# CIT App vs Compendium Lab

The clearest difference is in-app purchases: CIT App at none against Compendium Lab's 1. CIT App 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. Compendium Lab sells 1 one-off in-app purchase. CIT App asks for nothing beyond the download.

CIT App ships an update every 2 months, Compendium Lab every 4 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | CIT App | Compendium Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Size | 58 MB | 106 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masato Murai](https://appshunter.io/developer/1839632910) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### CIT App

[App page](https://appshunter.io/ios/app/cit-app/id6752514796)

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

**In-app purchases:** none


### Compendium Lab

[App page](https://appshunter.io/ios/app/compendium-lab-math-and-ai/id6791996424)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Compendium Lab Pro | $5.99 | one-time |


## Frequently asked questions

### Is CIT App free?

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

### Is Compendium Lab free?

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

### Do CIT App or Compendium Lab have ads?

Neither CIT App nor Compendium Lab shows ads.

### Which is updated more often, CIT App or Compendium Lab?

CIT App ships an update every 2 months, and Compendium Lab every 4 weeks. Most recently, CIT App was updated on October 30, 2026 and Compendium Lab on October 31, 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.*