Comparison

Kharty 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

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.

Highlights
  • Create custom diagrams
  • Multiple game modes
  • Progressive learning method
  • Track best records
  • Dictation of terms
  • Share creations
  • Offline study
Features
Read 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

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

Kharty4 screens
Codon One4 screens

Verdict

The call

The clearest difference is ads: Codon One at none against Kharty's shown. Kharty's advantage is update cadence (every 3 days vs every 3 weeks) 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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Kharty ships an update every 3 days, Codon One every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Kharty versus Codon One: the parameters behind the verdict, then further details
ParameterKhartyCodon One
PriceFreeFree
Rating4.8 (205 ratings) — better4.5 (25 ratings)
Positive reviews95.2% of reviews — better76.5% of reviews
Number of ratings205 — better25
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.1 — better15.6
Further details — not scored
Size84 MB277 MB
Age rating4+4+
DeveloperKharty LLCDaniel Gebert

Customer experience

Kharty

All ratings205 ratings
Positive96.1%
Neutral2.4%
Negative1.5%
Written reviews84 reviews
Positive95.2%
Neutral1.2%
Negative3.6%

Codon One

All ratings25 ratings
Positive84.0%
Neutral8.0%
Negative8.0%
Written reviews17 reviews
Positive76.5%
Neutral0.0%
Negative23.5%

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 more
  • 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 more
  • 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

9 purchases

Kharty

Subscriptions6
  • Kharty + Monthly (Student)$3.991 Month
  • Kharty + Monthly (Teacher)$3.991 Month
  • Kharty PRO Monthly (Teacher)7 Days trial$19.991 Month
Show 3 more
  • 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
One-time3
  • 3 AI Khartys$2.99
  • 10 AI Khartys$6.99
  • 25 AI Khartys$14.99
7 purchases

Codon One

One-time7
  • Module 2: GeneticsFree
  • Module 1: Chemistry of LifeFree
  • 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 Kharty free?
Kharty is free to download, with in-app purchases available.
Is Codon One free?
Codon One is free to download, with in-app purchases available.
Which has better reviews, Kharty or Codon One?
Kharty is rated higher. Kharty averages 4.8 out of 5 from 205 ratings, while Codon One averages 4.5 from 25 ratings.
Do Kharty or Codon One have ads?
Kharty shows ads; Codon One does not.
Which is updated more often, Kharty or Codon One?
Kharty ships an update every 3 days, and Codon One every 3 weeks. Most recently, Kharty was updated on November 2, 2026 and Codon One on November 3, 2026.

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