# PDF Secure vs OneCrypt

The clearest difference is in-app purchases: PDF Secure at none against OneCrypt's 3. PDF Secure also leads on ads (none vs shown). OneCrypt's advantage is update cadence (every 9 days vs every 9 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OneCrypt sells 3 in-app purchases, starting at $0.99 per year. PDF Secure asks for nothing beyond the download.

PDF Secure ships an update every 9 months, OneCrypt every 9 days. The most recent releases landed on October 13, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | PDF Secure | OneCrypt |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (376 ratings)](https://appshunter.io/ios/app/pdf-secure/id1515466852/reviews)** | — |
| Number of ratings | **376** | — |
| Positive reviews | 98.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 1 MB | 31 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iSolid apps](https://appshunter.io/developer/1215383083) | [国材 苏](https://appshunter.io/developer/1227214050) |

## 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


### OneCrypt

[App page](https://appshunter.io/ios/app/onecrypt-encrypt-files/id6459055606)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Pro | $0.99 | per year |
| Monthly Pro | $0.99 | per month |
| Lifetime Pro | $2.99 | one-time |


## Frequently asked questions

### Is PDF Secure free?

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

### Is OneCrypt free?

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

### Do PDF Secure or OneCrypt have ads?

OneCrypt shows ads; PDF Secure does not.

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

PDF Secure ships an update every 9 months, and OneCrypt every 9 days. Most recently, PDF Secure was updated on October 13, 2026 and OneCrypt on October 4, 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.*