# sketchometry vs Calliope mini

The clearest difference is review sentiment: sketchometry at 65% against Calliope mini's 26%. sketchometry also leads on update cadence (every 10 days vs every 3 months). 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.

sketchometry ships an update every 10 days, Calliope mini every 3 months. The most recent releases landed on June 25, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | sketchometry | Calliope mini |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/sketchometry/id635195332/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **65.0% of reviews** | 25.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 months |
| Monetization | Free | Free |
| Size | 82 MB | 37 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Universitaet Bayreuth](https://appshunter.io/developer/926230632) | [Calliope gGmbH](https://appshunter.io/developer/1309545544) |

## What reviewers say

### sketchometry

[App page](https://appshunter.io/ios/app/sketchometry/id635195332)

This app transforms your finger drawings into precise geometric shapes on your iPhone or iPad. It turns math into an experimental subject, encouraging learners to discover concepts through hands-on interaction rather than presenting pre-made solutions.

**Highlights:** Finger-to-geometry conversion, Dynamic mathematical exploration, Experimental learning approach, Interactive geometric drawing, Supports iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is sketchometry free?

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

### Is Calliope mini free?

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

### Do sketchometry or Calliope mini have ads?

Neither sketchometry nor Calliope mini shows ads.

### Which is updated more often, sketchometry or Calliope mini?

sketchometry ships an update every 10 days, and Calliope mini every 3 months. Most recently, sketchometry was updated on June 25, 2026 and Calliope mini on September 23, 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.*