Every heartbeat, night and workout your Watch measures, rendered live on your iPhone, with a private copy in a database on your own Mac.
A near-black room lit by one warm ember light and one cool aqua light. Every screen has a real 3D object built from your data, and the glass panes tilt as you move and catch the same light.
486/ 620 kcal
34/ 30 min
9/ 12 hr
Live heart rate on a chrome orb that beats at your pulse. Below it: Activity rings in 3D, last night's sleep, eight vitals with a week of trend, and your latest workout.
7h2masleep
The night as floating lit blocks: time runs left to right and deeper sleep sits lower. Step back through two weeks of nights and see how each one stacks up.
50–118bpm
Today
Heart rate, HRV, steps, blood oxygen and the rest, from a single day to a full year, as lit 3D columns. Drag across them to read any hour, day or week. Try it above.
42m
avg 152 · max 178 bpm
Distance, pace and energy for every session, and heart rate as a skyline that runs from cool to hot.
The copy on your Mac, as a stack of chrome discs. It syncs in the background whenever your Watch hands new data to your iPhone.
Heart rate, sleep stages, workouts and more land in Apple Health on your iPhone, the way they always do.
When new data arrives, iOS wakes the app in the background. It sends only what's new since the last sync.
A small Python server writes everything into one SQLite file that you own.
Open localhost:8787 for the dashboard, or point any SQLite tool at health.db.
Pulsar never writes to Apple Health. It reads only the types you allow, and you can switch any of them off in Settings.
Data goes from your iPhone straight to your Mac. There's no Pulsar server in the middle, because there isn't one.
Your Mac only accepts uploads that carry its secret token. The dashboard and read API answer only the Mac itself.
Everything is in health.db. Back it up, open it in any SQLite tool, or delete it. It's yours.
Add Tailscale on both devices to sync from anywhere. Anything missed is sent the next time your Mac is reachable.
Steps, energy and distance use HealthKit's de-duplicated daily totals, so they match the Health app.
Screenshots from the iOS Simulator with demo data.
Background timing is up to iOS. Heart rate usually arrives within minutes; steps and energy at most hourly. Nothing syncs while the phone is locked right after a restart. The app's log shows exactly when each sync happened.
Only for data to arrive. When the phone can't reach the Mac, nothing is lost: everything missed is sent the next time it can.
Yes. Install Tailscale on your Mac and iPhone and use the Mac's Tailscale address as the server. Syncing then works from anywhere.
Raw sensor streams, such as the optical heart-rate signal or the accelerometer. Apple doesn't make them available. You get the processed values Apple stores in Health.
No. It shows and stores the data Apple Health already has. It doesn't diagnose anything or give medical advice.
Pulsar isn't out yet. Leave your email and you'll hear the moment it's ready to install.
One email when Pulsar is ready to install. Sign-ups are handled by Formspree.