Ruler Studio
Utilities
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
Turn your iPhone or iPad into a clean ruler, grid, and ring sizing tool with quick calibration and local-only settings.
Ruler Studio gives you practical measurement tools in one simple app.
Use an on-screen ruler and grid for quick everyday measurements, switch units, and calibrate the scale to your device. The ring sizer helps estimate inner diameter, circumference, and common ring sizes using an easy visual guide.
Features:
• Centimeter, millimeter, and inch ruler tools
• Full-screen measurement grid
• 1:1 scale reference with calibration
• Ring diameter and circumference guide
• US, UK, EU, and JP ring size estimates
• Local settings with no account required
Ruler Studio is designed for quick reference measurements. For best accuracy, calibrate the app with a standard card and measure from a consistent viewing angle.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Spyridon Bousios, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Spyridon Bousios
- Size
- 20.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Ruler Pro Lifetime USD 2.99
- Copyright
- © 2026 Spyridon Bousios