# Math Grade Six vs Know It

The clearest difference is in-app purchases: Math Grade Six at none against Know It's 2. Math Grade Six also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Know It sells 2 in-app purchases, starting at $3.99 per month. Math Grade Six asks for nothing beyond the download.

Math Grade Six ships an update every 3 weeks, Know It every 2 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Math Grade Six | Know It |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 24 MB | 50 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ngoc Anh Nguyen](https://appshunter.io/developer/1861262689) | [NOLAN OLIVIER DANIEL ESSERTAIZE](https://appshunter.io/developer/1876489727) |

## What reviewers say

### Math Grade Six

[App page](https://appshunter.io/ios/app/math-grade-six/id6756538273)

**Features:** macOS Compatibility

**In-app purchases:** none


### Know It

[App page](https://appshunter.io/ios/app/know-it-feynman/id6759038082)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Abonnement étudiant | $3.99 | per month |
| Abonnement Illimité | $12.99 | per month |


## Frequently asked questions

### Is Math Grade Six free?

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

### Is Know It free?

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

### Do Math Grade Six or Know It have ads?

Neither Math Grade Six nor Know It shows ads.

### Which is updated more often, Math Grade Six or Know It?

Math Grade Six ships an update every 3 weeks, and Know It every 2 months. Most recently, Math Grade Six was updated on October 16, 2026 and Know It on October 15, 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.*