CellAtlas vs Codon One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CellAtlas
Explore blood cell morphology with expert-written lectures and a vast image database. Test your knowledge with an engaging quiz game designed for efficient learning.
- Blood cell morphology guide
- Expert-written mini lectures
- Extensive cell image database
- CellQuiz game
- Knowledge testing
Read full descriptionHide full description
Welcome to the CellAtlas Application - your guide to blood cell morphology. CellAtlas contains mini lectures written by hematology experts complemented by an extensive cell image database. The App also includes a game, CellQuiz. A fun and efficient way to test your knowledge in cell morphology. CellAtlas is a product from the medical technology company CellaVision.
Codon One
Master molecular biology, genetics, evolution, and life chemistry through interactive modules and quizzes. Explore essential concepts with clear diagrams and concise explanations. Includes helpful tools for sequence analysis and genetic code reference.
- Interactive learning modules
- Quick quizzes for comprehension
- Clear diagrams and plain language
- Molecule reference guide
- Sequence analysis tools
- Genetic code exploration
Read full descriptionHide full description
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.
Screenshots
Verdict
The clearest difference is rating: Codon One at 4.4 against CellAtlas's 3.2. Codon One also leads on update cadence (every 3 weeks vs every 2 months). CellAtlas's advantage is in-app purchases (none vs 7) and review sentiment (89% vs 76%). On price, ratings volume, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Codon One sells 7 one-off in-app purchases. CellAtlas asks for nothing beyond the download.
Codon One holds the better App Store score, 4.4 against 3.2. Both are backed by a comparable volume of ratings — 21 and 23 respectively. Written reviews complicate that: 89% of CellAtlas's written reviews are positive against 76% of Codon One's, so the app with the better star average is not the one people write more warmly about.
CellAtlas ships an update every 2 months, Codon One every 3 weeks. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.
| Parameter | CellAtlas | Codon One |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (21 ratings) | 4.4 (23 ratings) — better |
| Positive reviews | 88.8% of reviews — better | 76.5% of reviews |
| Number of ratings | 21 | 23 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 106 MB | 252 MB |
| Age rating | 4+ | 4+ |
| Developer | CellaVision AB | Daniel Gebert |
Customer experience
CellAtlas
Codon One
Bugs and requests
CellAtlas
Reported bugs
6 issues- Timer is too short
- Quiz moves too slowly after correct answer
- Duplicate images that only one counts
- App not opening on some devices
- Missing WBCs
Show 1 moreShow fewer
- Layout issues on older iPhones
Requested features
22 requests- Remove timer option
- Untimed mode
- More time for quizzes
- Quizzes for specific cells/sections
- More images/examples
Show 17 moreShow fewer
- Larger database of cells
- More examples of atypical/abnormal cells
- Ability to practice specific cell types
- Option to quiz on specific cell types
- More options for tests (e.g., malignancies)
- Ability to practice maturation stages
- Zoomable slides
- Labels for cell structures
- Side-by-side cell comparison
- Save quiz results
- Add body fluid images
- Add coag cascade
- Add disease states/inclusions
- Link to LIS system
- More photos
- Updates for more cell pictures
- Support for older iPhone screens
Codon One
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CellAtlas
No in-app purchases
Codon One
- Module 1: Chemistry of LifeFree
- Module 2: Genetics$2.99
- Module 3: Evolution$2.99
Show 4 moreShow fewer
- Module 4: Science History$2.99
- Module 5: Cell Biology$2.99
- Module 6: Development$2.99
- Unlock All$8.99
Questions
Is CellAtlas free?
Is Codon One free?
Which has better reviews, CellAtlas or Codon One?
Do CellAtlas or Codon One have ads?
Which is updated more often, CellAtlas or Codon One?
Other comparisons















