read a short lesson
Clear explanations and diagrams break complex ideas into focused sections.
Answer a quick quiz
Check understanding before moving on and unlock the next topic.
Review what matters
Use flashcards, progress stats and weak-question practice to make it stick.
Everything in one app
Built to make biology stick
Illustrated lessons
Short, focused sections distill core ideas into clear diagrams and plain language.
Quizzes that unlock
Pass a quick quiz to check understanding and open the next topic.
Flashcards
Turn any topic into a deck and review with spaced, focused practice.
Progress & streaks
Track success rates, resurface weak questions, and keep a daily streak going.
Searchable glossary
Look up every key term, the 20 amino acids and the nucleobases in a tap.
Hands-on tools
Sequence Operator, Codon Picker and Triplet Encoder to explore the genetic code.
A look inside
Designed to be a pleasure to study with.
The course
Six modules, from chemical elements to development
Chemistry of Life
From elements and bonds to water, pH, carbohydrates, lipids, proteins, RNA and DNA.
Genetics
Chromosomes, inheritance, replication, gene expression, regulation, mobile DNA and genetic change.
Evolution
Trace life's history through the tree of life, population variation, evolutionary forces and molecular change.
History of Science
Follow the ideas and experiments that carried biology from early natural history to DNA and modern genomics.
Cell Biology
Explore cell types, compartments, organelles, membranes, metabolism, signaling, movement and division.
Development
See how simple beginnings become body plans through fertilization, differentiation, morphogenesis and growth.
More on the way — Animal Physiology, Microbiology & Immunology, Plant Biology, and more.
Worldwide
Learn in your language
Codon One is fully translated into 21 languages.
- English
- Deutsch
- Español
- Français
- Italiano
- Nederlands
- Português (BR)
- Português (PT)
- Polski
- Čeština
- Dansk
- Svenska
- Norsk
- Türkçe
- Русский
- Українська
- Bahasa Indonesia
- 日本語
- 한국어
- 中文（简 / 繁）
Start building your foundation in biology.
Free lessons to start. iPhone & iPad.
4.7 stars · 400+ global ratings · No account needed
Download on theApp Store