# WhenDo vs Rocket Cadets

The clearest difference is iOS requirement: WhenDo at 8.1 against Rocket Cadets's 16.4. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

WhenDo ships an update monthly, Rocket Cadets every 3 weeks. The most recent releases landed on October 2, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | WhenDo | Rocket Cadets |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 22 MB | 38 MB |
| Requires iOS | **8.1** | 16.4 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Zhiwei Robotics Co Ltd](https://appshunter.io/developer/643548685) | [Meno Data AB](https://appshunter.io/developer/6788054603) |

## What reviewers say

### WhenDo

[App page](https://appshunter.io/ios/app/whendo/id1001086940)

This tool provides a graphical programming environment for learning Arduino. It simplifies coding by allowing users to drag and combine blocks to create programs. The app supports wireless downloads to compatible Arduino devices and utilizes a cloud server for compilation.

**Highlights:** Graphical programming with drag-and-drop blocks, Clear logic structure (When, Centre Node, Do blocks), Cloud server compilation, Wireless BLE downloads, Compatible with Bluetooth 4.0 Arduino chips

**Features:** macOS Compatibility

**In-app purchases:** none


### Rocket Cadets

[App page](https://appshunter.io/ios/app/rocket-cadets-coding-for-kids/id6788054601)

**Features:** Family Sharing

**In-app purchases:** none


## Frequently asked questions

### Is WhenDo free?

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

### Is Rocket Cadets free?

Rocket Cadets is free to download, with no in-app purchases.

### Do WhenDo or Rocket Cadets have ads?

Neither WhenDo nor Rocket Cadets shows ads.

### Which is updated more often, WhenDo or Rocket Cadets?

WhenDo ships an update monthly, and Rocket Cadets every 3 weeks. Most recently, WhenDo was updated on October 2, 2026 and Rocket Cadets on September 27, 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.*