Comparison

Lyn vs Planetary Atlas

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

Planetary Atlas

Explore detailed 3D models of planets, moons, and asteroids. Zoom from a solar system overview down to individual craters, with all features accurately named. Measure distances and compare celestial bodies.

Highlights
  • Interactive 3D planetary models
  • Zoomable from solar system to crater level
  • Accurate naming of celestial features
  • Measurement tools for distances
  • Comparison of celestial body sizes
  • Offline exploration of mapped worlds
Features
Read full description

Planetary Atlas turns open planetary-science imagery into an atlas you can fly through. Start at the whole solar system, pick a world, and pinch your way down from the full globe to a single crater floor — with the name of everything you pass. FOURTEEN WORLDS Four planets, seven moons, Ceres and two asteroids. 829 imagery layers and 15,025 named features, all built from open data published by NASA, the USGS and the mission teams who gathered it. SEE THE REAL SURFACE Every world is assembled from the actual spacecraft mosaics — Lunar Reconnaissance Orbiter at the Moon, the Mars Reconnaissance Orbiter and Viking at Mars, Cassini out at Saturn's moons. Where a mission mapped a place in detail, you can keep zooming until you are looking at metres per pixel. NAMED FEATURES Craters, maria, valleys, ridges, plains and landing sites, labelled with the names the International Astronomical Union gave them. Search for one, or just wander until something catches your eye. MEASURE THINGS Draw across a crater to get its width. Compare a canyon on Mars against one you already know on Earth. A to-scale view sets the worlds side by side at their true relative sizes, which is the fastest way to feel how small Ceres is and how far Jupiter's moons outrun our own. BUILT FOR CURIOSITY No account. No feed. No advertising. The atlas opens where you left it and gets out of the way. THE MOON IS FREE Explore the entire Moon — every layer, every named feature, the full set of tools — without paying anything. Atlas Pro opens the other thirteen worlds. ATLAS PRO A subscription unlocks all 14 worlds and every tool, available monthly or yearly, or as a one-time lifetime purchase. Family Sharing is supported on all three. Terms of Use (EULA): https://planetatlas.org/terms Privacy Policy: https://planetatlas.org/privacy Questions, corrections, or a feature you want mapped: hello@planetatlas.org

Screenshots

Lyn4 screens
Planetary Atlas4 screens

Verdict

The call

Lyn and Planetary Atlas are too close to call on the numbers: across 8 compared parameters — price, rating, ratings volume and ads 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 Planetary Atlas sells 3 in-app purchases, starting at $1.99 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 Planetary Atlas. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

ScorecardNo meaningful differences
Lyn versus Planetary Atlas: the parameters behind the verdict, then further details
ParameterLynPlanetary Atlas
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size90 MB64 MB
Age rating4+4+
DeveloperThuemmler AI GmbHAaron Hughes

Customer experience

Lyn

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Planetary Atlas

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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
3 purchases

Planetary Atlas

Subscriptions2
  • Atlas Pro Monthly$1.991 Month
  • Atlas Pro Yearly$12.991 Year
One-time1
  • Atlas Pro Lifetime$29.99

Questions

Is Lyn free?
Lyn is free to download, with in-app purchases available.
Is Planetary Atlas free?
Planetary Atlas is free to download, with in-app purchases available.
Which has better reviews, Lyn or Planetary Atlas?
Lyn and Planetary Atlas are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Lyn or Planetary Atlas have ads?
Neither Lyn nor Planetary Atlas shows ads.

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