About Us

Our Mission

Real Online Protractor was built with a simple goal: provide the most accurate, privacy-respecting, and completely free angle measurement tool on the web. Whether you're a student learning geometry, a carpenter checking miter joints, an engineer reviewing CAD drawings, or a designer aligning UI elements — you deserve a tool that works without compromise.

Why We Built This

Existing online protractors fell short: they uploaded images to servers, required accounts, showed intrusive ads, or lacked precision. We believed angle measurement should be 100% client-side, instant, and free — no data leaving your device, no tracking, no paywalls.

What Makes Us Different

• True Client-Side Processing: All calculations, image rendering, PDF generation, and camera streaming happen in your browser via WebAssembly and Canvas APIs.
• Zero Data Collection: No analytics, no cookies, no user accounts, no image uploads. Your measurements stay yours.
• Engineering-Grade Precision: 0.0001° computational accuracy with sub-pixel vertex snapping and 4x Retina export.
• Professional Features: 180°/360° modes, 3-point & 4-point angle tools, live camera overlay, angle converter, printable PDFs, SVG/PNG export.
• Open & Accessible: Works on any modern browser, mobile-friendly, keyboard-navigable, screen-reader compatible.

Technology Stack

Built with Astro for lightning-fast static delivery, TypeScript for type-safe calculations, Tailwind CSS v4 for responsive design, and HTML5 Canvas for hardware-accelerated rendering. Deployed on Cloudflare Pages for global edge performance with zero cold starts.

Our Commitment

Real Online Protractor will always remain free, private, and ad-free. We don't sell user data because we don't collect any. We don't show ads because the tool speaks for itself. If you find it useful, share it with colleagues, students, or anyone who needs precise angles — that's the only "payment" we ask.