What is RunFast?

The weather on your run

Most forecasts tell you the weather in your town. RunFast works out the weather on your run: when you’ll reach each stretch of your route at your pace, and what the air will be like there at that hour.

• The weather cost: how much longer the heat, humidity and wind will make your run, such as “+3 min 25 s”. See what the weather cost means.
• Heat stress, feels like and dew point for every stretch, at the hour you’ll be there. See heat stress levels.
• Your route in colour, from Ideal to Very hard, so you can see where the weather bites. See why the route is coloured.

What you can do

• Map a run, free and with no sign-up, in Map your run. See mapping a run.
• Save casual runs, once or every week, with the forecast by email the evening before. See adding a casual run.
• Add your races, with your goal and your own words, from the route file the organiser sent you. See adding a race.
• Join your club, tap I’m in on its runs and races, and see everyone from the club on a race’s live map. See joining your club’s runs.
• Go live on race day, and share your link and picture. Anyone can follow you in a browser, with no account. See turning on live tracking.
• Follow a runner from their link or by name. See following without an account.

Where you’ll find it

• On the web: runfast.tech/app for your runs, races and clubs, and Map your run.
• The RunFast app for Android, and soon iPhone: the same account, with Runs, Live, Clubs and You, and going live on race day. See RunFast for iPhone and RunFast for Android.

Who it’s for

Runners anywhere, at any pace, on any route: a long run from home, a club’s track night, a trail race or a city marathon. Distances, paces and temperatures come in kilometres or miles, °C or °F. See kilometres and miles.

RunFast is free for everyone. See is RunFast free.

Part of the livedot family

RunFast is part of the livedot family: livedot.me is where people follow riders and runners live, across both apps.