Knowunity vs Lyn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Knowunity
This AI-powered learning companion helps students prepare for exams like SAT, ACT, and AP. It creates personalized study plans with flashcards, quizzes, and mock exams, and offers homework help by explaining problems step-by-step. Students can also access over a million shared notes and summaries from a collaborative community.
- Personalized daily study plans
- AI-powered homework explanations
- Flashcards and quizzes
- Mock exams with AI scoring
- Voice recall and tutor chat
- Community notes and summaries
- Gamified learning with XP and leagues
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Hey, I'm Knowie - your new way of learning. Whatever you're working on, I'll help you understand it, remember it, and walk into your next SAT, ACT, or AP feeling ready. 30 million students already study with me, I am created by the best students and the core tools are free. This is a the new way of learning - here is how we do it. Everything runs through one place: your exam plan. Instead of a pile of separate features, I pull it all together - flashcards, quizzes, summaries, mock exams, voice practice, and the official SAT, ACT, and AP guidelines - and structure it into a day-by-day plan built around your test date and your topics. Your exam plan, made with you. Tell me when your test is and what you need to cover, and I'll map out exactly what to do each day, with the right notes and flashcards for your course. Add your class timetable and I'll fit study around your lessons - no all-nighters. As the test gets closer the plan adapts, and you always see what you've got down and what's next. Study that actually sticks - active recall. Rereading feels productive but fades fast, so your plan is built around active recall: pulling answers out of your own memory. Quizzes and flashcards ask you to remember, not just recognize, and mastery tracking shows each topic move from shaky to solid. Just say it out loud. This is where voice comes in. With voice recall in your plan, you say your answer from memory and I check it with you - hands-free, out loud, the way real recall works. And in chat, switch on voice mode to talk to me like a tutor: ask anything, no typing needed. Stuck on homework? Snap a photo of any problem - math, chemistry, physics, biology - and I'll walk you through it step by step, so you get the how, not just the answer. Keep a separate chat for each class so nothing gets mixed up. Turn anything into study material. Upload PDFs, slides, photos, or handwritten notes, paste in text and links, bring your old flashcard decks, or drop in a YouTube video - I'll turn it into flashcards, quizzes, and clean summaries in seconds, ready to slot straight into your plan. Need vocab for a language class or a clearer essay outline? I've got you there too. Practice like it's the real thing. Take full, AI-scored mock exams in real SAT and AP format and see where you stand before test day - then I fold the results back into your plan, so you review exactly what needs work. Learn from real students. Browse over 1 million notes, summaries, and past-paper solutions shared by students in your subject and grade - right alongside everything we make together. Keep your streak going. Earn XP as you study, join a weekly league of up to 30 classmates, and climb from Bronze to Gold. A little friendly competition to keep you coming back. I'm built for every subject - AP courses, Math, Sciences, Social Studies, English, World Languages, Computing, and SAT and ACT prep. Whether you're cramming tonight or planning weeks ahead, we'll get you there - and the core tools are always free. Ready when you are. Download Knowunity, and let's study smarter, not harder. TOS: https://knowunity.com/legal/tos
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.
- 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
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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
Screenshots
Verdict
The clearest difference is ads: Lyn at none against Knowunity's shown. Lyn also leads on rating (5.0 vs 4.7) and review sentiment (100% vs 82%). Knowunity's advantage is update cadence (daily vs every 3 weeks) and ratings volume (13K vs 2). 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. Knowunity sells 9 in-app purchases, starting at $9.99 per 7 days and Lyn sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Lyn holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Knowunity has 13K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 82% of Knowunity's written reviews are positive against 100% of Lyn's.
Knowunity ships an update daily, Lyn every 3 weeks. The most recent releases landed on November 10, 2026 and November 4, 2026 respectively.
| Parameter | Knowunity | Lyn |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (13K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 82.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 13K — better | 2 |
| Update frequency | Daily — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #10 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 — better | 15.6 |
| Further details — not scored | ||
| Size | 259 MB | 90 MB |
| Age rating | 4+ | 4+ |
| Developer | Knowunity Inc. | Thuemmler AI GmbH |
Customer experience
Knowunity
Lyn
Bugs and requests
Knowunity
Reported bugs
4 issues- Frequent app crashes and freezes
- Issues with uploading and saving notes
- Problems with group chat functionality
- Inconsistent behavior when navigating the app
Requested features
4 requests- Add more advanced class options
- Improve search and organization of notes
- Implement a draft feature for creating study materials
- Add more customization options
Lyn
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Knowunity
- Knowunity Pro2 variants$9.997 Days
- Knowunity Pro$14.497 Days
- Knowunity Pro$14.991 Month
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- Knowunity Pro$15.991 Month
- Knowunity Pro$20.491 Month
- Knowunity Pro$42.491 Year
- Knowunity Pro1 Year trial$49.991 Year
- Knowunity Pro$49.991 Year
- Knowunity Pro$83.991 Year
Lyn
- Nachhilfe Mentor Pro7 Days trial$4.991 Month
- Nachhilfe Mentor Pro7 Days trial$6.991 Month
- Nachhilfe Mentor Pro7 Days trial$49.991 Year









