# PDF Studio vs Sign Docs

The clearest difference is device support: PDF Studio at 3 against Sign Docs's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PDF Studio sells 2 in-app purchases, starting at $9.99 per year and Sign Docs sells 4 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

PDF Studio ships an update every 9 days, Sign Docs every 3 weeks. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | PDF Studio | Sign Docs |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Size | 18 MB | 16 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Birkan Aksoy](https://appshunter.io/developer/1626910993) | [Andrei Alferchyk](https://appshunter.io/developer/1857457277) |

## What reviewers say

### PDF Studio

[App page](https://appshunter.io/ios/app/pdf-studio-reader-and-tools/id6781038759)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Studio Pro | $9.99 | per year |
| PDF Studio Pro (Lifetime) | $24.99 | one-time |


### Sign Docs

[App page](https://appshunter.io/ios/app/sign-docs-scan-to-pdf-and-esign/id6807106733)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $5.99 | per 7 days |
| Pro Monthly | $12.99 | per month |
| Pro Yearly | $49.99 | per year |
| One Document | $1.99 | one-time |


## Frequently asked questions

### Is PDF Studio free?

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

### Is Sign Docs free?

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

### Do PDF Studio or Sign Docs have ads?

Neither PDF Studio nor Sign Docs shows ads.

### Which is updated more often, PDF Studio or Sign Docs?

PDF Studio ships an update every 9 days, and Sign Docs every 3 weeks. Most recently, PDF Studio was updated on November 5, 2026 and Sign Docs on November 6, 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.*