# Zetta GPS vs ProStamp

The clearest difference is update cadence: ProStamp at every 3 days against Zetta GPS's every 5 weeks. Zetta GPS's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Zetta GPS ships an update every 5 weeks, ProStamp every 3 days. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Zetta GPS | ProStamp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prostamp-timestamp-camera/id6761140743/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Monetization | — | Free |
| Size | 46 MB | 20 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zetta Systems Limited](https://appshunter.io/developer/1044602043) | [Xiao Lang](https://appshunter.io/developer/1887985261) |

## What reviewers say

### Zetta GPS

[App page](https://appshunter.io/ios/app/zetta-gps/id1530159677)

**In-app purchases:** none


### ProStamp

[App page](https://appshunter.io/ios/app/prostamp-timestamp-camera/id6761140743)

This professional camera app automatically stamps photos and videos with essential job details like time, GPS, and weather. It creates verifiable proof of work with customizable watermarks and a built-in gallery for easy organization and sharing.

**Highlights:** Auto-stamp photos with time, GPS, and weather, Network-verified time for proof, Customizable watermarks with company logo, Built-in gallery with photo map, Batch sharing and PDF reports, Offline functionality with GPS

**In-app purchases:** none


## Frequently asked questions

### Is Zetta GPS free?

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

### Is ProStamp free?

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

### Do Zetta GPS or ProStamp have ads?

Neither Zetta GPS nor ProStamp shows ads.

### Which is updated more often, Zetta GPS or ProStamp?

Zetta GPS ships an update every 5 weeks, and ProStamp every 3 days. Most recently, Zetta GPS was updated on September 17, 2026 and ProStamp on September 9, 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.*