# PDF Secure vs PDF Lock

The clearest difference is in-app purchases: PDF Secure at none against PDF Lock's 2. PDF Secure also leads on iOS requirement (13.0 vs 17.6). PDF Lock's advantage is update cadence (fortnightly vs every 9 months). On price, ads and device support there is nothing between them.

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

PDF Secure ships an update every 9 months, PDF Lock fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | PDF Secure | PDF Lock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (383 ratings)](https://appshunter.io/ios/app/pdf-secure/id1515466852/reviews)** | — |
| Number of ratings | **383** | — |
| Positive reviews | 98.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 1 MB | 17 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [iSolid apps](https://appshunter.io/developer/1215383083) | [Nikunj Gondaliya](https://appshunter.io/developer/6789138441) |

## What reviewers say

### PDF Secure

[App page](https://appshunter.io/ios/app/pdf-secure/id1515466852)

Secure your PDF documents by adding password protection, ensuring they cannot be opened without authorization. You can also easily remove existing password protection from your files. This app offers a straightforward process for safeguarding your sensitive information.

**Highlights:** Password protect PDF documents, Remove PDF password protection, Cross-platform compatibility, Export to various locations, Dark mode 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 Secure free?

PDF Secure 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 Secure or PDF Lock have ads?

Neither PDF Secure nor PDF Lock shows ads.

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

PDF Secure ships an update every 9 months, and PDF Lock fortnightly. Most recently, PDF Secure 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.*