PAVEL

Live demo · 2026

Signal

Your health data, ready for your doctor.

Try the live demo(opens in a new tab)Watch the film1 min 7 s
All data in the film and the demo is synthetic.

01The problem

Doctors look at wearable data. Few have it in their workflow.

Review it

97%

of surveyed physicians review patients’ wearable data in some way.

Have it in their workflow

6%or less

of physicians, in every surveyed country.

Barriers they named

Data reliabilityClinical workflowReimbursementLiability

Source: AMA, International Physician Survey on Consumer Wearables, July 2026. 2,222 physicians in six countries.

02Where I could help

One part is up to the patient.

  1. 1

    A device records

    Every day, with gaps.

  2. 2

    A person notices

    Something feels different.

  3. 3

    An appointment

    Minutes to explain it.

  4. 4

    The clinical record

    Run by health systems.

Signal works on steps 2 and 3.

03What I tried

Four ideas. One fit.

Send data into the clinic's record

Out of scope

Decided by health systems, not an app.

An AI summary of the numbers

Rejected

Interpreting health data is a doctor's job.

A better dashboard

Rejected

More charts. Same problem.

A one-page brief you approve

Built

Changes what arrives at the appointment.

Five rules every screen follows

  1. 1Show where every number came from.
  2. 2Never fill a gap.
  3. 3Describe. Don't interpret.
  4. 4You decide what's shared.
  5. 5It fits on one page.

04The product

The product

01Notice

See what changed.

30 days of resting heart rate. Missing days stay visible.

Explore on a phone: resting heart rate over the last 30 days, averaging 59 bpm. The 30 days option is selected, and three days in mid-October are hatched where there is no data.

02Add context

Add what the numbers can't show.

Your words, kept exactly as you wrote them.

Add observation on a phone, filled in: 'Waking around 3am most nights and finding it hard to get back to sleep', with Sleep duration selected as the related measurement.

03Share

You approve every page.

Nothing leaves until you tick “I've read this brief.”

The bottom of the brief review on a phone. 'I've read this brief' is ticked, and the Download PDF and Share buttons are now available.

One page.

The exported one-page brief: a demo banner, the period, resting heart rate, sleep and steps with charts, averages, ranges and sources, what the person noticed, questions for the clinician, the limitations of the data and a note that it is not a medical record or diagnosis.
The exported PDF. Demo data.
PeriodTrendsSourcesWhat I noticedQuestionsLimitations

05Phone, tablet and desktop

A layout for each screen.

Observations on a desktop: a timeline of notes above resting heart rate, sleep and step charts for the same 30 days, and a side panel showing the selected observation with its context, question and the measurements recorded over the same days.
Home on a tablet: a navigation rail on the left and one column with the demo walkthrough, the resting heart rate card and the next action.
Home on a phone: resting heart rate at 60 bpm over 14 days, with Home, Explore and Brief in a bar along the bottom.

Desktop 1024 px+

Sidebar. Review side by side.

Tablet 768–1023 px

Navigation rail. One column.

Phone 360–767 px

Bottom bar. Full-screen notes.

The same brief on every screen.

Brief review on a desktop: the one-page brief on the left, and on the right the approval checkbox, ticked, with Download PDF and Share enabled.
Brief review on a tablet: the page preview fills the column, with the review controls below it.
Brief review on a phone: the steps to Review and share at the top, then the page preview scaled to the screen.

06How it’s built

Light and dark. Same rules.

The desktop overview in Signal's light theme.
The same overview in Signal's dark theme: charcoal surfaces, light sage accents, the same layout.
Dark follows the device setting.
43
unit tests
14
designed states
4.5:1
minimum text contrast
0
AI on health data

WCAG 2.2 AA. Optional sync with row-level security. Installable, with no health records in the offline cache. React, TypeScript, Vite, Tailwind CSS, Recharts, Motion, Supabase, Vercel.

07Limits

What Signal won’t do.

  • Diagnose or score risk
  • Explain symptoms or causes
  • Use AI on health data
  • Connect to clinical records
  • Claim better outcomes
  • Replace urgent care

08What I’d measure next

Less sorting. Clearer appointments.

The goal, not a result. Not yet tested with patients or doctors.

01Time to a finished brief

02Briefs approved and shared

03Read by a doctor in 30 seconds

04Briefs with the person's own words

Try it with demo data.

No account needed.

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Signal is an independent product exploration. It is not a medical device and is not affiliated with the AMA, Google, Fitbit or Apple. Research, product and interaction design; built with Claude Code.

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