Fathomly vs Kaja AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fathomly
Master any subject with interactive, bite-sized lessons and adaptive quizzes. This app uses cognitive science principles like active recall and spaced repetition to ensure long-term knowledge retention. Engage in learning duels and tournaments to test your understanding and build a daily learning habit.
- Interactive courses on any topic
- Adaptive quizzes with instant feedback
- 1v1 knowledge duels
- Weekly tournaments with rewards
- Smart flashcards and active recall
- Daily streaks and reminders
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Master any topic, and actually remember it. Most of what you read or watch fades within days. Fathomly makes knowledge stick. Pick any subject, from philosophy and history to neuroscience and finance, and Fathomly builds an interactive learning path broken down into bite sized, adaptive lessons. As you advance, questions adapt to your level so you are always challenged at the right depth. Backed by cognitive science: active recall and spaced repetition ensure long term retention. What you can do in Fathomly: • Interactive Courses on Any Topic: Learn complex subjects through step by step lessons with instant feedback and explanations when you get an answer wrong. • 1v1 Knowledge Duels: Put what you learn to the test by battling head to head in quiz matches. • Weekly Sunday Tournaments: Compete on the weekly leaderboard across three exam papers to win rewards and free Scholar access. • Smart Flashcards and Active Recall: High yield cards generated straight from your courses, scheduled just before you forget them. • Daily Streaks and Reminders: Build a daily learning habit with smart nudges to keep your streak alive. Fathomly Scholar Start with a 3 day free trial. Upgrade to Fathomly Scholar to unlock full courses, all tournament papers, and 1v1 duels: • Weekly: £2.99 / week (includes 3 day free trial) • Monthly: £8.99 / month • Yearly: £79.99 / year Payment is charged to your Apple ID upon confirmation of purchase. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store Account Settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tryfathomly.com/privacy
Kaja AI
This app transforms any topic into a personalized learning journey. It offers structured lessons, interactive exercises, quizzes, and flashcards to help users learn step-by-step. Users can track progress and build learning habits.
- Personalized learning journeys
- Interactive exercises and quizzes
- Flashcards and mini-games
- Progress tracking and daily streaks
- AI-powered explanations
- Structured lessons
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Learn anything with Kaja AI. Turn any topic you want to understand into a personalized learning journey built around you. Kaja creates structured courses with focused lessons, interactive exercises, quizzes, flashcards, and practical activities that help you learn step by step. LEARN YOUR WAY Choose what you want to learn and let Kaja create a course around your goal. Lessons are designed to break down complex topics into clear and manageable steps. INTERACTIVE LEARNING Learning is more than just reading. Practice what you learn with multiple-choice questions, written responses, matching activities, true or false questions, speaking exercises, practical tasks, and more. TEST YOUR KNOWLEDGE Mini tests throughout your course help reinforce important concepts. Complete the final exam to test your understanding of everything you have learned. FLASHCARDS AND MINI GAMES Review important ideas with flashcards and quick learning activities designed to help you remember what matters. ASK KAJA Need help with a lesson or concept? Ask Kaja for additional explanations and continue learning at your own pace. BUILD YOUR LEARNING HABIT Track your progress, build your daily streak, and make learning part of your routine. LEARN WHAT MATTERS TO YOU Whether you want to explore a new subject, understand a difficult concept, develop a new skill, or expand your knowledge, Kaja helps you move forward one lesson at a time. SUBSCRIPTION REQUIRED A Kaja Pro subscription is required to access Kaja. Kaja Pro includes up to 10 course generations per month. If you use all included course generations, additional course generations can be purchased separately through in-app purchases. Subscription pricing and purchase options are displayed in the app before purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Fathomly at 3.0 against Kaja AI's 2.0. Fathomly also leads on monetization model (freemium vs subscription) and device support (3 vs 1). Kaja AI's advantage is update cadence (every 4 days vs every 4 weeks). On price, ratings volume, 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
Both are free to download. Fathomly sells 3 in-app purchases, starting at $2.99 per 7 days and Kaja AI sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.
Fathomly holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 3 and 3 respectively.
Fathomly ships an update every 4 weeks, Kaja AI every 4 days. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.
| Parameter | Fathomly | Kaja AI |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (3 ratings) — better | 2.0 (3 ratings) |
| Number of ratings | 3 | 3 |
| Update frequency | Every 4 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium — better | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 12 MB | 69 MB |
| Age rating | 12+ | 4+ |
| Developer | jake green | Mans Lundblad |
In-app purchases
Fathomly
- Fathomly Scholar3 Days trial$2.997 Days
- Fathomly Scholar$9.991 Month
- Fathomly Scholar$79.991 Year
Kaja AI
- Kaja Pro$6.991 Month
- Kaja Pro Yearly$59.991 Year
- Extra Course$1.99









