Heart
An HRV tracker that actually interprets what it sees.
Most apps show you HRV as a single number and call it a day. Wellness Project reads it against your 30-day baseline, your training load, your sleep, and your alcohol intake, then tells you whether to push or pull back today.
Free · Now on iPhone · Syncs Apple Health, Fitbit & Oura
What's inside
HRV interpretation that doesn’t require a degree
Daily HRV
Pulled from Oura and Fitbit directly, and from Apple Watch (or any other wearable that writes to Apple Health) on iOS. Plotted against your personal 30-day baseline so today’s reading has meaning.
Resting heart rate
Same source, plotted with HRV inverted. RHR up + HRV down = stressed; RHR down + HRV up = recovered.
Recovery score in Fit Score
Your daily Recovery component is built from HRV and RHR vs your 30-day baseline (HRV weighted slightly heavier). It sits inside the Fit Score alongside Train, Sleep, Fuel, Steps, and Wellbeing.
Variance & trend
7-day rolling baseline, 30-day baseline, and the gap between them. A widening gap is when something is changing, and Max will say so.
Cross-correlation insights
"On nights you sleep under 7h, HRV drops 4ms vs baseline. Eleven of those in the last 30 days." Real Max-style replies.
Multi-device dedup
HRV methodology differs across devices. When multiple sources log the same day, Wellness Project picks one and dedupes the rest so the trend stays comparable.
In the app
The single most useful daily metric, finally usable
HRV is the cleanest single proxy for autonomic-nervous-system state, the gap between sympathetic stress and parasympathetic recovery. Reading it well means knowing your personal baseline, what training you did yesterday, what you ate, what you drank, and how you slept.
Wellness Project does that read automatically. The biohacker, Max Kline, reads HRV against your training load, alcohol, sleep, and stress in one pass. The output isn’t “HRV is 47, that’s good or bad?” It’s “HRV ran 8% below your 30-day baseline three days running, Tuesday late HIIT and last night’s alcohol both fit; cut one or take a true rest day.”
Same data feeds Evelyn’s longevity reads (lower HRV is broadly associated with cardiovascular risk in observational research), Elias’s training decisions (low HRV days bump easy runs), and Coach Jamie’s workout-load suggestions.
From the blog
Related posts from the crew
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Max Kline · May 4, 2026
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FAQ
FAQ
Apple Watch vs Oura, which is best for HRV?
Is HRV actually predictive?
Why does my HRV crash on weekends?
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Keep exploring
Coach
Meet Max Kline
The biohacker who reads HRV like a stock chart. Engineer-minded, allergic to over-interpretation.
Read moreIntegration
Oura Ring
The richest sleep + HRV dataset of any consumer wearable. Fully integrated.
Read moreUse case
For biohackers
How quantified-self users interrogate HRV alongside sleep, CGM, and supplements.
Read moreStart tracking. Talk to your specialists today.
Free · No credit card · iPhone, Android, web
Wellness Project is informational software, not a medical product. AI advisors do not diagnose, treat, or prescribe; for anything clinical, consult a qualified clinician.