Üben vs Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Üben
Practice rounding numbers between 1 and 1,000,000 with this straightforward educational tool. Its simple design makes it ideal for children to easily grasp and practice mathematical concepts.
- Number rounding practice
- Numbers up to 1,000,000
- Simple and easy to use
- Random task generation
- Ideal for children
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"Üben Rounding" lets you practice rounding for numbers between 1 and 1'000'000. The app is designed to be as simple as possible. This is great for children as it is super easy to use. The app generates a random task with a number from 1 to 1'000'000 to be rounded.
Calendar
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Supported Languages: German and English With this app you can train your ability to calculate a weekday for any given date. It offers a great variety of training methods. This app also gives you an overview of my method/simplification on how the algorithm works and how you can calculate it in your head.
Screenshots
Verdict
The clearest difference is price: Üben at $0.99 against Calendar's $31.99. Üben also leads on iOS requirement (12.0 vs 15.6). On update cadence, ads, in-app purchases 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
Üben costs $0.99 and Calendar $31.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Üben ships an update every 29 months, Calendar every 31 months. The most recent releases landed on October 8, 2026 and October 18, 2026 respectively.
| Parameter | Üben | Calendar |
|---|---|---|
| Price | $0.99 — better | $31.99 |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 29 months — better | Every 31 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 21 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | admaDIC Rainer Schwarze & Annett Schwarze GbR | Martin Eisele |
In-app purchases
Üben
No in-app purchases
Calendar
No in-app purchases
