Grain
Readiness intelligence for endurance and hybrid athletes. One score. One decision.
The Problem
Athletes have HRV monitors, sleep trackers, and resting heart rate data. The data exists. The problem is that it lives in five different apps, none of which talk to each other, and none of which answer the one question you actually need answered at 6am: should I train hard today, or not?
The result is either ignoring the data entirely, or spending 20 minutes cross-referencing Garmin, Sleep Cycle, and HRV4Training before making a gut call anyway.
The Solution
Grain takes the three signals that actually matter — heart rate variability, resting heart rate, and sleep quality — and synthesises them into a single daily readiness score.
Not a dashboard. Not five graphs to interpret. A score. And a recommendation: push, moderate, or recover.
Built for athletes who train consistently, recover deliberately, and want to make better decisions without adding more complexity to the morning routine.
- PlatformiOS
- Data sourcesApple Watch, HealthKit
- AvailabilityTestFlight
- TargetEndurance / hybrid athletes
- NextTrain integration
Input signals
- HRVHeart rate variability (ms)
- RHRResting heart rate (bpm)
- SleepDuration + quality
Output
- Score0–100 daily readiness
- RecommendationPush / Moderate / Recover
- Trend3-day and 7-day direction