PacingSplit
Run your session without looking at your watch.
Write an interval workout once. Your Apple Watch counts every segment down and taps your wrist the moment the pace should change.
Three steps, then forget it's there
The whole point is that you stop managing the watch and just run.
Write the session
Type it the way you'd say it, tap it out with wheels, paste it from your coach, or import a screenshot of a training plan.
Send it to your watch
One tap. It arrives even when the watch app is closed, and stays there until you send another.
Run it by feel
Two taps on the wrist when it's time to speed up, one when you can ease off. Your eyes stay on the road.
On the iPhone
A library of sessions, written however suits you.
Every session you've written, ready to send — each one drawn as the shape it is.
Tap it out — repeats fold into one row.
Or type it, in the notation runners already use.
See the session before you run it
Every step is a bar: as wide as it lasts, as tall as it is fast. A pyramid looks like a pyramid. An easy hour looks like a flat band.
The same chart is drawn while you write, next to every session in the library, on the watch's own list, and against every run you have finished — so a session you wrote in March still tells you what it was at a glance.
When the run ends, the watch hands it back to your iPhone and every segment is scored against the pace you wrote for it: on pace, too fast, too slow. The reps are gathered together, so you can see whether you faded across them.
Leave the phone at home
Your whole library is on the watch, and you can write a new session there with nothing but the Digital Crown.
Every session you write on the iPhone syncs across on its own — nothing to send before a run. Pick one on the wrist and go.
And when the phone is at home: Draft a session builds a workout on the watch itself. A warm-up, a block of reps with a recovery between them, a cool-down — every value landed on a wheel with the crown, with the shape of the session drawn as you turn. Keep it and it lands in your iPhone library as ordinary text, next time the two are near each other.
What it does
Built for the session you actually planned, not a generic timer.
Time or distance
Mix 10' @ 6:00 with 800m @ 3:30 in one session.
The watch counts the ground when the ground is what matters.
Haptics you'll feel
Cues fire even with your wrist down and the screen off — the fallback is built in, not an afterthought.
A real recorded run
Saved to Apple Health as a full outdoor run, with heart rate and the route map, so it flows on to wherever you keep your training.
Kilometres or miles
Paces read in whichever you think in. Write 7:30/mi when you
want to be explicit.
Follow a route
Import a GPX file from any planner and follow it on the watch, phone-free, with a nudge when you drift off it.
See how it went
Every segment scored against its target when you finish: on pace, too fast, too slow.
It has no idea who you are
There is no server behind PacingSplit. Not “we don't sell your data” — we never receive it in the first place. The only time the app goes online is when you build a route and it asks Apple Maps for walking directions.
- No account, no sign-in, no email address
- No analytics, no tracking, no advertising, no third-party SDKs
- Your sessions and routes are stored on your own devices
- Runs go to Apple Health, which only you control
- Screenshot import is read on the phone and never uploaded
Coming to the App Store
Free, for iPhone and Apple Watch.