📏 Ruler · Tools

Precision in every measurement.

Smart screen ruler, tape measure, calipers, 360° protractor & bubble level.

Get it on Google Play See how it works

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Inside the app

📏 Ruler · Tools

Everything you need, nothing you don't.

📏

Digital Screen Ruler

Measure in mm, cm, decimal inches & fractional inches.

📐

Dual Caliper Sliders

Two-finger touch calipers for small objects like bolts & jewelry.

🧭

360° Protractor

Measure precise surface angles and slopes easily.

⚖️

Spirit Bubble Level

2D bullseye bubble level for alignment and leveling.

💳

Card Calibration

Zero error calibration using a standard card or physical ruler.

🔒

Offline & Private

No telemetry, no tracking, lightweight native utility.

Three steps to measure 📏

Calibrate

Calibrate once using a card or coin for 100% accuracy.

Position

Place object on screen and adjust caliper sliders.

Read

Read instant precise millimeter or inch dimensions.

ABOUT THE APP

Ruler: Tape Measure & Scale

Turn your phone into an ultra-precise digital ruler, caliper, and drafting measurement toolkit!

Whether you need to measure small items in centimeters, millimeters, or fractional inches, align surfaces with a 2D spirit bubble level, or inspect angles with a 360° protractor, Ruler delivers laser-accurate results directly on your screen.

Designed with modern engineering aesthetics and smooth haptic feedback, this is the ultimate pocket measurement tool for carpenters, DIYers, engineers, crafters, students, and designers.

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📐 ALL-IN-ONE MEASUREMENT TOOLS
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• DIGITAL SCREEN RULER: Measure length and width with ease. Supports Millimeters (mm), Centimeters (cm), Decimal Inches, and Fractional Inches (e.g., 3 5/16").
• DUAL CALIPER SLIDERS: Smooth two-finger touch calipers for measuring small parts, screws, bolts, coins, and jewelry with pinpoint accuracy.
• DUAL-EDGE SCALE: Display metric on one edge and imperial on the other simultaneously for instant unit comparison.
• 2D AREA CALCULATOR: Drag length and width calipers to calculate surface areas in real time.
• 360° PROTRACTOR: Measure internal and external angles, slopes, and bevels effortlessly.
• 2D SPIRIT BUBBLE LEVEL: High-precision surface leveler powered by device tilt sensors with real-time degrees readout.

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🎯 SIMPLE & EXACT CALIBRATION
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Every device screen is unique. Ruler ensures 100% true physical accuracy with two simple calibration methods:
1. Credit Card Calibration: Use any standard ISO credit or debit card for instant 1-tap calibration.
2. Physical Ruler: Align with any physical ruler or tape measure to fine-tune down to the exact sub-millimeter.

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✨ DESIGNED FOR PERFECTION
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• Tactile Haptic Feedback: Feel subtle clicks as calipers glide across major tick marks.
• Professional Themes: Choose from vibrant drafting themes including Electric Sky Blue, Emerald Teal, Tangerine Orange, Crimson Ruby Red, Obsidian AMOLED Black, and Classic Wood Finish.
• 100% Offline & Private: No internet required for measuring. Zero tracking, zero account sign-up, and zero personal data collection.
• Lightweight & Fast: Instant startup with minimal battery consumption.

Upgrade to Pro to enjoy a 100% ad-free experience forever with all premium themes unlocked.

Download Ruler today and carry a complete precision measuring station in your pocket!