# Üben vs Calendar

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.

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.

## The numbers

| Metric | Üben | Calendar |
| --- | --- | --- |
| Price | **$0.99** | $31.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 29 months** | Every 31 months |
| Monetization | Paid | — |
| Size | 21 MB | 1 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [admaDIC Rainer Schwarze & Annett Schwarze GbR](https://appshunter.io/developer/553282875) | [Martin Eisele](https://appshunter.io/developer/1099492467) |

## What reviewers say

### Üben

[App page](https://appshunter.io/ios/app/uben-rounding/id979387759)

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.

**Highlights:** Number rounding practice, Numbers up to 1,000,000, Simple and easy to use, Random task generation, Ideal for children

**Features:** Vision Pro support

**In-app purchases:** none


### Calendar

[App page](https://appshunter.io/ios/app/calendar-trainer/id1293920342)

**In-app purchases:** none


## Frequently asked questions

### Is Üben free?

Üben costs $0.99, with no in-app purchases.

### Is Calendar free?

Calendar costs $31.99, with no in-app purchases.

### Do Üben or Calendar have ads?

Neither Üben nor Calendar shows ads.

### Which is updated more often, Üben or Calendar?

Üben ships an update every 29 months, and Calendar every 31 months. Most recently, Üben was updated on October 8, 2026 and Calendar on October 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*