# PDF Key vs PDF Lock

The clearest difference is in-app purchases: PDF Key at none against PDF Lock's 2. PDF Lock's advantage is ads (none vs shown) and update cadence (fortnightly vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Lock sells 2 in-app purchases, starting at $0.99 per month. PDF Key asks for nothing beyond the download.

PDF Key ships an update monthly, PDF Lock fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | PDF Key | PDF Lock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Fortnightly** |
| Size | 5 MB | 17 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Riku Kanai](https://appshunter.io/developer/6779163817) | [Nikunj Gondaliya](https://appshunter.io/developer/6789138441) |

## What reviewers say

### PDF Key

[App page](https://appshunter.io/ios/app/pdf-key/id6782367129)

**Features:** Vision Pro support

**In-app purchases:** none


### PDF Lock

[App page](https://appshunter.io/ios/app/pdf-lock-unlock-and-protect/id6789138439)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly - PDF Lock & Unlock Pro | $0.99 | per month |
| Yearly - PDF Lock & Unlock Pro | $7.99 | per year |


## Frequently asked questions

### Is PDF Key free?

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

### Is PDF Lock free?

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

### Do PDF Key or PDF Lock have ads?

PDF Key shows ads; PDF Lock does not.

### Which is updated more often, PDF Key or PDF Lock?

PDF Key ships an update monthly, and PDF Lock fortnightly. Most recently, PDF Key was updated on October 25, 2026 and PDF Lock on October 25, 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.*