# Calliope mini vs Open Roberta Mobile

The clearest difference is update cadence: Open Roberta Mobile at every 2 days against Calliope mini's every 3 months. Open Roberta Mobile also leads on iOS requirement (9.3 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Calliope mini ships an update every 3 months, Open Roberta Mobile every 2 days. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Calliope mini | Open Roberta Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.7 (3 ratings)](https://appshunter.io/ios/app/open-roberta-mobile/id1446855164/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 25.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 37 MB | 14 MB |
| Requires iOS | 15.0 | **9.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Calliope gGmbH](https://appshunter.io/developer/1309545544) | [Fraunhofer](https://appshunter.io/developer/487639036) |

## What reviewers say

### Calliope mini

[App page](https://appshunter.io/ios/app/calliope-mini/id1309545545)

This app allows users to program a micro-controller to build robots, transmit messages, and make things move. It features LEDs, buttons, sensors, and Bluetooth for creative coding projects.

**Highlights:** Program micro-controller, Build robots, Transmit messages, Control LEDs, Use motion sensor, Bluetooth communication

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

**In-app purchases:** none


### Open Roberta Mobile

[App page](https://appshunter.io/ios/app/open-roberta-mobile/id1446855164)

Visually program robots and microcontrollers using a drag-and-drop interface. Wirelessly transfer your creations to compatible hardware like LEGO Education WeDo 2.0 via Bluetooth. Explore a gallery of shared programs and access live coding help.

**Highlights:** Visual programming language (NEPO®), Robot and microcontroller control, Wireless Bluetooth transfer, Program sharing gallery, Live coding help, Multi-language support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calliope mini free?

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

### Is Open Roberta Mobile free?

Open Roberta Mobile is free to download, with no in-app purchases.

### Do Calliope mini or Open Roberta Mobile have ads?

Neither Calliope mini nor Open Roberta Mobile shows ads.

### Which is updated more often, Calliope mini or Open Roberta Mobile?

Calliope mini ships an update every 3 months, and Open Roberta Mobile every 2 days. Most recently, Calliope mini was updated on October 16, 2026 and Open Roberta Mobile 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.*