Ruler & Digital Caliper vs Digital Ruler Pro

Measure small, flat objects on your iPhone with an edge ruler and two-jaw digital caliper. On supported iPhone models, start with an approximate device-based screen scale. For a physical check, align a ruler with a 20 mm reference on screen. Lifetime access requires a separate one-time purchase and adds repeated measurements and a session workspace: view a result, use it as a reference, and compare the next object. Results and references remain in the current session. TWO FOCUSED TOOLS • Edge ruler with a movable origin and end marker • Digital caliper with two independently adjustable jaws • Magnified contact guide for placing markers at object edges • Fine-adjust controls for small position changes • Reset markers without resetting calibration FOUR UNIT FORMATS • Millimeters • Centimeters • Decimal inches • Fractional inches, rounded to the nearest 1/64 BUILT FOR REAL-WORLD ALIGNMENT Keep a small object flat against the usable screen edge, move the contact points to its edges, and read the result. Switch tools and units as you work. Use portrait or either landscape orientation, and lock orientation while aligning an object. PRIVATE BY DESIGN Measurement values and marker positions are calculated on your iPhone. There is no account, advertising, camera access, or measurement server. Limited privacy-conscious product analytics never include measurement values, marker positions, or calibration data. Calibration and preferences are stored locally. A PRACTICAL SCREEN TOOL Results depend on calibration, alignment, display settings, screen protectors or cases, and the object being measured. Recalibrate after changing iPhone or Display Zoom. For important measurements, compare the result with a known physical reference. Ruler & Digital Caliper is not a certified measuring instrument. Support: https://rulercaliper.app/support Privacy Policy: https://rulercaliper.app/privacy Terms of Use: https://rulercaliper.app/terms

Turn your iPhone into a precise digital ruler. Measure any object in seconds — in centimeters or inches, with no internet connection required. KEY FEATURES • Linear Ruler — accurate cm and inch measurement with a draggable pointer • 2D Measurement — measure length and width at the same time • Device Calibration — calibrate with a credit card, ID card or A4 paper so results stay reliable on any screen • Measurement History — save, review and manage every reading • Lock Mode — freeze the current reading and take a clean screenshot HOW IT WORKS 1. Calibrate once with a standard object (a credit card works great) 2. Place the object you want to measure on the screen 3. Drag the pointer to the edge and read the result instantly DIGITAL RULER PRO Unlock everything with a single one-time purchase — no subscription, no auto-renewal: • Additional calibration objects (ID card, A4 paper) • Unlimited measurement history • Advanced export with watermark control • Enhanced sharing options Already purchased Pro? Tap "Restore Purchases" on the upgrade screen. PERFECT FOR Home DIY, crafts, sewing, education, furniture checks, package sizing and professional field work — a ruler is always in your pocket. ACCURACY TIP A screen ruler is most accurate after calibration. For best results, calibrate once per device and keep the phone flat and steady while reading. PRIVACY All measurements and settings are stored locally on your device. We do not collect, transmit or share your personal data. No analytics, no ads, no tracking. No internet connection required. Privacy Policy: https://digitalrulerprivacypolicy.vercel.app/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/