# 知行AI vs MathMind

The clearest difference is in-app purchases: 知行AI at none against MathMind's 5. 知行AI also leads on ads (none vs shown). MathMind's advantage is update cadence (every 3 days vs every 2 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. MathMind sells 5 one-off in-app purchases. 知行AI asks for nothing beyond the download.

知行AI ships an update every 2 weeks, MathMind every 3 days. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 知行AI | MathMind |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 29 MB | 9 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [湖南亿谷信息科技发展有限公司](https://appshunter.io/developer/979121213) | [Lojas Software Corp](https://appshunter.io/developer/1799458054) |

## What reviewers say

### 知行AI

[App page](https://appshunter.io/ios/app/ai/id6743461129)

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

**In-app purchases:** none


### MathMind

[App page](https://appshunter.io/ios/app/mathmind-test-your-skills/id6746140680)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Homework Helper | $0.99 | one-time |
| The Calculator | $0.99 | one-time |
| The Study Guide | $1.99 | one-time |
| The Supercomputer | $1.99 | one-time |
| The Professor’s Notes | $3.99 | one-time |


## Frequently asked questions

### Is 知行AI free?

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

### Is MathMind free?

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

### Do 知行AI or MathMind have ads?

MathMind shows ads; 知行AI does not.

### Which is updated more often, 知行AI or MathMind?

知行AI ships an update every 2 weeks, and MathMind every 3 days. Most recently, 知行AI was updated on October 24, 2026 and MathMind on October 4, 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.*