# PDF Master vs AI Security

The clearest difference is review sentiment: AI Security at 49% against PDF Master's 9%. AI Security also leads on ads (none vs shown) and ratings volume (9.5K vs 200). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. PDF Master sells 12 in-app purchases, starting at $0.99 per 7 days and AI Security sells 12 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AI Security holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: AI Security has 9.5K ratings behind it against 200, so its average is the more settled of the two. Written reviews point the same way: 9% of PDF Master's written reviews are positive against 49% of AI Security's.

PDF Master ships an update every 2 weeks, AI Security every 3 weeks. The most recent releases landed on September 27, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | PDF Master | AI Security |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (200 ratings)](https://appshunter.io/ios/app/pdf-master-editor-reader/id6471487318/reviews) | **[4.5 (9.5K ratings)](https://appshunter.io/ios/app/ai-security-storage-privacy/id6479976058/reviews)** |
| Number of ratings | 200 | **9.5K** |
| Positive reviews | 9.1% of reviews | **49.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Subscription | Subscription |
| Size | 119 MB | 151 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CheeseJoy Apps](https://appshunter.io/developer/1727983156) | [Magic Snail](https://appshunter.io/developer/1758662275) |

## What reviewers say

### PDF Master

[App page](https://appshunter.io/ios/app/pdf-master-editor-reader/id6471487318)

This app offers a comprehensive suite of tools for managing PDF documents on iOS. It allows users to scan physical documents and gallery images into PDFs, create new PDFs from scratch, view existing files, merge multiple PDFs, and extract text using OCR technology.

**Highlights:** Scan photos to PDF, Convert gallery images to PDF, Create new PDF files, View and read PDF documents, Merge multiple PDF files, OCR text recognition

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Master | $0.99 | per 7 days |
| weekly | $4.99 | per 7 days |
| PDF Master PRO 1 Week | $5.99 | per 7 days |
| PDF Master PRO 1 Week | $5.99 | per 7 days |
| PDF Master PRO 1 Week | $5.99 | per 7 days |
| PDF Master PRO 1 Week | $9.99 | per 7 days |
| PDF Master PRO 1 Week | $9.99 | per 7 days |
| Monthly Pro | $9.99 | per month |
| PDF Master PRO 1 Year | $29.99 | per year |
| PDF Master PRO 1 Year | $34.99 | per year |
| PDF Master PRO 1 Year | $39.99 | per year |
| PDF Master Pro | $19.99 | one-time |


### AI Security

[App page](https://appshunter.io/ios/app/ai-security-storage-privacy/id6479976058)

This app offers a suite of tools to protect your phone and privacy. It includes a secure browser, device security checks, Wi-Fi safety evaluation, ad blocker, private vault, and phone cleaner to free up storage space.

**Highlights:** Secure Browser, Device Security Check, Wi-Fi Safety Evaluation, Duplicate Photo & Video Cleaner, Private Vault, Ad Blocker

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Security Pro 1 Week | $5.99 | per 7 days |
| AI Security Pro 1 Week | $5.99 | per 7 days |
| AI Security Pro 1 Week | $6.99 | per 7 days |
| AI Security Pro 1 Week | $9.99 | per 7 days |
| AI Security Pro 1 Month | $9.99 | per month |
| AI Security Pro 1 Week | $9.99 | per 7 days |
| AI Security Pro 1 Week | $12.99 | per 7 days |
| AI Security Pro 1 Week | $12.99 | per 7 days |
| AI Security Pro 1 Year | $29.99 | per year |
| AI Security Pro 1 Year | $34.99 | per year |
| AI Security Pro 1 Year | $39.99 | per year |
| AI Security Pro Permanent | $19.99 | one-time |

**What reviewers like**

- 🚀 Quick and easy to use
- 👍 Helpful for cleaning up photos and storage
- 🔒 Provides security and privacy features

**What reviewers complain about**

- 🚫 Not actually free, has hidden subscription fees
- 🤥 Misleading advertising about being free
- 💰 Expensive subscription costs
- 🤔 Unclear about what the app actually does

**Reported bugs**

- Accidentally deleting important photos and files
- App reverting user settings and choices
- Compatibility issues with older devices

**Requested features**

- More transparency about pricing and features
- Better explanation of how the app works
- Option to selectively clean files instead of bulk deletion


## Frequently asked questions

### Is PDF Master free?

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

### Is AI Security free?

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

### Which has better reviews, PDF Master or AI Security?

AI Security is rated higher. PDF Master averages 4.3 out of 5 from 200 ratings, while AI Security averages 4.5 from 9.5K ratings.

### Do PDF Master or AI Security have ads?

PDF Master shows ads; AI Security does not.

### Which is updated more often, PDF Master or AI Security?

PDF Master ships an update every 2 weeks, and AI Security every 3 weeks. Most recently, PDF Master was updated on September 27, 2026 and AI Security on October 1, 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.*