# Ustar Mobile vs Contraction Timer

The clearest difference is in-app purchases: Ustar Mobile at none against Contraction Timer's 1. Ustar Mobile also leads on iOS requirement (10.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Contraction Timer sells 1 one-off in-app purchase. Ustar Mobile asks for nothing beyond the download.

Ustar Mobile ships an update every 5 weeks, Contraction Timer every 3 weeks. The most recent releases landed on September 30, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Ustar Mobile | Contraction Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 34 MB | 3 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [杭州宇泛智能科技有限公司](https://appshunter.io/developer/1156327327) | [SALEH MUSTAFA](https://appshunter.io/developer/1875062603) |

## What reviewers say

### Ustar Mobile

[App page](https://appshunter.io/ios/app/ustar-mobile/id1565295845)

**Features:** macOS Compatibility

**In-app purchases:** none


### Contraction Timer

[App page](https://appshunter.io/ios/app/contraction-timer-wavely/id6759206862)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wavely Premium | $2.99 | one-time |


## Frequently asked questions

### Is Ustar Mobile free?

Ustar Mobile is free to download, with no in-app purchases.

### Is Contraction Timer free?

Contraction Timer is free to download, with in-app purchases available.

### Do Ustar Mobile or Contraction Timer have ads?

Neither Ustar Mobile nor Contraction Timer shows ads.

### Which is updated more often, Ustar Mobile or Contraction Timer?

Ustar Mobile ships an update every 5 weeks, and Contraction Timer every 3 weeks. Most recently, Ustar Mobile was updated on September 30, 2026 and Contraction Timer on September 27, 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.*