# Oomsub vs CRRU Smart

The clearest difference is iOS requirement: Oomsub at 13.0 against CRRU Smart's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Oomsub ships an update every 2 months, CRRU Smart every 5 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Oomsub | CRRU Smart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 32 MB | 49 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Royal Thai Army](https://appshunter.io/developer/1566106556) | [CHIANG RAI RAJABHAT UNIVERSITY](https://appshunter.io/developer/1613678764) |

## What reviewers say

### Oomsub

[App page](https://appshunter.io/ios/app/oomsub/id1628961341)

**Features:** macOS Compatibility

**In-app purchases:** none


### CRRU Smart

[App page](https://appshunter.io/ios/app/crru-smart/id1660729955)

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

**In-app purchases:** none


## Frequently asked questions

### Is Oomsub free?

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

### Is CRRU Smart free?

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

### Do Oomsub or CRRU Smart have ads?

Neither Oomsub nor CRRU Smart shows ads.

### Which is updated more often, Oomsub or CRRU Smart?

Oomsub ships an update every 2 months, and CRRU Smart every 5 weeks. Most recently, Oomsub was updated on November 7, 2026 and CRRU Smart on November 3, 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.*