# KACST vs Viola | ڤيولا

The clearest difference is update cadence: KACST at monthly against Viola | ڤيولا's every 18 months. KACST also leads on device support. Viola | ڤيولا's advantage is iOS requirement (11.0 vs 15.6). On price 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.

KACST ships an update monthly, Viola | ڤيولا every 18 months. Both last shipped on September 24, 2026.

## The numbers

| Metric | KACST | Viola | ڤيولا |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Monthly** | Every 18 months |
| Size | 121 MB | 53 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [King Abdulaziz City for Science and Technology](https://appshunter.io/developer/430811043) | [Abdullah Hamoud](https://appshunter.io/developer/1680737388) |

## What reviewers say

### KACST

[App page](https://appshunter.io/ios/app/kacst/id1462168376)

**Features:** macOS Compatibility

**In-app purchases:** none


### Viola | ڤيولا

[App page](https://appshunter.io/ios/app/viola/id1660044131)

**In-app purchases:** none


## Frequently asked questions

### Is KACST free?

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

### Is Viola | ڤيولا free?

Viola | ڤيولا is free to download, with no in-app purchases.

### Which is updated more often, KACST or Viola | ڤيولا?

KACST ships an update monthly, and Viola | ڤيولا every 18 months. Most recently, KACST was updated on September 24, 2026 and Viola | ڤيولا on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*