# BlackGSM vs StampDoc

The clearest difference is update cadence: StampDoc at every 2 months against BlackGSM's every 4 months. BlackGSM's advantage is iOS requirement (12.2 vs 15). On price, ads, in-app purchases and device support there is nothing between them.

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

BlackGSM ships an update every 4 months, StampDoc every 2 months. The most recent releases landed on October 4, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | BlackGSM | StampDoc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/stampdoc/id6753040013/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 8 MB | 67 MB |
| Requires iOS | **12.2** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TARIFER, OOO](https://appshunter.io/developer/1458842075) | [Anyelo Moreno](https://appshunter.io/developer/1842233376) |

## What reviewers say

### BlackGSM

[App page](https://appshunter.io/ios/app/blackgsm/id1596666294)

**Features:** macOS Compatibility

**In-app purchases:** none


### StampDoc

[App page](https://appshunter.io/ios/app/stampdoc/id6753040013)

Easily sign PDFs and images, create custom digital stamps, and manage your documents securely from your iPhone or iPad. Streamline your workflow by going fully digital, eliminating the need for printing and scanning.

**Highlights:** Sign PDFs and images, Create custom digital stamps, Signature editor and scanner, Import and reuse stamps, Built-in PDF and image viewer, Save and share signed files

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

**In-app purchases:** none


## Frequently asked questions

### Is BlackGSM free?

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

### Is StampDoc free?

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

### Do BlackGSM or StampDoc have ads?

Neither BlackGSM nor StampDoc shows ads.

### Which is updated more often, BlackGSM or StampDoc?

BlackGSM ships an update every 4 months, and StampDoc every 2 months. Most recently, BlackGSM was updated on October 4, 2026 and StampDoc on October 23, 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.*