# Codon One: Biology Study — DNA, Genetics, Evolution

> Interactive biology learning app with modules, quizzes, and molecular tools. (iPhone/iPad app by Daniel Gebert.)

- Source: https://appshunter.io/ios/app/codon-one-biology-study/id1517313390 (this page in markdown: same URL + `.md`)
- Developer: [Daniel Gebert](https://appshunter.io/developer/1517313389)
- Category: Education, Reference
- Price: Free with in-app purchases
- Rating: 4.40/5 from 23 App Store ratings · 17 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 252 MB
- Languages: American English, Czech, Danish, Dutch, French (France), German (Germany), Indonesian, Italian, Japanese, Korean and 10 more
- Released: 2020-07-08
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews.md

## What is Codon One?

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.

## Key features

- Interactive learning modules
- Quick quizzes for comprehension
- Clear diagrams and plain language
- Molecule reference guide
- Sequence analysis tools
- Genetic code exploration

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Module 2: Genetics | $2.99 | one-time |
| Module 3: Evolution | $2.99 | one-time |
| Module 4: Science History | $2.99 | one-time |
| Unlock All | $8.99 | one-time |
| Module 5: Cell Biology | $2.99 | one-time |
| Module 6: Development | $2.99 | one-time |
| Module 1: Chemistry of Life | Free | one-time |


## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews.md

### 1/5 — Impossible

*2026-04-24*

As a student currently in BIO 101 I can say without a DOUBT that Codon Learning is the absolute worst part of my education. My own biology professor has to correct incorrect information that Codon ‘teaches’ us because the information is completely inaccurate sometimes. Not only that, but the Homeworks are genuinely so stressful. Please add more than two attempts on a question. Speaking of questions, stop adding so many per module and stop adding multiple sections to one question. Holy workload. Making us work just to work.

**Developer response:** We’re sorry this was your experience, but several points in this review do not match how Codon One works. The app does not include homework assignments. Each section has a fixed short 6-question review quiz with unlimited attempts, and students can also lock or unlock sections using the Edit button in the module view.

Accuracy is extremely important to us. Codon One’s content is created and reviewed by educators/researchers with PhDs in biology who work at leading universities. If your professor has identified specific inaccurate content, please send the module, question, or screenshot to codon-one@gmx.de so we can review it carefully. We are always open to concrete feedback and will correct any verified issue.

### 1/5 — 不喜欢

*2026-02-14*

不好用

### 5/5 — Super ⭐️

*2025-01-02*

Alors j’ai cherché une application pour m’apprendre la biologie, je suis tombé sur cette application parfaite je ne trouve rien à redire, j’attends les mises à jour pour plus d’enseignement que ça soit sur la biologie cellulaire ou autres.
Je ne regrette absolument pas mon investissement je me régale.
Surtout sur les codons pour trouver les acides aminés c’était une super idée franchement.

### 5/5 — Ótimo!

*2024-12-09*

De uma maneira fácil e prática você consegue aprender várias coisas úteis
De uma maneira rápida.

### 1/5 — Le prix

*2024-10-12*

Je dirais que l’on devrais laiser plus de possibilité sans payer.

### 5/5 — Wow!

*2024-09-02*

Klar und übersichtlich, toll strukturiert, hat sich schon auf der dritten Seite gelohnt!
Vielleicht kann der Test direkt nach dem Kapitel folgen, ohne ein extra auswählen?

### 2/5 — No muy recomendable

*2024-08-08*

La app se basa en cuestionarios, interesantes i de un nivel medio que es genial para repasar conceptos importantes pero solo tienes acceso a los dos primeros bloques, acidos nucleicos i aminoacidos, i una vez superados estos, necesitas comprar los siguientes bloques. Se queda corta como app, además no tiene ningún espacio donde aprender, solamente responder preguntas

### 5/5 — Appli géniale !

*2023-12-11*

Tellement pratique pour reprendre des notions rapidement !

### 5/5 — App interessante

*2023-11-28*

Consiglio vivamente di installarla. Da molte informazioni chiare  su argomenti interessanti

### 5/5 — Maravilhoso!!!

*2023-08-03*

Esse app é fantástico

## Frequently asked questions about Codon One

### What biology topics does Codon One cover?

Codon One covers Molecular Biology, Genetics, Evolution, and the Chemistry of Life. Specific modules include biomolecules, DNA replication, protein synthesis, natural selection, and cell biology.

### How does Codon One help users learn?

Learning occurs in short, focused sections with clear diagrams and plain language, followed by quizzes to check understanding and unlock further content. This method breaks down complex ideas into memorable chunks.

### What are the built-in tools in Codon One?

Codon One features a Sequence Operator for DNA analysis (reverse, complement, transcribe, translate), a Codon Picker to explore the genetic code, and a Triplet Encoder for DNA sequence generation.

### Is Codon One suitable for beginners?

Yes, the app is designed to build a solid foundation in biology, using clear diagrams and plain language to make complex topics accessible to learners of all levels.

### How often is Codon One updated?

The app was last updated on November 3, 2025, indicating active development. More modules are in development and will be added over time.

### What devices support Codon One?

Codon One is available on iPhone, iPad, and iPod, making it accessible to a wide range of Apple users.

### Does Codon One have ads?

No, Codon One does not contain advertisements, providing an uninterrupted learning experience for users.

### What is the age rating for Codon One?

Codon One has an age rating of 4+, making it suitable for a broad audience interested in learning biology.

## Version history (last 5 releases)

### 2.5.2 — 2026-08-11

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.

### 2.5.1 — 2026-07-24

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.

### 2.5.0 — 2026-07-06

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.

### 2.4.1 — 2025-11-03

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.

### 2.4.0 — 2025-10-17

- 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.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*