What actually happens during a scan
No magic, no mystery — just a steady look and a little light. Here is the whole of it.
The thirty seconds
- 01
Frame your face
Open Linden and start a scan. The front camera frames your face in a soft oval — about an arm’s length away, in even light.
- 02
Hold still for thirty seconds
Linden watches the faint changes in the color of your skin — the subtle flush that rises and falls with each heartbeat. No contact, no wearable.
- 03
One number appears
It turns that rhythm into your resting heart rate — a single, trustworthy number, paired with one plain-language line about your day.
- 04
The video is deleted
Everything happens on your phone. The moment the reading is done, the video is gone — never stored, never sent.
Your video never leaves your phone. The scan is processed on your device and deleted. We never see your face.
On-device, always
The camera reads short video frames purely to compute a few numerical brightness averages. That math happens on your phone, the video is deleted, and nothing about your face is ever stored or transmitted. There is no account to leak, because there is no account.
Compared to your baseline, not a population average.
Your own normal
- Linden builds your baseline from your own mornings — a number only means something next to your own normal.
- Each day it shows how today compares to that baseline, in bpm, in words you can actually read.
- It offers one observation — “often a sign of good rest” — never a diagnosis, never a verdict.
- What you do with it is yours to decide. Linden stays calm and stays out of the way.
