Comparison

CellAtlas vs Codon One

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Blood cell morphology guide
  • Expert-written mini lectures
  • Extensive cell image database
  • CellQuiz game
  • Knowledge testing
Read 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.

About

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.

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

CellAtlas3 screens
Codon One4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Codon One sells 7 one-off in-app purchases. CellAtlas asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
CellAtlas versus Codon One: the parameters behind the verdict, then further details
ParameterCellAtlasCodon One
PriceFreeFree
Rating3.2 (21 ratings)4.4 (23 ratings) — better
Positive reviews88.8% of reviews — better76.5% of reviews
Number of ratings2123 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size106 MB252 MB
Age rating4+4+
DeveloperCellaVision ABDaniel Gebert

Customer experience

CellAtlas

All ratings21 ratings
Positive47.6%
Neutral19.0%
Negative33.3%
Written reviews80 reviews
Positive88.8%
Neutral3.8%
Negative7.5%

Codon One

All ratings23 ratings
Positive82.6%
Neutral8.7%
Negative8.7%
Written reviews17 reviews
Positive76.5%
Neutral0.0%
Negative23.5%

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 more
  • 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 more
  • 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

None

CellAtlas

No in-app purchases

7 purchases

Codon One

One-time7
  • Module 1: Chemistry of LifeFree
  • Module 2: Genetics$2.99
  • Module 3: Evolution$2.99
Show 4 more
  • 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?
CellAtlas is free to download, with no in-app purchases.
Is Codon One free?
Codon One is free to download, with in-app purchases available.
Which has better reviews, CellAtlas or Codon One?
Codon One is rated higher. CellAtlas averages 3.2 out of 5 from 21 ratings, while Codon One averages 4.4 from 23 ratings.
Do CellAtlas or Codon One have ads?
Neither CellAtlas nor Codon One shows ads.
Which is updated more often, CellAtlas or Codon One?
CellAtlas ships an update every 2 months, and Codon One every 3 weeks. Most recently, CellAtlas was updated on September 22, 2026 and Codon One on September 8, 2026.

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