# Math Sphere vs Kakidoc

The clearest difference is in-app purchases: Math Sphere at none against Kakidoc's 1. Math Sphere also leads on iOS requirement (13.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kakidoc sells 1 in-app purchase, starting at $5.99 per month. Math Sphere asks for nothing beyond the download.

Math Sphere ships an update every 3 weeks, Kakidoc fortnightly. Both last shipped on October 8, 2026.

## The numbers

| Metric | Math Sphere | Kakidoc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 25 MB | 52 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [otsuki hayato](https://appshunter.io/developer/1828600192) | [Daisuke Kijihana](https://appshunter.io/developer/1718388562) |

## What reviewers say

### Math Sphere

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Kakidoc

[App page](https://appshunter.io/ios/app/kakidoc/id6772444946)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Plan(Monthly) | $5.99 | per month |


## Frequently asked questions

### Is Math Sphere free?

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

### Is Kakidoc free?

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

### Do Math Sphere or Kakidoc have ads?

Neither Math Sphere nor Kakidoc shows ads.

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

Math Sphere ships an update every 3 weeks, and Kakidoc fortnightly. Most recently, Math Sphere was updated on October 8, 2026 and Kakidoc on October 8, 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.*