Comparison

Codon One vs CellWalk

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

Head to head
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.

About

CellWalk

Explore the intricate world of cells in a 3D environment, from the overall structure down to molecular details. Tap on terms to receive clear, contextual explanations powered by on-device AI, adapting to your learning level. Designed for students and educators to foster a deeper understanding of cell biology.

Highlights
  • 3D cell exploration
  • On-device AI definitions
  • Multi-level explanations
  • Interactive concept chains
  • Touch-first navigation
  • High-fidelity visuals
Read full description

Zoom from whole cells to molecular detail, and tap highlighted terms for clear, contextual explanations—powered by Apple Intelligence and Foundation Models running entirely on your device. Built to help students explore cell biology, and designed for learning. What’s new in 1.1 • “Tap-to-Learn” on-device AI definitions and concept chains. • Redesigned for iOS 26 with Liquid Glass. Concept Chains (Tap-to-Learn): Tap any term to get an explanation tailored to your level (Beginner, High School, Researcher). Keep tapping to follow a coherent chain—each step builds on your previous taps. Powered on-device by Apple Intelligence and Foundation Models, grounded in CellWalk’s scientific datasets. Key Features • Multi-Level Explanations: Switch between Beginner, High School, and Researcher levels to get the right depth for your background. • Interactive Learning (On-Device AI): Conversational definitions grounded in CellWalk’s scientific datasets—no cloud required. • Touch-First Exploration: Pinch, pan, and orbit smoothly across scales, from cell architecture to molecular structure. • High-Fidelity Visuals: Metal-accelerated rendering for crisp, responsive scenes. • Expert-Guided Intro: Start with a free introduction to Mycoplasma bacteria narrated by Dr. David Goodsell. • Rich Scientific Content: Thousands of modeled proteins with concise, accurate descriptions. • Elegant UI: Refined browser with Liquid Glass for fast, focused navigation. • Ideal for students, educators, and anyone curious about how cells work—delivered with clarity and scientific rigor.

Screenshots

Codon One4 screens
CellWalk3 screens

Verdict

The call

The clearest difference is rating: CellWalk at 4.9 against Codon One's 4.4. CellWalk also leads on review sentiment (92% vs 76%) and ratings volume (69 vs 23). Codon One's advantage is iOS requirement (15.6 vs 26.0). On price, update cadence, ads and in-app purchases 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 and CellWalk sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

CellWalk holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 23 and 69 respectively. Written reviews point the same way: 76% of Codon One's written reviews are positive against 92% of CellWalk's.

UpkeepUpdate frequency

Codon One ships an update every 3 weeks, CellWalk monthly. The most recent releases landed on September 8, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
Codon One versus CellWalk: the parameters behind the verdict, then further details
ParameterCodon OneCellWalk
PriceFreeFree
Rating4.4 (23 ratings)4.9 (69 ratings) — better
Positive reviews76.5% of reviews91.7% of reviews — better
Number of ratings2369 — better
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Vision Pro
Requires iOS15.6 — better26.0
Further details — not scored
Size252 MB635 MB
Age rating4+4+
DeveloperDaniel GebertAko Biotica Inc.

Customer experience

Codon One

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

CellWalk

All ratings69 ratings
Positive95.7%
Neutral2.9%
Negative1.4%
Written reviews60 reviews
Positive91.7%
Neutral0.0%
Negative8.3%

Bugs and requests

Codon One

Not enough reviews yet to summarise bugs or requests.

CellWalk

Reported bugs

4 issues
  • ATP synthase described backwards
  • Renderer noise causes nausea
  • Buggy and low framerate
  • Renderer not responsive to head movements

Requested features

10 requests
  • More cells to explore (eukaryotic, mammalian, computer cells)
  • More content and depth
  • Expand on descriptions with an 'expand on' feature
  • Add tutorials for new users
  • Add color to highlighted text for easy reference
Show 5 more
  • Depict a minimal eukaryotic cell
  • Depict a cell undergoing mitosis
  • Make cell models free-floating instead of behind windows
  • Option to purchase additional content
  • Update renderer for responsiveness to head movements

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
1 purchases

CellWalk

One-time1
  • Pro Lessons$14.99

Questions

Is Codon One free?
Codon One is free to download, with in-app purchases available.
Is CellWalk free?
CellWalk is free to download, with in-app purchases available.
Which has better reviews, Codon One or CellWalk?
CellWalk is rated higher. Codon One averages 4.4 out of 5 from 23 ratings, while CellWalk averages 4.9 from 69 ratings.
Do Codon One or CellWalk have ads?
Neither Codon One nor CellWalk shows ads.
Which is updated more often, Codon One or CellWalk?
Codon One ships an update every 3 weeks, and CellWalk monthly. Most recently, Codon One was updated on September 8, 2026 and CellWalk on September 21, 2026.

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