# PDF Studio vs Tread

The clearest difference is update cadence: Tread at every 4 days against PDF Studio's every 2 weeks. Tread also leads on iOS requirement (13.4 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PDF Studio sells 3 in-app purchases, starting at $2.49 per 7 days and Tread sells 1 in-app purchase, starting at $2.99 per year. Whichever you choose, the download price is not the number that matters.

PDF Studio ships an update every 2 weeks, Tread every 4 days. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | PDF Studio | Tread |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (10 ratings)](https://appshunter.io/ios/app/tread-ai/id6755405651/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | — | Free |
| Size | 6 MB | 26 MB |
| Requires iOS | 17.6 | **13.4** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Boris Spiro](https://appshunter.io/developer/1853293003) | [Majid Sadri](https://appshunter.io/developer/1819096776) |

## What reviewers say

### PDF Studio

[App page](https://appshunter.io/ios/app/pdf-studio-scan-and-edit-docs/id6755344174)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $2.49 | per 7 days |
| Monthly Premium | $4.99 | per month |
| Annual Premium | $29.99 | per year |


### Tread

[App page](https://appshunter.io/ios/app/tread-ai/id6755405651)

Instantly analyze your tire health using your phone's camera. Get advanced tread-depth and tire-condition reports in seconds, no tools or appointments needed. Stay safer on the road with smart ML-powered tire inspection.

**Highlights:** ML-powered tire inspection, Phone camera analysis, Instant tread-depth reports, Tire condition analysis, No tools required, No appointments needed

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Annual | $2.99 | per year |


## Frequently asked questions

### Is PDF Studio free?

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

### Is Tread free?

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

### Do PDF Studio or Tread have ads?

Neither PDF Studio nor Tread shows ads.

### Which is updated more often, PDF Studio or Tread?

PDF Studio ships an update every 2 weeks, and Tread every 4 days. Most recently, PDF Studio was updated on October 18, 2026 and Tread on October 15, 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.*