Rechentrainer vs Why?!
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Rechentrainer
This app offers personalized math practice for all ages, covering addition, subtraction, multiplication, and division. It features customizable difficulty levels, motivational rewards, and progress tracking to make learning enjoyable and effective.
- Personalized arithmetic practice
- Customizable difficulty levels
- Motivational reward system
- Learning progress tracking
- Suitable for all ages
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Math Trainer: Master Mathematics with Fun! - Personalized Learning: Practice all four basic arithmetic operations (addition, subtraction, multiplication, division) at your own pace. - Customizable Difficulty Levels: Choose numbers before and after the operator for tailored exercises β perfect for every age and skill level. - Motivation through Rewards: Earn smiley points for every correct answer and boost your learning motivation. - Track Learning Progress: Keep an eye on your progress, strengths, and areas for improvement with the learning history overview. - For Young and Old: Whether a student or adult, the Math Trainer is intended for anyone who wants to improve their math skills. - Learn through Play: Turn learning into an exciting game and master mathematics with fun and joy. Discover now how learning math can be fun β with the Math Trainer!
Why?!
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Why?! is the safe digital knowledge companion for children aged 4 to 16. With a lovingly animated animal character as their guide, your children can ask all their questions β anything that comes to mind. The app grows with your child and automatically adapts answers to their respective age. The App That Grows With Your Child From preschool to adolescence, Why?! accompanies your children on their journey of discovery. Younger ones can simply ask their questions by voice β even if they can't read yet. As soon as your child starts learning to read, text is additionally displayed. For older children from about 10 years old, the app offers a complete chat interface as a safe alternative to uncontrolled AI tools. This way, your children get exactly the support they need at their respective developmental stage. Playful Learning With the Bottles & Glasses System Children learn not only knowledge, but also conscious resource management. Each week they receive a "knowledge bottle" that they can distribute over seven days. This makes the abstract use of AI tangible and playfully teaches that resources are valuable. A lovingly animated fox accompanies every interaction and makes learning a joyful experience. Does the learning companion become a friend? No. Why?! transparently teaches children that it's an AI β a learning tool without feelings. This honesty promotes a healthy relationship with technology. Real friendships are formed with people. Perfectly Designed for Families You can create up to five child profiles and make individual settings for each child. The app shows you which topics particularly interest your children β without seeing the conversations themselves. You get valuable insights and conversation starters while your children's privacy remains protected. This relieves you from the many "Why?" questions of daily life while giving you the assurance that your children are safely interacting with AI. Security You Can Rely On Full control remains with you: You decide which of the 15 topic areas may be discussed. The adult area is PIN-protected, so only you can change the settings. This way you can be sure that your children are learning in a protected environment. Privacy is not an option for Why?!, but a standard. We minimize data storage to the essentials, use European servers, and comply with COPPA and GDPR guidelines for childrenβs applications. Flexible Subscriptions for Every Family Test Why?! in the first month at a heavily discounted price and then decide which subscription fits your family. The monthly or annual subscriptions are tiered by number of children β from one to five children. Why?! turns childhood curiosity into a safe learning experience β developed by parents for parents. Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Rechentrainer at none against Why?!'s 10. Rechentrainer also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Why?! sells 10 in-app purchases, starting at $7.99 per month. Rechentrainer asks for nothing beyond the download.
Rechentrainer ships an update every 2 months, Why?! monthly. The most recent releases landed on June 4, 2026 and September 19, 2026 respectively.
| Parameter | Rechentrainer | Why?! |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | β |
| Update frequency | Every 2 months | Monthly β better |
| Ads | No β better | Yes |
| In-app purchases | No β better | Yes |
| Monetization | Free | β |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.2 β better | 15.1 |
| Further details β not scored | ||
| Size | 7 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Nicolai Kummer | Looking4Cache UG (haftungsbeschraenkt) |
In-app purchases
Rechentrainer
No in-app purchases
Why?!
- 1 Kid / Month1 Month trial$7.991 Month
- 2 Kids / Month1 Month trial$11.991 Month
- 3 Kids / Month1 Month trial$14.991 Month
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- 4 Kids / Month$17.991 Month
- 5 Kids / Month1 Month trial$19.991 Month
- 1 Kid / Year$59.991 Year
- 2 Kids / Year$89.991 Year
- 3 Kids / Year$109.991 Year
- 4 Kids / Year$129.991 Year
- 5 Kids / Year$149.991 Year









