# DD Lock vs PDF Reader

The clearest difference is in-app purchases: DD Lock at none against PDF Reader's 11. DD Lock also leads on ads (none vs shown) and iOS requirement (9.0 vs 17.6). On price, update cadence and device support there is nothing between them.

Both are free to download. PDF Reader sells 9 in-app purchases, starting at $3.99 per 7 days. DD Lock asks for nothing beyond the download.

DD Lock ships an update fortnightly, PDF Reader every 8 days. The most recent releases landed on September 29, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | DD Lock | PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (665 ratings)](https://appshunter.io/ios/app/pdf-reader-editor-and-scanner/id6739480825/reviews)** |
| Number of ratings | — | **665** |
| Positive reviews | — | 37.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 118 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SMARTCHIP MICROELECTRONICS CORP.](https://appshunter.io/developer/872823142) | [DAOWEI NETWORK TECHNOLOGY PTE.LTD.](https://appshunter.io/developer/1547755677) |

## What reviewers say

### DD Lock

[App page](https://appshunter.io/ios/app/dd-lock/id1459621582)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-editor-and-scanner/id6739480825)

This app provides comprehensive PDF management, including reading, editing, and scanning. It uses AI for intelligent document recognition, summarization, and conversion to various formats. Securely store and access your files in the cloud or from popular services.

**Highlights:** AI-powered PDF editing and summarization, Intelligent document scanning with OCR, Convert between PDF and other file formats, Annotate, sign, and fill PDF forms, Cloud storage integration (Google Drive, OneDrive), Merge, split, lock, and compress PDFs

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Week | $3.99 | per 7 days |
| One Week | $3.99 | per 7 days |
| One Week | $7.99 | per 7 days |
| One Week | $7.99 | per 7 days |
| One Month | $12.99 | per month |
| One Year | $49.99 | per year |
| One Year | $76.99 | per year |
| One Year | $76.99 | per year |
| Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is DD Lock free?

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

### Is PDF Reader free?

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

### Do DD Lock or PDF Reader have ads?

PDF Reader shows ads; DD Lock does not.

### Which is updated more often, DD Lock or PDF Reader?

DD Lock ships an update fortnightly, and PDF Reader every 8 days. Most recently, DD Lock was updated on September 29, 2026 and PDF Reader on October 16, 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.*