Derived
Derived app icon

See what training
does to you.

Derived reads your workouts and health data from Apple Health and shows how your sleep, HRV and resting heart rate change as your training load rises and falls. The analysis runs on your iPhone or iPad. No Derived server stores or reads your data.

Coming soon to iPhone and iPad 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

Your workouts are recorded in one place and your sleep and heart rate in another. Derived puts them on one timeline, so you can read them together.

Method

Every number
shows its work.

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

n = 214

Sample size and uncertainty on every result

Each result shows how many days it is based on and how wide its range is. Derived does not reduce your data to a single readiness score.

Results with no effect

If your data shows no relation, Derived reports that in the same place and format as a relation it found.

Fitness, fatigue and form

Session load from power, heart rate or pace, added up into long-term and short-term training load.

W′

Critical power and W′

Estimated from your own best efforts. Every ride with power shows how your W′ balance fell and recovered.

1 s

One-second data

Power, heart rate, cadence and speed are stored at full resolution, whether they come from Apple Watch, a bike computer or a FIT file.

A weekly summary written on your device

Apple's on-device language model writes the summary from numbers Derived has already calculated. It does not produce numbers of its own, and every feature works without it.

Cycling first

What each sport gets

Cycling has the full model, and running, trail running and rowing are next. Pool swimming and triathlon get the analysis. Other sports show the measurements your watch records.

Tour

The screens you
will use most.

Today

Where you are this morning

Training load and form, with your resting heart rate, HRV and sleep compared with your own usual range. Derived shows how far each value is from your normal and leaves the interpretation to you.

Today: body signals against their usual range

Workouts

Each ride in detail

Power, heart rate, cadence and speed at one-second resolution, with weighted power, intensity, decoupling, time in zones, W′ balance and the route on a single page.

Workout charts: power, heart rate and cadence

Metrics

Trends against your own baseline

Resting heart rate, HRV, sleep, VO₂ max and weight, each compared with your own baseline and shown with its range. Derived does not compare you with population averages.

Metrics: daily body signals and their trends

Calendar

Any day and the night after it

Tap a day to see its sessions, load and form, and the resting heart rate, HRV and sleep recorded afterwards, each next to its usual range.

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

Findings

Answers from
your own history.

Derived runs a set of analyses across your whole history, for example how your HRV changes after hard weeks or how your sleep changes after long days. Results are corrected for multiple comparisons, and only the ones that hold up are shown. Each finding lists its effect size, its confidence interval and the number of days behind it.

Does my HRV drop in hard 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

Project your time
on a real course.

Load a course and set your plan. Derived projects your finishing time from your critical power and W′ and gives it as a range. After the race, it compares the projection with your actual time.

Based on your own efforts

Critical power and W′ come from your best efforts and update as you train.

Published physics

Gravity, rolling resistance and air drag, calculated segment by segment with published equations.

W′ on each climb

How much of your W′ each climb uses at the power you choose, and how much remains for the finish.

Projection error

Each projection is compared with your result, and Derived shows how far off it was.

Your data stays
on your devices.

Derived has no accounts, and no Derived server stores your data. Everything is calculated on your iPhone or iPad. Copies of your data exist only where you put them, such as a paired Mac or an export file.

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

Derived connects to Intervals.icu, Polar, Strava and Wahoo only when you ask it to, and sessions go directly between that platform and your device. In Derived Pro, you will share data with a coach as an encrypted copy that you sign, limit in scope and can revoke at any time.

Works with

Sources
and export.

Apple Health

Workouts, heart rate, HRV, sleep, VO₂ max and body measurements, read in one pass however many years you have.

Apple Watch

Workouts and sleep recorded by your watch, at the resolution it recorded them.

FIT, TCX and GPX

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

Your Mac Coming in November 2026

The companion app pairs once with your iPhone and keeps a read-only copy of your data, updated over your own network. It is included in the subscription.

Training platforms

Sessions from Intervals.icu, Polar, Strava and Wahoo, with all their data streams, through a connection you approve.

Full export

All of your data, in open file formats.

Pricing

One subscription for
iPhone, iPad and Mac.

The subscription includes every screen and analysis on iPhone and iPad, and from November 2026 the Mac companion app, paired with your iPhone. Derived Pro for coaches follows in December 2026.

Derived

€99.99 / year

14-day free trial. Also €39.99 for three months with a 7-day free trial, or €14.99 a month. iPad and the 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
  • Derived on iPad, and the Mac companion app from November 2026
  • Full data export

Derived Pro

December 2026

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.

Made by Peakbits & Co.

Who makes Derived

Derived is made by Peakbits & Co., an independent studio that builds race analytics for professional endurance sport. The app runs on PerformKit, our own set of modelling engines. We use the same engines in our work with teams.

PerformTwin

Critical power and W′ from your own best efforts, W′ balance on every ride, and the projections in Simulate.

PerformCourse

Courses and climbs, from the GPX file to the segments the physics runs on.

PerformMetrics

Session load, fitness, fatigue and form, and the personal baselines behind Today and Metrics.

PerformAnalysis

The statistics behind Findings: correlation, change points, bootstrap intervals and false discovery control.

For professional teams

For teams, we build on the same engines: digital twins for a whole squad, race simulation with opponents, decision models for selection and race programmes, and small language models fine-tuned for team staff and run on a private cloud. We start with road cycling; athletics, road running and triathlon use the same foundations. We work with a few teams each season.

Only the engines are shared. Your Derived data stays on your devices and never reaches the studio.

Visit peakbits.co Email the studio

Coming to
iPhone and iPad.

The Mac companion app follows in November 2026 and is included in the subscription.

Coming soon on the App Store

Requires iOS 26 or iPadOS 26 or later. Best with a few seasons of Apple Health data.