Critical Power Model
312W
CP · 4.05 W/kg
18.4kJ
W′ · anaerobic reserve
R² 0.99412 data points · 2-parameter fit
Critical Power & W′
A true hyperbolic CP model instead of FTP guesswork, backed by quality gates and breakthrough detection.
Founding Members · first 200 only
Every day, the training that fits you now.
For ambitious cyclists and runners: trace reads every session and your health data, adjusts your training plan to it, and explains every decision it makes.
The cockpitA dashboard
A dashboard
that thinks ahead.
Readiness, form and your weekly plan at a glance – on desktop and on the go.
Felix
PRODashboard
Your training overview
Good afternoon, Felix
Your recovery numbers hold up and your form is positive.
Check-in
82
RecoveredCoach
Readiness 82, clear for quality.
Form +12 (fresh), today's plan fits. Give the intervals a clean warm-up.
Open trainingToday's training
Endurance, extensiveZ2 · Endur.
2h 15min · ~67.4 km · ~101 TSS
Training balanceTotal
DetailsFitness · CTL
84
Ambitious
Fatigue · ATL
72
Moderate
Form · TSB
+12
Fresh
ProductiveFresh
ACWR
0.86
Optimal
Ramp
3.8
Optimal
Monotony
0.9
Healthy
Now on the App Store
trace for your iPhone
Your whole training in your pocket: readiness when you wake up, the plan before you head out, the debrief right after the session.
The appFive screens,
Five screens,
one training day.
The full analysis on your phone, not a stripped-down version.
Dashboard
Your training, finally understood.
All your data in one place. Your form at a glance.
Training load
Stay on top of form, fitness and fatigue.
The training load curve the pros use, updated automatically every day.
Activity
Every session in full detail.
W′bal, aerobic efficiency and AI insights for every ride.
Training plan
A plan that adapts to you.
Every session with its flow, zones and targets.
Coach
A coach that knows your data.
Questions about training, answered instantly.
Dashboard
Your training, finally understood.
All your data in one place. Your form at a glance.
Training load
Stay on top of form, fitness and fatigue.
The training load curve the pros use, updated automatically every day.
Activity
Every session in full detail.
W′bal, aerobic efficiency and AI insights for every ride.
Training plan
A plan that adapts to you.
Every session with its flow, zones and targets.
Coach
A coach that knows your data.
Questions about training, answered instantly.
AnalysisThe tools only
The tools only
pros used to have.
trace brings sports science into your training: clear, automatic, every day.
Durability
93/ 100
Fatigue resistance
−7%
Loss after 3 h
freshafter 3 h0 – 4 h
Durability
How much power is left after three hours? trace compares your fresh and fatigued profiles and shows what decides races.
Readiness
Today
Ready
HRV
68 ms
Resting HR
48 bpm
Sleep
7:42 h
Readiness Score
Calculated automatically every morning from HRV, resting heart rate and sleep: push hard today or recover?
Heat acclimatization
68
/ 100
Well acclimatized
9 hot sessions (14 d)2 days ago
Heat acclimatization
trace turns the temperature and humidity of every session into a heat dose and shows how ready you are for a hot race day.
Ötztaler Radmarathon
Readiness
in 42 days
8:12 h · 243 W
Forecast · Pacing
KühtaiBrennerJaufenTimmelsjoch
Races
Prognosis, pacing, fuelling, taper: trace builds the whole road to race day – and gives you an honest debrief once it is done.
Who is it for?
Built for your sport
Whether you run three times a week or train every day – trace gives you the kind of insights that used to require a pro team around you.
Compatible with your devices
Garmin comes in through Intervals.icu: connect once, then it is automatic. A direct integration is in the works.
From the App StoreWhat athletes
What athletes
write about it.
MembershipStarter is free.
Starter is free.
Forever.
Try Athlete and Pro free for 14 days. The monthly plan can be cancelled at any time.
Starter
The way in, free and without a credit card.
€0 /mo
- Readiness score & daily session suggestion
- Form & load: full history and diagnostics
- VO₂max, zones, personal bests & season
Athlete
Full analysis and AI coach for serious athletes.
€6.99 /mo
- Critical Power, W′ balance & durability
- Running engine: critical pace & HR recovery
- trace Coach with 30 messages per month
Pro
Training plans, races and course simulation.
€12.99 /mo
- AI training plans with structured sessions
- Races: forecast, pacing, fuelling, taper
- Heat acclimatisation & course simulation
PrivacyYour health data
Your health data
belongs to you.
trace processes heart rate, HRV and sleep: special categories under Art. 9 GDPR. Anyone uploading that has a right to know beforehand what happens to it.
Our promise is short: your data belongs to you. We live off subscriptions, not advertising, and that is the whole reason this page can be this brief.
Read the privacy policyOur privacy promise
Stored in the EU
Database and sign-in run in Ireland, the app itself and your uploaded files in Frankfurt am Main.
No selling, no advertising
We do not sell your data and we do not use it for advertising. Health data is never passed to third parties for marketing.
Health data only with your consent
Heart rate, HRV and sleep are processed solely on the basis of your explicit consent under Art. 9 GDPR. Withdraw it any time in settings.
The AI is not trained on your data
For coach and insights, data-minimised values without name or email go to our processor. They are not used for model training.
The moment you've been training for.
trace gets you there.
Ready to truly understandyour training?
Connect your devices and see within two minutes what your recent sessions really mean.
14-day free trialOne of the first 200 founding spots