Kharty vs Codon One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kharty
Transform learning into an engaging game by quizzing yourself on maps and diagrams. Create custom study materials or explore a vast catalog. Master subjects through a progressive learning method, track your progress, and challenge others.
- Create custom diagrams
- Multiple game modes
- Progressive learning method
- Track best records
- Dictation of terms
- Share creations
- Offline study
Read full descriptionHide full description
NEW Kharty AI. Say what you want to learn, Kharty creates a game for you! Kharty turns learning maps and diagrams into an exciting game! Choose from our catalog or easily create your own with AI. Quickly master any diagram with Kharty’s progressive learning method! Main Features: - Download or create your own diagrams - Multiple and engaging game modes - Progressive learning - Track and beat your best records - Dictation of terms in many languages - Share your creations with friends, students and the community - Study offline Kharty is free to download. To play and create, you need a Kharty+ subscription, monthly or yearly (the yearly plan starts with a 7-day free trial). Kharty+ includes 10 AI Khartys a month; more are available as separate in-app purchases. No more staring at textbooks, learning is now a game to have fun with: As terms are displayed and dictated, locate them in the illustration before time runs out and don’t make errors to beat your own records. Master what you’re studying and challenge your friends! Download diagrams, maps or charts: Browse the gallery for any subject, from geography and anatomy to history and vocabulary. Create your own: It couldn’t be easier, just pick an image and add in your terms, all right within the app. In no time, your new diagram will be available to study with all game modes provided by Kharty. Play and share your creations with anybody: friends, students, classmates or the entire Kharty community! Progressive learning: Don’t get overwhelmed by complex diagrams, our method makes it easy by focusing on a few terms at a time. As you master each term, more will be added, with checkpoints to ensure maximum retention. You’ll surprise yourself with how much and how fast you learn! Help us improve! Send us your feedback and diagram suggestions: contact@kharty.com Terms of Use (EULA): https://www.kharty.com/en/tos Privacy Policy: https://www.kharty.com/en/privacy
Codon One
This app simplifies complex biology concepts through short, illustrated lessons and interactive quizzes. It offers AI-powered study assistance and allows users to create flashcards from lecture slides or PDFs. Study materials are available offline.
- Short, illustrated lessons
- Interactive quizzes
- AI study helper (Ribo)
- Flashcard creation from slides/PDFs
- Offline study mode
- Glossary and review tools
Read full descriptionHide full description
Make complex biology click, and make it stick. Short, illustrated lessons explain one idea at a time, a quick quiz shows you what you've understood, and flashcards bring back what you'd otherwise forget. Module 1 is free, with no account and no subscription. Understand it, one step at a time Each section breaks complex ideas into clear explanations and diagrams, so you can follow even the hard topics. A quiz before you move on shows you where you stand. Lessons, quizzes, flashcards and the glossary all work offline, so you can study anywhere. Stuck? Ask Ribo, your AI study helper You don't have to search the web or wait for the next class. Ribo answers questions about the lesson page, glossary entry or missed quiz question in front of you. A few questions are free every day, and purchased modules give you more. Answers can be wrong, so check them against the lesson. Turn your lecture slides into flashcards Exam coming up? 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. It all happens on your device, so your slides stay with you. Keep what you've learned Turn any topic into a flashcard deck: spaced practice brings back what you'd otherwise forget and focuses on the cards you find hardest. The Review tab shows you what to do today: the cards that are due, the quiz questions worth another look, your streak and your progress. Forgot a term? The glossary has the key terms from every module, plus the 20 amino acids and the nucleobases. What you'll learn 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. Pay once, no subscription Module 1 is free. Buy only the modules you need, or all of them with Unlock All, which also includes future modules. No subscription and no expiry. Also included: Sequence Operator, Codon Picker and Triplet Encoder, for working with DNA sequences and the genetic code. Created by expert biologists. Found a bug or have suggestions? Email info@codon-one.com — we read every message.
Screenshots
Verdict
The clearest difference is ads: Codon One at none against Kharty's shown. Kharty's advantage is update cadence (every 3 days vs monthly) and rating (4.8 vs 4.5). On price, in-app purchases, monetization model 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. Kharty sells 9 in-app purchases, starting at $3.99 per month and Codon One sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Kharty holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Kharty has 205 ratings behind it against 25, so its average is the more settled of the two. Written reviews point the same way: 95% of Kharty's written reviews are positive against 76% of Codon One's.
Kharty ships an update every 3 days, Codon One monthly. The most recent releases landed on November 2, 2026 and November 11, 2026 respectively.
| Parameter | Kharty | Codon One |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (205 ratings) — better | 4.5 (25 ratings) |
| Positive reviews | 95.2% of reviews — better | 76.5% of reviews |
| Number of ratings | 205 — better | 25 |
| Update frequency | Every 3 days — better | Monthly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 — better | 15.6 |
| Further details — not scored | ||
| Size | 84 MB | 269 MB |
| Age rating | 4+ | 4+ |
| Developer | Kharty LLC | Daniel Gebert |
Customer experience
Kharty
Codon One
Bugs and requests
Kharty
Reported bugs
10 issues- Premium version performs worse
- App doesn't dictate terms
- Timer malfunctions
- App stops functioning well mid-study
- Cannot search on iPhone 15
Show 5 moreShow fewer
- Cannot add students
- Error when sending pin to students
- Country missing from list (Sahara Occidental)
- Incorrect information (manganese vs magnesium)
- App asks for all rivers when specific ones are chosen
Requested features
8 requests- Add more languages (especially Portuguese)
- Add mathematics content
- Wider study criteria
- Time limit or study schedule
- Quick review option
Show 3 moreShow fewer
- More advanced diagrams for anatomy
- More idioms available
- More languages and math
Codon One
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Kharty
- Kharty + Monthly (Student)$3.991 Month
- Kharty + Monthly (Teacher)$3.991 Month
- Kharty PRO Monthly (Teacher)7 Days trial$19.991 Month
Show 3 moreShow fewer
- Kharty + Annual (Teacher)7 Days trial$29.991 Year
- Kharty + Annual (Student)7 Days trial$29.991 Year
- Kharty PRO Annual (Teacher)1 Month trial$149.991 Year
- 3 AI Khartys$2.99
- 10 AI Khartys$6.99
- 25 AI Khartys$14.99
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 Kharty free?
Is Codon One free?
Which has better reviews, Kharty or Codon One?
Do Kharty or Codon One have ads?
Which is updated more often, Kharty or Codon One?
Other comparisons















