For runners who measure things · Apple Watch · 2026
Turn your Apple Watch
into a real running watch.
Everything a dedicated running watch should do — pace and distance you can trust, watch faces you customize, structured intervals, lane-exact track mode — plus a coach that builds your plan and explains every run. The recorder and the coach, finally in one app.
A coach in your pocket.
Adaptive 5K, 10K, half, and marathon plans built around your training load. Easy days stay easy. Quality days are earned. Your plan adjusts when life gets in the way.
Race-watch metrics.
VO₂ max, CTL · ATL · Form, lactate-threshold HR zones, daily readiness, pre-run pace forecast. The numbers serious runners actually plan around — now on Apple Watch.
Watch faces built for the workout.
Two purpose-built run modes — outdoor and treadmill — with track and structured-interval overlays. Race-watch-style data fields, lap-by-lap counted reps, OLED contrast that reads at a sprint.
The watch face
serious runners deserve.
Distance and pace you can trust, race-watch-grade data fields you arrange yourself, and lane-exact track mode. Hand-tuned for the workout you're actually doing — not a generic one.
Structured workouts on the wrist.
Start from a preset library with a rep stepper, or build your own — pyramids, ladders, and multi-block sessions. The watch counts every rep down, holds your target pace, and buzzes the next block — like a dedicated running watch, without buying a second one.
HR-zone discipline, visualized.
A rainbow zone bar bulges where you are right now. No squinting. No labels. You catch an easy run creeping too hard the moment it happens — and pull it back before the workout falls apart.
Lane-exact track mode.
Pick a lane on a 400 m oval — distance accumulates by the lane's geometry, not GPS noise. Lane 1 is 400.0 m. Lane 5 is 430.5 m. Lane 8 is 453.7 m. IAAF-correct, every lap.
Real screens · captured mid-run
Six screens.
One run.
Not renders. Real frames on Apple Watch Ultra — the pre-run sensor check, the start, and four live layouts you flick between mid-effort with the Digital Crown. 13+ ship in the app.
Every run, coached.
“Solid tempo. You held 4:35/km for 8K with HR drift under 4% — a clean aerobic effort. Bumping next week's tempo to 9K at the same pace. Readiness is 78 this morning, so Thursday's intervals stay on. Your fitness (CTL) is up 4% this block and Form has flipped from –12 to +6 — you're race-ready.”
Fitness & Form
CTL · ATL · Form (Banister)
HR Zones
Lactate-threshold based
VO₂ Max
Cardiac + Daniels, fused
Readiness
HRV · Sleep · RHR · Load
Under the hood
The data layer most
running apps skip.
Race-watch training science, with the math out in the open. No black boxes. No proprietary “effort” scores.
Daily
Readiness, scored.
Each morning, a 0–100 readiness score from overnight HRV (40%), sleep (25%), resting HR (20%), and yesterday's load (15%). The weights are published. You can see why the number moved.
Long-arc
Building fitness, or digging a hole?
42-day chronic load, 7-day acute load, Form = CTL – ATL. The same Banister/PMC curves coaches charge a subscription for — built in, no add-on, no extra account.
Personal
Lactate-threshold HR zones.
Zones derived from your real LTHR — re-estimated weekly from how your heart actually responded to your last block. Not 220-minus-age. Not a generic %HRmax.
Track-style
Personal segments.
Draw a segment on the map. Every past and future run gets auto-matched and ranked. Your own leaderboard, no Strava account required.
Records
Best efforts at every distance.
Sliding window across all your runs to find your fastest 1 mi, 5K, 10K, half, and marathon — even if you weren't racing that day.
Hills
Your true effort on every hill.
Minetti polynomial. See your true effort on rolling terrain — finally compare a hilly tempo to a flat one without lying to yourself.
Recovery
Recovery Time, in hours.
After every run, an estimate of how long until you're ready for the next hard session — scaled by duration, intensity, and how recovered you walked in. The race-watch number that tells you when to push and when to wait.
Per-run
What each run actually trained.
Two scores, each 0–5, on every run. Did this build your aerobic base, sharpen your top end, or just bank junk miles? You see what the session actually trained — not just that you moved.
Calories
Calories that track effort.
Most apps multiply distance by a constant — an easy 10K and a brutal one read identical. We use an HR-based model (Keytel 2005), so the number rises with how hard your heart actually worked.
Live, on the wrist
Race-watch reflexes.
AI that knows your week.
The training data is only as good as the signal. Here's the part the spec sheet usually skips.
Live pace
GPS pipeline that earns the data.
Doppler-derived speed from the very first fix — live pace is honest before you've covered 50 m. An anti-jitter accumulator throws out spike-fixes the moment they happen, so a 4:30 tempo never blinks 3:20. We can't make Apple's GPS chip better. We can stop the software from wasting it.
Always-on
Live Activity + Dynamic Island.
Pace, HR, distance, cadence, and zone pinned to your lock screen and the Dynamic Island the entire run. No swipe. No raise-to-wake. The data is there the second you glance.
On-device AI
An AI coach with four jobs.
Pre-run brief grounded in today's readiness. Post-run audit that explains what the numbers mean. Daily readiness with calendar context. Ask-anything Q&A. Gemini 2.5 Flash, your data, your context — never a generic plan.
Indoor
Treadmill calibration that holds up.
Your outdoor stride length is learned and carried indoors. Cadence × calibrated stride keeps pace and distance honest on the belt — no manual adjust knob, no “estimated” asterisks.
Plan it
Routes generated around you.
Ask for a 5 km loop from where you stand. The app draws three real walk-routed loops at 0° / 120° / 240° bearings — actual streets, not a circle on a map. Falls back gracefully when the network of paths gets thin.
Watch face
Complications that earn their spot.
QuickStart launches a run from any face in one tap. WeeklyStats keeps your mileage ring visible all week. LastRun shows your last pace and HR at a glance. Built like running-watch UI — not afterthought widgets.
Strava
Strava, both directions.
Connect once. Outdoor runs auto-upload as GPX, indoor runs as manual activities. And your back-catalog imports the other way — so the training science has real history to work with from day one, not an empty graph.
Sensors
External HR straps, paired.
Don't trust wrist optical at threshold? Pair a Bluetooth chest strap or arm band straight to the watch. The zone bar and every HR metric read from the strap the moment it connects — the pre-run check confirms the source before you start.
Built for runners.
By runners.
If you do tempo runs, intervals, long runs, and chase a finish-line time — RunToMax was built for you. Not for casual joggers. Not for step-counters. For the runner who already knows what Zone 2 means and just wants the watch to keep up.
Train like a runner.
On the watch you already own.
We're shipping in 2026. Waitlist members get early TestFlight builds, lifetime founder pricing on Pro coaching, and a hand-numbered first-1000 badge in the app.
Built by runners. For runners who train.
“I run a 1:30 half and a 40-flat 10K. I've owned a drawer of running watches over the years. The watches were great. The apps that came with them were not. RunToMax is the running platform I always wanted on the watch I actually wear — race-watch-grade training, clean and simple, with a coach that builds a plan around your week, not a generic one.”
— Hidai, founder