Ruler Kit: Protractor & Level
On-screen ruler, protractor and level. One-tap card calibration,zero permissions
About Ruler Kit: Protractor & Level
No tape measure? Your screen becomes the ruler.
Ruler Kit puts a ruler, a protractor and a bubble level in one app. Hold an object against the screen, drag the cursor lines to its edges, and read the length instantly. Got a credit or transit card? Calibrate accurately in one tap — no physical ruler needed.
■ What you can do
• Screen ruler — cm / mm / inch, drag two cursor lines to an object's edges
• One-tap card calibration — match a card (85.6 mm) or a real ruler and the screen measures true
• Protractor — drag two arms to measure any angle
• Bubble level — check tilt and level instantly (sensor-based)
• Save measurements + see the latest on a home-screen widget
• Dark mode, four languages
■ Privacy first
No camera, no location, no account. Measurements stay entirely on your device. Nothing is sent to a server.
■ Honest about accuracy
Measurements are approximate, based on your screen's physical size, so calibrate once for accuracy. This isn't a replacement for precision instruments.
Pull out the ruler, protractor and level that live in your pocket.
Ruler Kit: Protractor & Level details
Ruler Kit: Protractor & Level is a free Tools app for Android with 1+ installs on Google Play. It was released on September 9, 2026 and last updated on September 10, 2026. It requires Android 7.0 or later. The app contains ads and offers in-app purchases.
- Category
- Tools
- Installs
- 1+
- Price
- Free
- In-app purchases
- Yes
- Ads
- Contains ads
- Current version
- 1.0
- Requires Android
- 7.0
- Content rating
- Everyone
- Released
- September 9, 2026
- Last updated
- September 10, 2026
What’s new in Ruler Kit: Protractor & Level
First release. A ruler, protractor and level in one app. Calibrate with a card, save measurements, and check the latest from a home-screen widget.
Version 1.0 · Updated September 10, 2026
