# UnlockScrewPuzzle vs AltiStamp

The clearest difference is in-app purchases: UnlockScrewPuzzle at none against AltiStamp's 3. UnlockScrewPuzzle also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AltiStamp sells 3 in-app purchases, starting at $4.99 per month. UnlockScrewPuzzle asks for nothing beyond the download.

UnlockScrewPuzzle ships an update every 3 weeks, AltiStamp every 2 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | UnlockScrewPuzzle | AltiStamp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/altistamp-camera/id6748038454/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 27 MB | 54 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [鹏飞 侯](https://appshunter.io/developer/1553207112) | [群 彭](https://appshunter.io/developer/1823569294) |

## What reviewers say

### UnlockScrewPuzzle

[App page](https://appshunter.io/ios/app/unlockscrewpuzzle/id6499340591)

**Features:** macOS Compatibility

**In-app purchases:** none


### AltiStamp

[App page](https://appshunter.io/ios/app/altistamp-camera/id6748038454)

Capture photos with real-time altitude, location, and time overlays. This app is ideal for outdoor activities like hiking and climbing, providing weather and UV ray information on your images.

**Highlights:** Real-time altitude recording, Photo overlays with altitude and location, Weather and UV ray information, Suitable for outdoor activities, Seamless puzzle integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $17.99 | per year |
| Lifetime Premium | $16.00 | one-time |


## Frequently asked questions

### Is UnlockScrewPuzzle free?

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

### Is AltiStamp free?

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

### Do UnlockScrewPuzzle or AltiStamp have ads?

Neither UnlockScrewPuzzle nor AltiStamp shows ads.

### Which is updated more often, UnlockScrewPuzzle or AltiStamp?

UnlockScrewPuzzle ships an update every 3 weeks, and AltiStamp every 2 weeks. Most recently, UnlockScrewPuzzle was updated on October 25, 2026 and AltiStamp on October 30, 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.*