Short-range shape
Recent HRV readings stay close to the surface, useful for spotting the shape of a day as it develops.
Apple Watch + HealthKit HRV
hrv/spark
Your HRV. Raw. Beautiful. On your wrist.
HRVSpark turns your HealthKit heart-rate variability samples into calm, glanceable watch-face sparklines. No readiness score. No stress label. No verdict between you and the signal.
Built for glanceable raw HRV
10
Complications
Multiple watch-face formats.
4
Windows
Short and longer-range views.
0
Stress Scores
No algorithmic verdict layer.
1
Private Signal
Your HealthKit data stays yours.
A window, not a verdict.
The line matters more than the label.
Heart Rate Variability can be a useful window into recovery, strain, and autonomic state. But
the moment a product turns that signal into a score, color, or warning, it starts shaping how
you feel before you have even looked at the data.
HRVSpark takes the quieter path. It puts the raw HRV shape where you can see it repeatedly: on the Apple Watch face you already check all day.
You bring the context. The app brings the window.
The instrument
Designed for noticing, not reacting.
HRVSpark is deliberately calm: high contrast where it helps, soft glow where it belongs, and
no color-coded judgment attached to the value. The watch face becomes a small instrument
panel instead of a daily report card.
Glance
A small sparkline shows the shape, while the large number keeps
the latest value readable.
Tone
Neutral presentation reduces the urge to chase a colored score
or outsource intuition to someone else's algorithm.
Place
The complication lives beside the time, date, and activity data:
available when you want it, quiet when you do not.
HealthKit in view
Four windows, one honest source.
Daily texture
A full-day window helps separate single readings from the broader rhythm of sleep, work, movement, recovery, and intervention.
Weekly baseline
The seven-day view makes repeated patterns easier to notice without turning them into a score.
Longer arc
A month of raw values gives context for drift, recovery phases, and the conditions that move your numbers.
Design philosophy
Your raw data is the authority.
"I always drift up and vary a lot while sleeping. The numbers always crash after hot yoga. They go up with tvTENS on my ear. They go WAY up with a cold shower or ice plunge. I wanted to be able to see THAT — not an opaque interpretation."
- developer
Analysis appsReadiness score
HRVSparkRaw SDNN value
Analysis appsColor-coded verdict
HRVSparkNeutral sparkline
Analysis appsProprietary interpretation
HRVSparkHealthKit data in view
Analysis appsTell you what to do
HRVSparkShow you what happened
Who it is for
People who already bring context.
The self-experimenter
You are already tracking sleep, recovery, breathwork, training, cold exposure, or stress. You want a cleaner window into the signal.
The HRV veteran
You may use deeper analysis tools, but you still want one watch-face view that simply shows the raw data.
The anxiety-conscious
You do not need a product telling you whether today is good or bad before your feet hit the floor.
The data-over-decoration type
You care about the shape and the value. Everything else should earn its place.
Simple pricing
Try it free. Unlock once.
Free to download and try. $2.99 one-time unlock for Pro. No subscriptions, no accounts.
