# Computed Tomography vs useit

The clearest difference is update cadence: useit at fortnightly against Computed Tomography's every 12 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.

Computed Tomography ships an update every 12 months, useit fortnightly. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Computed Tomography | useit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Fortnightly** |
| Size | 67 MB | 61 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Carl Zeiss AG](https://appshunter.io/developer/488066215) | [Suresh Paranjothy](https://appshunter.io/developer/1587131308) |

## What reviewers say

### Computed Tomography

[App page](https://appshunter.io/ios/app/computed-tomography/id1300055902)

**In-app purchases:** none


### useit

[App page](https://appshunter.io/ios/app/useit/id6747667589)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Computed Tomography free?

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

### Is useit free?

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

### Do Computed Tomography or useit have ads?

Neither Computed Tomography nor useit shows ads.

### Which is updated more often, Computed Tomography or useit?

Computed Tomography ships an update every 12 months, and useit fortnightly. Most recently, Computed Tomography was updated on October 14, 2026 and useit on October 16, 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.*