# 3D Printer Idle vs Brain

The clearest difference is ads: Brain at none against 3D Printer Idle's shown. Brain also leads on update cadence (every 2 days vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

3D Printer Idle ships an update every 4 months, Brain every 2 days. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 3D Printer Idle | Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 189 MB | 16 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sena Nur Akyuz](https://appshunter.io/developer/1647433668) | [Avi Berger](https://appshunter.io/developer/1821636945) |

## What reviewers say

### 3D Printer Idle

[App page](https://appshunter.io/ios/app/3d-printer-idle-print-3d-fun/id6743059457)

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

**In-app purchases:** none


### Brain

[App page](https://appshunter.io/ios/app/brain-trainer/id6760421454)

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

**In-app purchases:** none


## Frequently asked questions

### Is 3D Printer Idle free?

3D Printer Idle is free to download, with no in-app purchases.

### Is Brain free?

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

### Do 3D Printer Idle or Brain have ads?

3D Printer Idle shows ads; Brain does not.

### Which is updated more often, 3D Printer Idle or Brain?

3D Printer Idle ships an update every 4 months, and Brain every 2 days. Most recently, 3D Printer Idle was updated on October 17, 2026 and Brain on October 7, 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.*