# SecureData Lock Admin vs PDF Locker

The clearest difference is update cadence: PDF Locker at every 2 weeks against SecureData Lock Admin's every 2 months. SecureData Lock Admin's advantage is iOS requirement (11.0 vs 15.0). 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.

SecureData Lock Admin ships an update every 2 months, PDF Locker every 2 weeks. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SecureData Lock Admin | PDF Locker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pdf-locker/id1595267349/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 32 MB | 6 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SecureData, Inc.](https://appshunter.io/developer/1204857940) | [Krishna Raj Salim](https://appshunter.io/developer/1638689285) |

## What reviewers say

### SecureData Lock Admin

[App page](https://appshunter.io/ios/app/securedata-lock-admin/id1469387327)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Locker

[App page](https://appshunter.io/ios/app/pdf-locker/id1595267349)

Secure your PDF documents with individual passwords or PINs. Share protected files and easily remove passwords when needed. Offers app-level protection using device biometrics or passcodes.

**Highlights:** Save PDF files, Secure with password/PIN, Share protected files, Unlock/remove password, App protection with biometrics/passcode

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

**In-app purchases:** none


## Frequently asked questions

### Is SecureData Lock Admin free?

SecureData Lock Admin is free to download, with no in-app purchases.

### Is PDF Locker free?

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

### Do SecureData Lock Admin or PDF Locker have ads?

Neither SecureData Lock Admin nor PDF Locker shows ads.

### Which is updated more often, SecureData Lock Admin or PDF Locker?

SecureData Lock Admin ships an update every 2 months, and PDF Locker every 2 weeks. Most recently, SecureData Lock Admin was updated on September 10, 2026 and PDF Locker on September 21, 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.*