# WhenDo vs SyntBlaze

The clearest difference is in-app purchases: WhenDo at none against SyntBlaze's 2. WhenDo also leads on iOS requirement (8.1 vs 15.6). SyntBlaze's advantage is update cadence (weekly vs monthly) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. SyntBlaze sells 2 in-app purchases, starting at $19.99 per month. WhenDo asks for nothing beyond the download.

WhenDo ships an update monthly, SyntBlaze weekly. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | WhenDo | SyntBlaze |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | — |
| Size | 22 MB | 100 MB |
| Requires iOS | **8.1** | 15.6 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Shanghai Zhiwei Robotics Co Ltd](https://appshunter.io/developer/643548685) | [SyntBlaze LLC](https://appshunter.io/developer/1842700159) |

## 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


### SyntBlaze

[App page](https://appshunter.io/ios/app/syntblaze-coding-practice/id6753146947)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $19.99 | per month |
| Pro Yearly | $119.00 | per year |


## Frequently asked questions

### Is WhenDo free?

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

### Is SyntBlaze free?

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

### Do WhenDo or SyntBlaze have ads?

Neither WhenDo nor SyntBlaze shows ads.

### Which is updated more often, WhenDo or SyntBlaze?

WhenDo ships an update monthly, and SyntBlaze weekly. Most recently, WhenDo was updated on October 2, 2026 and SyntBlaze on October 10, 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.*