# StampDoc vs Blitz Key

The clearest difference is device support: StampDoc at 3 against Blitz Key's 1. StampDoc also leads on iOS requirement (15 vs 18.0). On price, update cadence, 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.

StampDoc ships an update every 2 months, Blitz Key every 6 weeks. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | StampDoc | Blitz Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stampdoc/id6753040013/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 67 MB | 8 MB |
| Requires iOS | **15** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Anyelo Moreno](https://appshunter.io/developer/1842233376) | [REAK SOFT, OOO](https://appshunter.io/developer/1506483699) |

## What reviewers say

### 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

**In-app purchases:** none


### Blitz Key

[App page](https://appshunter.io/ios/app/blitz-key/id6759643409)

**In-app purchases:** none


## Frequently asked questions

### Is StampDoc free?

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

### Is Blitz Key free?

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

### Do StampDoc or Blitz Key have ads?

Neither StampDoc nor Blitz Key shows ads.

### Which is updated more often, StampDoc or Blitz Key?

StampDoc ships an update every 2 months, and Blitz Key every 6 weeks. Most recently, StampDoc was updated on October 4, 2026 and Blitz Key on October 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.*