Comparison

Lyn vs Kotobot

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

Head to head
About

Lyn

This AI-powered tutor provides instant help with school subjects, homework, and exam preparation. It offers step-by-step explanations, transforms study materials into flashcards, and includes a voice mentor for interactive learning.

Highlights
  • AI tutor for all school subjects
  • Homework assistance and explanation
  • Convert study materials to flashcards
  • Voice mentor and language practice
  • Spaced repetition flashcards
  • Personalized learning projects
Features
Read full description

Nachhilfe Mentor is your personal AI tutor for school, homework, and exam prep. Learn faster, understand tough topics, and get instant help whenever you're stuck. Whether it's math, English, chemistry, history, or foreign languages: Nachhilfe Mentor helps students from grade 5 and up solve homework, understand new material, and prepare for tests, quizzes, and final exams. With AI tutoring, you learn exactly when you need help. No waiting. No pressure. Right on your iPhone. What Nachhilfe Mentor can do: - AI Tutor for every subject Ask questions in math, English, chemistry, physics, history, and more. Get clear, step-by-step explanations you actually understand. - Homework help that teaches, not just answers Snap a photo of your homework, upload a PDF, or type your question directly into the app. Nachhilfe Mentor doesn't just give you the answer, it walks you through how to get there. - Turn PDFs and notes into study material Upload your class notes or textbook pages and instantly turn them into flashcards, summaries, and practice tests. Perfect for reviewing before a quiz or exam. - Voice Mentor and language coach Talk to your AI tutor out loud. Ask questions, practice explanations, or train a new language like Spanish, French, Italian, or German. - Flashcards with spaced repetition Study with a smart flashcard maker that repeats the hardest topics more often, so information actually sticks. - Personal study plans Build a study plan for a subject, topic, or upcoming exam. The app keeps you on track and helps you make steady progress, step by step. Nachhilfe Mentor is built for students, college students, and anyone who wants to study smarter. The app combines an AI tutor, homework helper, flashcard maker, study planner, and language coach in a single study app. Start for free and learn today with your personal AI Nachhilfe Mentor. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://nachhilfe-mentor.de/privacy-policy

About

Kotobot

Master Japanese and Chinese vocabulary with contextual learning and spaced repetition. Focus on real sentences, native audio, and illustrations to ensure long-term retention without the hassle of creating your own study materials.

Highlights
  • Learn vocabulary in context
  • Native speaker audio
  • Illustrations for meaning
  • Spaced repetition algorithm
  • Multiple card types
  • Curated vocabulary paths
Features
Read full description

Kotobot helps you learn vocabulary in Japanese and Chinese and actually remember it. Most apps teach you words you forget a week later. Kotobot teaches every word in context, real sentences, native audio, and images, then brings it back for review right before you'd forget it. No deck-building, no busywork. Just open the app and review what's due. EVERY WORD COMES WITH CONTEXT • Real example sentences, not word = translation pairs • Native-speaker audio for every sentence • Illustrations that anchor the meaning • Tap any word in a sentence for an instant grammar breakdown REVIEWS THAT ACTUALLY STICK • A spaced repetition algorithm schedules each review at the perfect time • Multiple card types — listening, reading, and recall — train different skills with the same word • Fresh sentences keep words from going stale, so you learn the word, not the card NO SETUP, NO GUESSWORK • Curated vocabulary paths take you from beginner onward, no wondering what to study next • Cards are ready-made with audio, images, and examples, so there's nothing to build • Pick up right where you left off, even after a break WHO IT'S FOR If you've done the streaks and the lessons but still can't read a menu, or you know Anki works but making good cards feels like a second job, Kotobot is the middle path: the retention of spaced repetition with none of the setup, and context-rich cards that feel closer to real immersion. Download Kotobot and start learning vocabulary that sticks. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Kotobot Terms: https://kotobotapp.com/terms Privacy Policy: https://kotobotapp.com/privacy

Screenshots

Lyn4 screens
Kotobot4 screens

Verdict

The call

Lyn and Kotobot are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Lyn sells 3 in-app purchases, starting at $4.99 per month and Kotobot sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Lyn against 5.0 for Kotobot. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Lyn ships an update every 3 weeks, Kotobot fortnightly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

ScorecardNo meaningful differences
Lyn versus Kotobot: the parameters behind the verdict, then further details
ParameterLynKotobot
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size90 MB50 MB
Age rating4+4+
DeveloperThuemmler AI GmbHEvan Li

In-app purchases

3 purchases

Lyn

Subscriptions3
  • Nachhilfe Mentor Pro7 Days trial$4.991 Month
  • Nachhilfe Mentor Pro7 Days trial$6.991 Month
  • Nachhilfe Mentor Pro7 Days trial$49.991 Year
2 purchases

Kotobot

Subscriptions2
  • Kotobot Pro Monthly7 Days trial$14.991 Month
  • Kotobot Pro Yearly7 Days trial$83.991 Year

Questions

Is Lyn free?
Lyn is free to download, with in-app purchases available.
Is Kotobot free?
Kotobot is free to download, with in-app purchases available.
Which has better reviews, Lyn or Kotobot?
Lyn and Kotobot are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Lyn or Kotobot have ads?
Neither Lyn nor Kotobot shows ads.
Which is updated more often, Lyn or Kotobot?
Lyn ships an update every 3 weeks, and Kotobot fortnightly. Most recently, Lyn was updated on November 4, 2026 and Kotobot on October 31, 2026.

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