Every sport you love,read as one signal.
Hytive combines supported workouts and recovery data into explainable estimates for training load, readiness, and which body systems may need more recovery.
In final beta on iOS. The App Store launch will be free. Download and paid access are not yet live.
Load balance, readiness, and estimated fatigue by body system.
How it works
Plan, capture, then make a clear next choice.
Plan the week, record or import supported sessions, then inspect what the model estimates and why. Manual entry remains available when a workout is not in Apple Health.
Plan the week
Lay out sessions across supported sports in one place and preview their estimated load before you commit to the week.
Record or import
Record a session with supported Bluetooth sensors, import permitted Apple Health data, or add a session manually.
Read and choose
Inspect estimated load, readiness, and body-system fatigue, then compare suggested sessions and the reasons behind them.
What Hytive returns
One workout history, three useful views.
The current model turns supported sessions and recovery inputs into a load balance, a readiness estimate, and estimated fatigue across eight body systems. Each view exposes the inputs or rules behind it.
Your recent training measured against your longer-term norm. It waits until there are at least 14 days of history, then shows whether recent load is below, close to, or above that baseline.
One 0-to-100 estimate, weighted toward heart-rate variability and balanced with sleep and resting heart rate against your own baseline.
Estimated fatigue by body system
illustrative climb-and-run exampleLegs
model half-life: 24h
Push
model half-life: 24h
Pull
model half-life: 24h
Grip
model half-life: 28h
Core
model half-life: 24h
Aerobic
model half-life: 12h
Anaerobic
model half-life: 8h
Impact
model half-life: 72h
Suggested next sessions
illustrative outputZone-2 ride
GoLeans on your fresh aerobic system with almost no impact, and spares the grip and pull you taxed climbing.
Technique swim
ModerateLight, controlled volume that keeps you moving without piling onto an already busy week.
Pilates or an easy walk
RecoverReadiness is low this morning, so a gentle day will give back more than a hard one would cost.
Raw Apple Health data and precise route series
Necessary summaries, access controlled
Raw health data stays on your iPhone.
The training model runs on your device. Hytive syncs the necessary workout summaries and derived values used by the service, not raw Apple Health data or precise route series.
Raw health data stays on your device
The training model runs on your phone. Only the small derived values needed for your signal sync to access-controlled servers in the EU.
No advertising or third-party analytics
Hytive carries no advertising SDKs and no third-party analytics. Your health data is never used for marketing and never shared for anyone else's purposes.
Yours to take or erase
Export your available Hytive data or start account deletion inside the app. The flow reports any external cleanup it cannot confirm.
Method
How the estimates are calculated.
The current training model is deterministic. Published sports science informs its structure, while sport demand vectors and recovery half-lives remain clearly identified expert estimates.
Cross-sport load
Hytive applies a documented demand profile to catalogued sports, then adds their estimated load across eight body systems.
Deterministic and explainable
Same inputs, same output. Recommendations identify the inputs and documented model rules that shaped them, so you can inspect the reasoning.
Published research and explicit estimates
Published physiology informs the model. Sport demand vectors and recovery half-lives remain documented expert estimates, then results are normalised to your own baseline.
Acute:chronic workload ratio
Gabbett, 2016 · Hulin et al., 2016
7-day log-rMSSD HRV readiness
Plews et al., 2013
Session-RPE load · monotony · strain
Foster, 1998
Tissue-specific recovery half-lives
Clarkson & Hubal, 2002 · Magnusson et al., 2010
The load balance is a guide to how your training compares to your norm, not a clinical injury predictor.
Read the methodology and all 13 referencesLaunching free on iPhone.
There is no download or checkout on this website yet. The download link will appear after App Store approval. No payment or subscription is required for launch access.
Current state
Final beta for iPhone. Download and paid access are not live.
Launch product
The deterministic training model, supported imports and recording, body-system estimates, and cross-sport suggestions.
Launch access
Free during our launch period. Hytive will introduce subscriptions later. No date has been set. We’ll explain the price and any changes to access in advance. You’ll only pay if you choose a subscription.
Future AI
Not part of the current beta or launch offer. Any later coaching layer will be reviewed and described before release.
In final beta on iOS. The App Store launch will be free. Germany is the current intended release market.
Four useful answers.
Do I need an Apple Watch?
No. With your permission, Hytive reads supported data types from Apple Health, whether they came from an Apple Watch, a compatible source or the iPhone. You can also add a session manually.
Does my health data leave my phone?
Raw Apple Health data and precise route series stay on your device. Necessary workout summaries and derived values sync to access-controlled servers in the EU. The app provides export and account-deletion controls and reports external cleanup it cannot confirm.
Is this injury prevention or medical advice?
No. Hytive gives training estimates to help you balance effort and recovery. The load ratio is a guide to how your training compares to your norm, not a validated injury predictor, and not a substitute for professional medical advice.
Which sports does it cover?
Catalogued sports use a modelled demand profile across eight body systems. An uncatalogued activity uses a balanced full-body fallback estimate, so it does not receive the same sport-specific treatment.