Device Integrations
Your trackers feed the coach. The more data it has, the more specific the accountability.
How integrations work
The Callous Protocol syncs your connected services before every outbound message. No manual entry needed — your data flows in automatically. The coach sees what you ate, how you trained, how you recovered, and what the scale says, all before it writes a single word.
Connect one service or all five. The more data sources, the more context the protocol has to coach from.
Cronometer
NutritionProvides: calories, protein, carbs, fat, fibre, micronutrients, meal timestamps
The foundation of macro coaching. Cronometer's detailed food database gives the protocol exact nutritional data for everything you log. It tracks your running totals throughout the day, knows when you're front-loading or back-loading calories, and spots protein pacing issues before your evening check-in.
Syncs via Cronometer's API. Log your food in the Cronometer app as normal — the data appears in your coaching automatically.
Hevy
Strength trainingProvides: exercises, sets, reps, weight, volume, workout duration, muscle groups
Detailed strength training data. The protocol knows which exercises you did, your total volume, and whether you followed your programme. It tracks consistency across the week and flags when sessions are missed or truncated.
Syncs via the Hevy API. Log your workouts in Hevy as normal.
Strava
Cardio & enduranceProvides: activity type, distance, duration, pace, heart rate, calories burned, elevation
Running, cycling, swimming, hiking — any activity you track in Strava feeds into the coaching. The protocol factors cardio into your energy expenditure calculations and adjusts your daily coaching accordingly.
OAuth connection. Authorise once and activities sync automatically.
WHOOP
Recovery & sleepProvides: recovery score, HRV, resting heart rate, sleep performance, sleep stages, strain
Recovery context changes how the protocol coaches. Low recovery before a planned heavy session? You'll hear about it. The protocol uses WHOOP data to add a recovery dimension to training accountability — it's not just about whether you trained, but whether you should.
OAuth connection. Your WHOOP data syncs automatically each morning.
Withings
Weight & body compositionProvides: weight, body fat percentage, muscle mass, water percentage
Step on the scale and the data appears in your coaching. No manual entry, no forgetting. The protocol applies EWMA smoothing to your weight data, cutting through daily fluctuations to show the real trend. Body composition data feeds into the road model and recomposition tracking.
OAuth connection. Weigh yourself on a Withings scale and the data syncs within minutes.
Training reconciliation
If you use multiple training sources — logging strength in Hevy and running in Strava, with WHOOP recording both — the protocol doesn't double-count. A reconciliation engine deduplicates overlapping sessions across sources, so your coaching reflects what you actually did, not what three apps think you did.
Don't use any of these?
You can still use the protocol. Manual weight entry works through the web dashboard or WhatsApp. Meal photos can be analysed directly. But the more data you connect, the more specific and useful the coaching becomes.
Free weekly report. £1 first month, then £5/month. No contract.
Learn more: AI health coach overview · What is an AI accountability coach? · How the coaching pipeline works