FURLONG

A running coach for people who'd rather not get hurt

Most running apps
push you to do more.

This one tells
you to stop.

Furlong reads your running history from Apple Health, models the load you're actually carrying, and each morning tells you one thing: run this, or don't — and exactly why.

Coming soon to the App Store. iPhone. Free.

Because the others are counting.
Furlong is deciding.

Tracking apps record what you did. Social apps show you what everyone else did. Neither knows the difference between the week you can absorb and the week that breaks you.

Most running injuries don't come from a bad run. They come from a good week, stacked on another good week, at a moment your body hadn't caught up. Furlong watches the rate of change, not just the total — so it eases off before you feel it, rather than after.

Furlong showing a large heading reading Rest, with the reason: your calf keeps coming back, and worse. Give it two days.
It will hold the plan — and tell you when something needs a physiotherapist, not a shorter route.
Furlong showing today's recommendation of 8 km with suggested time, pace and heart rate.
One recommendation each morning. Distance, effort, or rest.
Furlong explaining that today's run lifted the load ratio from 1.07 to 1.31, above the quiet zone, and easing tomorrow in response.
Every suggestion carries its cause. Nothing is a black-box score.
Furlong trends screen showing fitness base, load ratio, weeks in the quiet zone and cross-training.
Trends that answer “am I actually fitter?” — not vanity charts.

What it does

One thing each morning

A distance and an effort, or a rest day. Not a dashboard to interpret.

The reason, always

Every recommendation shows the cause behind it. You can always ask where it came from.

Sees it coming

Watches acute load against your chronic base, and eases off before the week gets away from you.

Listens to niggles

Report one and the plan holds until it settles — and says plainly when it's beyond an app.

Builds the long run

Deliberately, week by week, instead of letting it drift.

Works around your life

Pick your long-run day, add a race, and the plan rebuilds around it.

Privacy

Nothing leaves your phone.

Not a promise about how we behave — an absence of the means. Furlong contains no networking code at all. There is no mechanism by which your data could be sent anywhere, because none was built.

  • No account, no sign-up, no server
  • No analytics, no crash reporting, no third-party SDKs
  • No ads, ever — your health data is nobody's business, including ours
  • Reads Apple Health; never writes to it
  • Everything stored on your device, and erasable in one tap

Read the full privacy policy →

Who it's not for

If you want kudos, leaderboards, segments or a feed, this is the wrong app and you'll dislike it. If you want to be told to push harder every day, you'll dislike it more.

The fastest runner is the one who isn't injured.

Furlong offers training guidance, not medical advice. It does not diagnose, treat or prevent injury or any medical condition, and it cannot know what's happening in your body. Pain that persists, worsens, or changes how you move belongs to a doctor or physiotherapist — not to an app. Always seek professional advice before starting or changing an exercise programme.