Codon One: Biology Study2.6.0

Codon One helps you learn biology step by step, with short lessons, quick quizzes, flashcards, and a searchable glossary.

Build a solid foundation in molecular biology, genetics, evolution, cell biology, development, and the history of science. Each section breaks complex ideas into clear explanations, diagrams, and focused checks for understanding.

Core course (Modules)
Module 1: Chemistry of Life - atoms & elements, bonds, water, pH, biomolecules
Module 2: Genetics - chromosomes, replication, transcription, translation, regulation
Module 3: Evolution - history of life, phylogeny, selection, drift, speciation, molecular evolution
Module 4: History of Science - ideas, methods, and experiments that shaped modern biology
Module 5: Cell Biology - membranes & transport, organelles & energy, cytoskeleton, signaling, cell division
Module 6: Development - fertilization & body plans, differentiation, pattern formation & morphogenesis, growth & repair, evo-devo

Additional topics are planned for future updates, including Animal Physiology, Microbiology & Immunology, Plant Biology, and more.

Glossary & Flashcards
Look up the essentials in one place - key terms from every module, plus the 20 amino acids and the nucleobases.
Turn any topic into a flashcard deck and review with smart, spaced practice that focuses on the cards you find hardest.

Quiz & Progress
Practice across biochemistry, genetics, evolution, cell biology, development, and science history in a dedicated quiz area.
Track improvement with success rates and per-topic stats, and let the app resurface your weak questions for targeted review. Keep a daily streak going to build a steady habit.
Got a good question? Submit it directly from the app.

Built-in Tools
Sequence Operator: paste DNA, reverse or complement it, transcribe to RNA, translate in all six reading frames, and view length, GC content, and melting temperature.
Codon Picker: explore the genetic code, see which codons map to each amino acid or stop signal, and tweak bases to see the effect.
Triplet Encoder: write a message in amino-acid single-letter code and encode it as a DNA triplet sequence, then decode it by translation.

Found a bug or have suggestions? Email info@codon-one.com - we read every message.

Version History Meet Ribo, your AI study helper, and a new Review tab that gathers everything worth practising.

• Ribo: ask about any lesson page, glossary entry or quiz question you missed, and get a clear answer. A few questions are free every day, and purchased modules give you more.
• Review: the cards due today, your streak and progress, and the quiz questions worth another look. One tap asks Ribo why your answer was wrong.
• Lectures: photograph your slides or import the lecture PDF, and the glossary terms in them become flashcards. Swipe through the pages, zoom in and tap a term to read its entry. Terms from modules you haven't unlocked yet are marked with a lock.

Plus refreshed translations and interface polish. 2.6.0 5d ago Your flashcards now pick up exactly where you left off.

• Flashcards: step away mid-session and come back with your progress intact, or start fresh. At the end of a round, keep practising or review how you did.
• More dependable purchases: a clear status while one is awaiting approval, access the moment Apple confirms it, and restores that tell you what happened.
• Something wrong on a page? Report it right there — and if the connection drops, your message is kept.

Plus refreshed translations, crash fixes, and interface polish. 2.5.3 Sep 25 Now you can take notes as you learn.

• Notes: jot down your own thoughts on any lesson page and find them together with your bookmarks to review anytime.
• Sharper, better-fitting layouts on iPad, from lessons to the shop.
• Clearer quiz flow, more rewarding streaks, and more reliable purchases.

Plus refreshed translations, crash fixes, and interface polish. 2.5.2 Aug 11 This update makes learning with Codon One smoother and more reliable:

• Improved flashcard scheduling and clearer review intervals.
• Better separation of new, due, and mastered flashcards, plus streak progress from meaningful study sessions.
• A simpler free Module 1 unlock throughout the course and shop.
• More reliable purchases, restores, shop loading, and access synchronization.
• Improved onboarding, notifications, sharing, and translations.

Also includes crash fixes and interface polish throughout the app. 2.5.1 Jul 24 Module 6: Development is here. Follow life from a single fertilized cell to a fully formed body, with illustrated lessons on cleavage, gastrulation, cell differentiation, pattern formation, growth, repair, and evo-devo. Includes new quizzes and glossary terms.

Study smarter:
• Flashcards - turn any topic into a deck and review with spaced practice that focuses on the cards you find hardest.
• Daily streaks - build a steady learning habit and keep your run going.
• Sharper progress - track weak questions, review them again, and follow per-topic success stats.

Glossary: search key terms from all modules in one place.

Now available in more languages: Traditional Chinese, Indonesian, Japanese, Korean, Turkish, Swedish, and Norwegian. Existing translations have also been refined.

Plus smoother first-time onboarding, stability improvements, and interface polish. 2.5.0 Jul 6 Enjoy a refreshed iOS experience and share your favourite lessons with elegant new cards.
- Updated interface with the latest iOS design language for a smoother and more engaging learning experience.
- New lesson-sharing feature: create and share beautifully designed cards with images and direct links.
- General performance and visual improvements throughout the app. 2.4.1 11/03/2025 - New Module: Cell Biology — membranes & transport, organelles & energy, cytoskeleton, signaling, microscopy.
- Now you can preview locked modules before purchasing.
- Quicker progression: a Start Quiz button now appears at the end of each section.
- Practice smarter: redo a short quiz of only the questions you missed.
- Delight on perfects: subtle confetti when you ace a quiz.
- Better buttons: improved wrapping & padding for long titles.
- Stability: lots of small fixes and crash reductions. 2.4.0 10/17/2025 Fixes of bugs that newly occurred in iOS 17. 2.3.5 10/27/2023 Preparations for upcoming modules. 2.3.4 06/12/2023 Due to popular demand, we are introducing a dark mode for Codon One! 2.3.3 01/27/2023 Many users requested the option to unlock all sections of a module without having to take the section quizzes. So here it is! 2.3.2 01/22/2023 Minor error fixes 2.3.1 11/12/2022 We are excited to introduce "Module 4: Science History"! Dive into the fascinating History of Science, from the ancient Greeks to the modern research of today. 2.3.0 10/30/2022 Thanks to your excellent feedback, we made a few updates to the user interface and introduced a bookmarking system for you to store all your favorite lessons in one place. 2.2.7 08/04/2022 Corrections and content improvements. 2.2.6 03/12/2022 Text editing and minor improvements 2.2.5 02/09/2022 We have polished the texts in all the languages we currently offer. 2.2.4 01/28/2022 We've added more languages: Dutch, Danish, Czech and Portuguese! We've also improved existing localizations (Polish, Spanish, French, Italian and German). 2.2.3 01/21/2022 Text editing and internal improvements. 2.2.2 01/10/2022 Codon One is now available in additional languages: Polish, Russian, French, Spanish and Italian! 2.2.1 12/30/2021 We are happy to release "Module 3: Evolution"! Gain a firm understanding of Evolution, Natural Selection and the immense Diversity of Life on this amazing planet of ours. 2.2.0 12/01/2021 Text editing and final preparations for the release of Module 3: Evolution 2.1.9 11/20/2021 Text editing, typography changes and preparations for upcoming module 3. 2.1.8 11/02/2021 Update for iOS 15 and preparations for upcoming module 3. 2.1.7 10/04/2021 Text corrections, bug fixes, and language support update. 2.1.6 08/12/2021