# MindPen vs K37 Simple Flows

The clearest difference is device support: MindPen at 4 against K37 Simple Flows's 2. MindPen also leads on iOS requirement (13.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. MindPen sells 3 in-app purchases, starting at $4.99 per month and K37 Simple Flows sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | MindPen | K37 Simple Flows |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | — |
| Size | 36 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MOBIZATE](https://appshunter.io/developer/1885913602) | [K37 Software LLC](https://appshunter.io/developer/1886297629) |

## What reviewers say

### MindPen

[App page](https://appshunter.io/ios/app/mindpenmind-map-brainstorming/id6773913398)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MindPen Premium Monthly | $4.99 | per month |
| MindPen Premium Yearly | $19.99 | per year |
| MindPen Premium Lifetime | $49.99 | one-time |


### K37 Simple Flows

[App page](https://appshunter.io/ios/app/k37-simple-flows/id6800538438)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Flows Full Unlock | $2.99 | one-time |


## Frequently asked questions

### Is MindPen free?

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

### Is K37 Simple Flows free?

K37 Simple Flows is free to download, with in-app purchases available.

### Do MindPen or K37 Simple Flows have ads?

Neither MindPen nor K37 Simple Flows shows ads.

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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.*