Circle Judge - Roundness Check
MITSUKO MARGOT KUBOTA ONO Graphics & Design iPhoneiPadiPod touch
Circle Judge - Roundness Check is a free Graphics & Design app for iPhone and iPad by MITSUKO MARGOT KUBOTA ONO. Requires iOS 16.6. Updated August 31, 2026.
- Price
- Free
- on the App Store
- Size
- 6 MB
- Age 4+
- Updated
- Aug 31
- 2026 · v1.2.0
Screenshots
About Circle Judge - Roundness Check
Draw a circle freehand and get its roundness (circularity) scored. The app analyzes your stroke automatically and instantly shows how close it is to a perfect circle in percent. ● Features * One-tap scoring: draw a circle and lift your finger—shows 0–100% roundness * Easy comparison: overlays a same-size reference circle (toggle on/off) * Customization: freely choose pen color and guide color * Simple sharing: share the drawn circle as an image with the score * Appearance: supports Light/Dark Mode ● Great for * Practicing steady, freehand circles * Visualizing and improving hand jitter in design/sketching * Having fun “roundness challenges” with friends and family ● How to use 1. Trace a circle with your finger on the screen 2. Lift your finger to auto-score and show the reference circle 3. Tap Share to send a square image with the score
What’s new
Version 1.2.0 · Updated August 31, 2026
Added a one-time purchase option to remove ads. You can purchase it or restore your purchase from Settings.
App privacy
The developer, MITSUKO MARGOT KUBOTA ONO, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location: Coarse Location
- Identifiers: Device ID
- Usage Data: Product Interaction, Advertising Data
- Diagnostics: Crash Data, Performance Data
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Location: Coarse Location
- Identifiers: Device ID
- Usage Data: Product Interaction, Advertising Data
- Diagnostics: Crash Data, Performance Data
Used for: Third-Party Advertising
Alternatives to Circle Judge - Roundness Check
Looking for apps like Circle Judge - Roundness Check? Here are 6 similar apps on the App Store. The highest rated is Coloring Book : ColoringBooksZ (5.0/5), and 5 of the 6 are free to download.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Circle Judge - Roundness Check | – | Free | August 31, 2026 | |
| Circle Master - Challenge | 2.0 / 5 (1) | Free | May 28, 2024 | Compare |
| CircleMaster -Circle scoring- | 4.6 / 5 (30) | Free | Sep 11, 2026 | Compare |
| Coloring Book : ColoringBooksZ | 5.0 / 5 (3) | Free | May 19, 2026 | Compare |
| Kaleido-Art | – | Free | Jul 31, 2026 | Compare |
| 小白学CAD | – | 0.99 USD | Apr 30, 2026 | Compare |
| One Circle - Draw one circle | – | Free | Apr 16, 2026 | Compare |