# Similar Basic vs PDF Compare & AI Detector

The clearest difference is iOS requirement: Similar Basic at 15.0 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. Similar Basic sells 1 one-off in-app purchase and PDF Compare & AI Detector sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on May 17, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Similar Basic | PDF Compare & AI Detector |
| --- | --- | --- |
| 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 | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 23 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 12+ |
| Developer | [Thinkwider CO., LTD.](https://appshunter.io/developer/1637233894) | [Marsel Tagaev](https://appshunter.io/developer/1832147875) |

## What reviewers say

### Similar Basic

[App page](https://appshunter.io/ios/app/similar-basic/id6476169731)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multi-clipboard Storage | $13.99 | one-time |


### 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 |


## Frequently asked questions

### Is Similar Basic free?

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

### Is PDF Compare & AI Detector free?

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

### Do Similar Basic or PDF Compare & AI Detector have ads?

Neither Similar Basic nor PDF Compare & AI Detector shows ads.

### Which is updated more often, Similar Basic or PDF Compare & AI Detector?

Similar Basic ships an update every 3 weeks, and PDF Compare & AI Detector every 3 weeks. Most recently, Similar Basic was updated on May 17, 2026 and PDF Compare & AI Detector on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*