# PDFIX vs AI Writing & Study Assistant

The clearest difference is in-app purchases: PDFIX at none against AI Writing & Study Assistant's 3. PDFIX also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AI Writing & Study Assistant sells 3 in-app purchases, starting at $4.99 per 7 days. PDFIX asks for nothing beyond the download.

PDFIX ships an update fortnightly, AI Writing & Study Assistant every 3 weeks. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | PDFIX | AI Writing & Study Assistant |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Size | 67 MB | 14 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Mauritz Jarl Software House LLC](https://appshunter.io/developer/1474194996) | [Zain UL Abideen](https://appshunter.io/developer/1838321736) |

## What reviewers say

### PDFIX

[App page](https://appshunter.io/ios/app/pdfix/id6741908625)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Writing & Study Assistant

[App page](https://appshunter.io/ios/app/ai-writing-and-study-assistant/id6755840893)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $39.99 | per year |


## Frequently asked questions

### Is PDFIX free?

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

### Is AI Writing & Study Assistant free?

AI Writing & Study Assistant is free to download, with in-app purchases available.

### Do PDFIX or AI Writing & Study Assistant have ads?

Neither PDFIX nor AI Writing & Study Assistant shows ads.

### Which is updated more often, PDFIX or AI Writing & Study Assistant?

PDFIX ships an update fortnightly, and AI Writing & Study Assistant every 3 weeks. Most recently, PDFIX was updated on October 25, 2026 and AI Writing & Study Assistant on October 10, 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.*