# I vs Math Sphere

The clearest difference is ads: Math Sphere at none against I's shown. Math Sphere also leads on update cadence (every 3 weeks vs every 6 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

I ships an update every 6 months, Math Sphere every 3 weeks. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | I | Math Sphere |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Size | 35 MB | 25 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Towa TAKEUCHI](https://appshunter.io/developer/1681125787) | [otsuki hayato](https://appshunter.io/developer/1828600192) |

## What reviewers say

### I

[App page](https://appshunter.io/ios/app/i-memo/id6502877993)

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

**In-app purchases:** none


### Math Sphere

[App page](https://appshunter.io/ios/app/math-sphere/id6749747366)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is I free?

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

### Is Math Sphere free?

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

### Do I or Math Sphere have ads?

I shows ads; Math Sphere does not.

### Which is updated more often, I or Math Sphere?

I ships an update every 6 months, and Math Sphere every 3 weeks. Most recently, I was updated on October 27, 2026 and Math Sphere on October 30, 2026.

---

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