About RunTools

RunTools is a free collection of utilities for runners and coaches. Calculate heart rate zones, convert paces, and get quick answers without the overhead of a full training platform, all in one place.

Mobile app under construction. Stay tuned!

Instant answers

Every tool gives you results the moment you land on the page. No sign-up forms, no loading spinners, no "Calculate" buttons.

Private by design

Everything runs in your browser. We don't collect data, track usage, or require an account. Your inputs stay on your device.

Built for runners

Made by runners who got tired of ad-heavy calculators and bloated training apps when all they needed was a quick answer.

Open source

RunTools is open source and built with Next.js, Tailwind CSS, and Framer Motion. Contributions, feature requests, and bug reports are welcome on GitHub.