# O vs Shikkha Squared

The clearest difference is ads: Shikkha Squared at none against O's shown. Shikkha Squared also leads on update cadence (monthly vs every 8 months) and iOS requirement (13.0 vs 15.6). On price, 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.

O ships an update every 8 months, Shikkha Squared monthly. The most recent releases landed on September 30, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | O | Shikkha Squared |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Monthly** |
| Size | 26 MB | 41 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Albert Mungochi](https://appshunter.io/developer/1724993311) | [Science Platform](https://appshunter.io/developer/1769242103) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-level-physics-revision/id6740166171)

**Features:** macOS Compatibility

**In-app purchases:** none


### Shikkha Squared

[App page](https://appshunter.io/ios/app/shikkha-squared/id6751794182)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Shikkha Squared free?

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

### Do O or Shikkha Squared have ads?

O shows ads; Shikkha Squared does not.

### Which is updated more often, O or Shikkha Squared?

O ships an update every 8 months, and Shikkha Squared monthly. Most recently, O was updated on September 30, 2026 and Shikkha Squared on October 19, 2026.

---

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