1. The Core Principle: Zero Friction, Privacy First
At oStopwatch (Online Stopwatch), accessible at https://ostopwatch.com, our core philosophy is simple: precision timing tools should just work. We do not require accounts, logins, email addresses, or app downloads.
2. Client-Side Timers & Local Storage
All stopwatch operations, lap recordings, reaction test scores, and customization settings (such as dial faces, dark/light mode, and custom colors) run 100% locally in your browser using standard client-side APIs (performance.now() and localStorage).
Your lap splits, personal reaction records, and custom settings remain on your device and are never uploaded or transmitted to our origin servers.
3. Cookies and Analytics
We do not use advertising tracking cookies or cross-site profiling trackers. We may use lightweight, privacy-focused, cookieless analytics to monitor aggregate visitor volume and ensure global CDN edge performance. This data is strictly anonymous and never tied to personal identities.
4. Printable PDF Generation
When you use our Printable Timing Sheets (such as Lap Times, Race Heats, or Science Experiment Grids), all PDF rendering and print previews are performed client-side using browser print engines. None of your entered athlete names, heat numbers, or trial data are stored on our servers.
5. Policy Updates
We may periodically update this policy to reflect new browser capabilities or security practices. The latest revision date is always noted at the top of this document.