# Tracer Study vs CATT1

The clearest difference is update cadence: Tracer Study at fortnightly against CATT1's every 7 months. CATT1's advantage is iOS requirement (13.0 vs 15.0). 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.

Tracer Study ships an update fortnightly, CATT1 every 7 months. The most recent releases landed on September 18, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Tracer Study | CATT1 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 7 months |
| Size | 54 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Vista It Solutions](https://appshunter.io/developer/1381125329) | [Integrated Medical Development LLC](https://appshunter.io/developer/1754431765) |

## What reviewers say

### Tracer Study

[App page](https://appshunter.io/ios/app/tracer-study/id6444187740)

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

**In-app purchases:** none


### CATT1

[App page](https://appshunter.io/ios/app/catt1/id6514321845)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tracer Study free?

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

### Is CATT1 free?

CATT1 is free to download, with no in-app purchases.

### Do Tracer Study or CATT1 have ads?

Neither Tracer Study nor CATT1 shows ads.

### Which is updated more often, Tracer Study or CATT1?

Tracer Study ships an update fortnightly, and CATT1 every 7 months. Most recently, Tracer Study was updated on September 18, 2026 and CATT1 on September 26, 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.*