sketchometry vs Calliope mini
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
sketchometry
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.
- Finger-to-geometry conversion
- Dynamic mathematical exploration
- Experimental learning approach
- Interactive geometric drawing
- Supports iPhone and iPad
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Fascinatingly simple. Simply fascinating. sketchometry is a different kind of dynamic math software. You draw with your finger on your iPhone or iPad. sketchometry automatically converts these (finger) sketches into exact geometric objects. Mathematics becomes an experimental subject. No ready-made results are presented, learners are encouraged to go on a journey of discovery by themselves.
Calliope mini
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.
- Program micro-controller
- Build robots
- Transmit messages
- Control LEDs
- Use motion sensor
- Bluetooth communication
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With Calliope mini you have countless creative options right at your fingertips. You want to build a robot or transmit messages? With just a few clicks you can create a program for the controller and make things move. Besides 25 red plus three RGB-LEDs and two programmable buttons the board contains a combined position sensor with motion sensor and compass as well as a bluetooth module that allows the Calliope mini to communicate with other devices.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | sketchometry | Calliope mini |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) — better | — |
| Positive reviews | 65.0% of reviews — better | 25.6% of reviews |
| Number of ratings | 5 — better | — |
| Update frequency | Every 10 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 82 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Universitaet Bayreuth | Calliope gGmbH |
Customer experience
sketchometry
Calliope mini
In-app purchases
sketchometry
No in-app purchases
Calliope mini
No in-app purchases
