# Know vs Rechenflow Mental Math

The clearest difference is in-app purchases: Rechenflow Mental Math at none against Know's 12. Rechenflow Mental Math also leads on update cadence (every 5 days vs every 2 months). Know's advantage is iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Know sells 12 in-app purchases, starting at $3.99 per month. Rechenflow Mental Math asks for nothing beyond the download.

Know ships an update every 2 months, Rechenflow Mental Math every 5 days. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Know | Rechenflow Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/know-it-all-a-guessing-game/id1522005194/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 64 MB | 56 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flying Potato Entertainment](https://appshunter.io/developer/1436832344) | [Christian Hermann und Martina Hermann GbR](https://appshunter.io/developer/1882361365) |

## What reviewers say

### Know

[App page](https://appshunter.io/ios/app/know-it-all-a-guessing-game/id1522005194)

Engage in a multiplayer guessing game where players estimate facts across various themes. Compete with friends to achieve the highest score and earn bragging rights.

**Highlights:** Multiplayer guessing gameplay, Estimate facts on various themes, Create custom games with chosen sets and rounds, Shared paid content access, Fun mode for bonus points, Competitive scoring system

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Monthly | $3.99 | per month |
| Premium - Yearly | $22.99 | per year |
| The 2000's II | $1.99 | one-time |
| Medical Curiosities | $1.99 | one-time |
| History lessons I | $1.99 | one-time |
| World records | $1.99 | one-time |
| Crazy stuff | $1.99 | one-time |
| Foodissimo | $1.99 | one-time |
| Let's talk about sex | $1.99 | one-time |
| Hollywood | $1.99 | one-time |
| Crazy world of liquors | $1.99 | one-time |
| All 11 Sets - Save 50% | $10.99 | one-time |


### Rechenflow Mental Math

[App page](https://appshunter.io/ios/app/rechenflow-mental-math/id6776089329)

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

**In-app purchases:** none


## Frequently asked questions

### Is Know free?

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

### Is Rechenflow Mental Math free?

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

### Do Know or Rechenflow Mental Math have ads?

Neither Know nor Rechenflow Mental Math shows ads.

### Which is updated more often, Know or Rechenflow Mental Math?

Know ships an update every 2 months, and Rechenflow Mental Math every 5 days. Most recently, Know was updated on October 25, 2026 and Rechenflow Mental Math on October 23, 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.*