# Computer Science Calculations vs Onii

The clearest difference is ads: Onii at none against Computer Science Calculations's shown. Computer Science Calculations's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.2). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Computer Science Calculations sells 3 in-app purchases, starting at $0.99 per 3 months and Onii sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Computer Science Calculations ships an update monthly, Onii every 3 weeks. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Computer Science Calculations | Onii |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 26 MB | 12 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Egal Net di Ettore Gallina](https://appshunter.io/developer/993232047) | [Nicolas Ducamp](https://appshunter.io/developer/1575394411) |

## What reviewers say

### Computer Science Calculations

[App page](https://appshunter.io/ios/app/computer-science-calculations/id1488787780)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version (3 months) | $0.99 | per 3 months |
| PRO Version (1 year) | $2.49 | per year |
| PRO Version (Lifetime) | $11.99 | one-time |


### Onii

[App page](https://appshunter.io/ios/app/onii-tasks-and-focus/id6753007452)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - 1 mois | $3.99 | per month |
| Premium - 1 an | $24.99 | per year |


## Frequently asked questions

### Is Computer Science Calculations free?

Computer Science Calculations is free to download, with in-app purchases available.

### Is Onii free?

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

### Do Computer Science Calculations or Onii have ads?

Computer Science Calculations shows ads; Onii does not.

### Which is updated more often, Computer Science Calculations or Onii?

Computer Science Calculations ships an update monthly, and Onii every 3 weeks. Most recently, Computer Science Calculations was updated on November 11, 2026 and Onii 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.*