# PDF Compare & AI Detector vs Diff Checker

The clearest difference is iOS requirement: Diff Checker at 13.0 against PDF Compare & AI Detector's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PDF Compare & AI Detector sells 3 in-app purchases, starting at $1.99 per 7 days and Diff Checker sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Compare & AI Detector ships an update every 3 weeks, Diff Checker fortnightly. The most recent releases landed on September 20, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | PDF Compare & AI Detector | Diff Checker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pdf-compare-and-ai-detector/id6751617829/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 79 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, iPod, Mac** |
| Age rating | 12+ | 4+ |
| Developer | [Marsel Tagaev](https://appshunter.io/developer/1832147875) | [Edusoft Limited](https://appshunter.io/developer/1836364875) |

## What reviewers say

### PDF Compare & AI Detector

[App page](https://appshunter.io/ios/app/pdf-compare-and-ai-detector/id6751617829)

Quickly identify discrepancies between documents and text files. Features synced scrolling, color-coded changes, and a similarity score to streamline reviews of contracts, reports, and AI-generated content. Offers detailed PDF analysis and report generation.

**Highlights:** Fast text/PDF comparison, Color-highlight additions & deletions, Similarity score (percentage), PDF analysis: metadata, content, style, Detect missing text layers and scanned PDFs, Generate and share PDF analysis report

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly PRO Subscription | $1.99 | per 7 days |
| Monthly PRO Subscription | $3.99 | per month |
| Annual PRO Subscription | $19.99 | per year |


### Diff Checker

[App page](https://appshunter.io/ios/app/diff-checker-compare-text/id6753902567)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription Monthly | $7.99 | per month |
| Premium Subscription Yearly | $49.99 | per year |


## Frequently asked questions

### Is PDF Compare & AI Detector free?

PDF Compare & AI Detector is free to download, with in-app purchases available.

### Is Diff Checker free?

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

### Do PDF Compare & AI Detector or Diff Checker have ads?

Neither PDF Compare & AI Detector nor Diff Checker shows ads.

### Which is updated more often, PDF Compare & AI Detector or Diff Checker?

PDF Compare & AI Detector ships an update every 3 weeks, and Diff Checker fortnightly. Most recently, PDF Compare & AI Detector was updated on September 20, 2026 and Diff Checker on May 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.*