# PrimeThink vs PDF Pro

The clearest difference is update cadence: PrimeThink at every 3 weeks against PDF Pro's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PrimeThink ships an update every 3 weeks, PDF Pro every 4 months. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PrimeThink | PDF Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Size | 67 MB | 74 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Novaware Ltd](https://appshunter.io/developer/1502285848) | [MBDTECH LTD](https://appshunter.io/developer/1817225204) |

## What reviewers say

### PrimeThink

[App page](https://appshunter.io/ios/app/primethink/id6744278915)

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

**In-app purchases:** none


### PDF Pro

[App page](https://appshunter.io/ios/app/pdf-pro-scan-and-ocr/id6771667648)

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

**In-app purchases:** none


## Frequently asked questions

### Is PrimeThink free?

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

### Is PDF Pro free?

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

### Do PrimeThink or PDF Pro have ads?

Neither PrimeThink nor PDF Pro shows ads.

### Which is updated more often, PrimeThink or PDF Pro?

PrimeThink ships an update every 3 weeks, and PDF Pro every 4 months. Most recently, PrimeThink was updated on October 13, 2026 and PDF Pro on October 8, 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.*