Screen Ruler: Phone Measure

📏 Screen Ruler — turn your phone into a pocket measuring tape

Need a quick length when you don’t have a ruler? Screen Ruler puts millimeter ticks on the edge of the display. Drag the orange guides to the object, read the span, and copy the result. Calibrate once with a bank card so the scale matches real-world mm/cm/in.

No accounts and no cloud — the ruler and your calibration stay on the device.

🔊 How it works
1️⃣ Place a bank card on the screen and match the orange ▲ ▼ to its short edges
2️⃣ Save calibration (or skip and use an estimate)
3️⃣ Drag the guides to the object you want to measure
4️⃣ Switch mm / cm / in and copy the reading

⚠️ Best results after card calibration. Phone DPI alone is often wrong — a real bank card (ISO ID-1 short side ≈ 53.98 mm) is the reference.

🛠 Key features
🟠 Aluminum + tape-style edge ruler
📐 Drag ▲ ▼ measure guides
💳 Bank-card calibration saved on device
🔢 Units: mm, cm, inches
📋 Copy measurement
🔄 Reset guides / recalibrate
⚙️ English and Russian
📴 Works offline after install

🏠 Perfect for
✔ Quick DIY and craft sizes
✔ Checking small parts when a tape is elsewhere
✔ Comparing lengths side by side on the screen
✔ Everyday mm/cm checks at home or at the desk

⚠️ Important notes
Does NOT replace a certified measuring instrument
Does NOT claim laboratory accuracy without calibration
Does NOT measure distance with the camera — on-screen scale only
Accuracy depends on your calibration and how flat the object sits against the glass

🔐 Privacy first
🔒 No accounts
🔒 Calibration and preferences stay on-device
🔒 No cloud required for measuring

📱 Screen Ruler — a clear on-screen scale when you need one