Derived Coming soon
Derived app icon

See what training
does to you.

Derived reads years of workouts and health data from your iPhone and Apple Watch, and shows how your sleep, HRV and resting heart rate move with the work you put in. Every number is computed on your iPhone. None of it leaves.

Coming soon to iPhone Take the tour
Calendar: weeks of sessions with daily load, form and body signals
Today: training load, form, and resting heart rate, HRV and sleep against their usual range
A ride with power, heart rate and its route

Training apps know what you did. Apple Health knows what happened to you. For years, nothing put the two side by side. Derived does.

Built on evidence

Every number
shows its work.

Tap any figure to see the formula, the inputs, the sample size and the range around it. When there is not enough data yet, Derived tells you, and tells you how many more days it needs.

n = 214

Sample size. Uncertainty. Always.

Every result carries the days behind it and the range around it. No naked averages, no mystery scores.

“No effect” is an answer.

When your data shows nothing, you hear exactly that, with the same weight as a result.

Fitness, fatigue, form.

Session load from power, heart rate or pace, rolled into the long and the short view of your training.

W′

Your reserve, second by second.

Critical power and W′ from your own best efforts, and W′ balance drawn on every ride with power.

1 s

Every second, kept.

Power, heart rate, cadence and speed at full resolution, from Apple Watch, your bike computer or a FIT file.

Summaries, written on your iPhone.

Apple’s on-device language model writes your weekly summary from numbers Derived has already computed. It never makes one up, and the app works fully without it.

Ride. Run. Swim.

Every sport, honestly.

Full modeling for cycling, with running, trail and rowing next. Analysis for pool swimming and triathlon. For everything else, exactly what your watch can measure, and nothing it can’t.

A tour

One app.
Years of you.

Today

Your morning, at a glance.

Training load, form, and where your resting heart rate, HRV and sleep sit against your own usual range. No score, no verdict. Just how far today is from normal, for you.

Today: body signals against their usual range

Workouts

A ride, read completely.

Power, heart rate, cadence and speed at one-second resolution. Weighted power, intensity, decoupling, time in zones, W′ balance and the route, in one scroll.

Workout charts: power, heart rate and cadence

Metrics

Trends that respect the noise.

Resting heart rate, HRV, sleep, VO₂ max and weight, each against your own baseline with its range. Never against a population.

Metrics: daily body signals and their trends

Every day

A day, and the night after it.

Tap any day for its sessions, its load and form, and the resting heart rate, HRV and sleep that followed, each beside its usual range.

A day: its ride, load and form, and the body signals that followed

Findings

The questions you
always asked yourself.

Derived runs a battery of analyses across your whole history and keeps the results that hold up: how your HRV moves after hard weeks, how sleep follows big days, how resting heart rate tracks load. Each with its effect size, its confidence and the days behind it.

Does my HRV drop in big weeks? Above what load does my sleep slip? Which season balanced load and recovery best? What did the ten days before my best race look like?
Findings: results that held up across the athlete’s history
HRV over the season, with what moves it
Simulate: the next race, counted down, with its course
Simulate: a race plan with power, weight, bike and weather

Simulate

Race it before
you race it.

Load a course, set your plan, and Derived projects your time from your own critical power and W′, with a range instead of a single guess. After the race, the projection is scored against what happened.

Your physiology, not a template

Critical power and W′ from your own best efforts, refreshed as you train.

Physics you can check

Gravity, rolling resistance and air, segment by segment, from published equations.

W′ on every climb

See what each climb takes from your reserve at the power you choose, and what is left for the finish.

A model that keeps score

Every projection is compared with the result. Derived shows you its own error.

Your data stays
on your devices.

No account to create. No server to trust. Derived computes everything on your iPhone, and the only copies of your data are the ones you make.

0accounts
0servers holding your data
0analytics or ads in the app
Data Not Collected The developer does not collect any data from this app.

Connections to other fitness platforms, when they arrive, will open only when you ask, with data flowing straight between your iPhone and the platform. Sharing with a coach in Derived Pro will be an encrypted copy that you sign, scope and can revoke at any time.

Works with

Everything comes in.
Everything can go out.

Apple Health

Workouts, heart rate, HRV, sleep, VO₂ max and body measurements. Years of them, read in one pass.

Apple Watch

Every workout and every night it recorded, at the resolution it recorded them.

FIT, TCX and GPX

Files from any bike computer or platform, including structured workouts and routes.

Your Mac

The companion app keeps a read-only copy of everything, paired with your iPhone over your own network.

Fitness platforms Coming soon

Connections to third-party training platforms, so your sessions move where you need them.

Full export

Everything you have, in open formats, whenever you want it. Your history is never held hostage.

Pricing

Everything Derived does.
Your Mac included.

One subscription opens every screen, every analysis and the Mac companion app. Derived Pro, for coaches, is on its way.

Derived

€79.99 / year

or €9.99 a month. Mac companion app included.

  • Years of Apple Health and Apple Watch history
  • FIT, TCX and GPX import
  • Calendar, workouts and daily metrics
  • Findings across your whole history
  • Simulate, with every projection scored
  • W′ balance, routes and session fueling
  • The Derived companion app for Mac
  • Full data export, always

Derived Pro

Coming soon

For coaches.

  • Everything in Derived
  • A coach console on Mac
  • Your athletes, side by side
  • Each athlete shares an encrypted copy they sign
  • Read-only, and revocable by the athlete at any time

Prices in euros; the App Store shows them in your local currency. Your data stays on your devices, and you can export all of it at any time.

Know what your
training does.

Derived is coming to iPhone, with a companion for Mac.

Coming soon on the App Store

Requires iOS 18 or later. Best with a few seasons of Apple Watch data.