Ruler

Don't have a tape measure handy when buying furniture, drawing designs, or checking small object sizes? Ruler is a premium, offline-first physical measurement utility designed to transform your smartphone screen into an incredibly accurate pocket ruler. By utilizing your device's exact hardware display density, Ruler provides a calibrated, physically accurate measuring scale for everyday use. Whether you are a student, hobbyist, carpenter, or DIY designer, Ruler helps you make fast measurements on the go.

What makes Ruler distinct is its responsive drag-guided slider handle and integrated measurements vault. Instead of squinting at tiny tick marks on your screen, you can slide the neon guide guidelines to align perfectly with the boundaries of your object. The app displays real-time digital readouts of the measurement in both decimal centimeters and fractional inches simultaneously. If your screen requires adjustments, the built-in DPI calibration slider lets you fine-tune the scale factor against a known reference object to guarantee 100% precision.

KEY FEATURES

• Bidirectional Measure Scales - Toggle instantly between Metric (centimeters/millimeters) and Imperial (inches/sixteenths) units.
• Drag-Adjustable Guide Slider - Slide the coral line handle to align with the edge of the object for an exact readout.
• Double Digital Readout - View precise decimal values alongside fractional notation (e.g. 13/16 inches) for easy reading.
• Saved Measurements Vault - Log your dimensions with custom item labels (e.g., "Dining table screw") inside a local database library.
• Hardware-Calibrated Scale - Calibrates automatically using your device screen's native horizontal and vertical DPI parameters.
• Manual Calibration Slider - Adjust the scale multiplier factor manually to match any screen density or protective cover thickness.
• Fast Label Clear - Reset the label text input panel with a single tap to start logging new items immediately.
• Premium Slate Theme - Measure comfortably in low light with a dark charcoal canvas accented with neon yellow and coral.
• Offline Privacy Guard - Keep your measurements confidential with a utility that requests no network access and has zero ads.

HOW IT WORKS

Position the Object: Place the item you want to measure directly on your device screen, aligned with the zero line at the top.

Adjust the Slider: Drag the neon coral handle until the guideline matches the bottom edge of the object.

Save the Dimension: View the digital readouts, enter a description label, and tap the add button to log the measurement.

PERFECT FOR

• Crafters & Model Makers: Check screw sizes, wire gauges, or component margins during assembly.
• Designers & Architects: Make quick scaling references when drafting plans or looking at prototypes.
• Office Workers: Measure standard paper sheets, envelopes, pens, or desk accessories in seconds.

PRIVACY AND TRUST

Ruler is designed with your absolute privacy in mind. The app runs 100% offline-first and stores all logged measurements locally. It requires no accounts, no profiles, and contains zero tracking scripts.

Turn your screen into a precision instrument. Download Ruler today and measure anything with absolute privacy.