Angle Tools
About Us
Angle Tools is an independent suite of browser-based utilities for measuring, calculating and understanding angles without accounts, advertising or tracking scripts.
Our Mission
Measuring angles on a phone, tablet or workstation should not require an account or uploading a photo. Angle Tools provides practical geometric measurement and calculation in the browser, using device capabilities only when a tool needs them and you grant access.
Core Principles
Honest Precision
Measurement tools show practical precision and, where available, an estimated uncertainty. Important work should still be checked with a calibrated instrument.
100% Client-Side Privacy
Photos, camera frames, and gyroscope readings never touch a server. All image rectification and angle calculations happen in local JavaScript memory.
Universal & Offline Access
Installable as a PWA, Angle Tools keeps working in a basement, workshop, jobsite, or remote location with no internet. Full keyboard navigation and screen-reader readouts are built in.
Modern Web Standards
Built with static HTML, Canvas, SVG, WebRTC and DeviceOrientation APIs, without advertising trackers or third-party analytics.
Why We Built It
From woodworking and roof framing to physical therapy goniometry and architectural drafting, angle measurement is fundamental. Yet digital measuring tools are often inaccurate, filled with deceptive precision, or compromise user privacy by transmitting images off-device.
Angle Tools combines geometry, device sensors and optional perspective correction with a focused interface. The site is keyboard accessible, installable as a Progressive Web App, and designed to keep tool data on the device.
Start Measuring
Open any of our tools right now — free, instant, and with nothing to install.