Read the traces
your days leave.

Ichnos explains what your watch already records: how recovered you are this morning, how your sleep is going, where your training lands and what your habits do to you. Every number is compared with your own normal, and calculated on your phone.

Join the Android beta Try the recovery verdict
  • No account
  • No server
  • No analytics
  • Reads Health Connect, never writes

Any watch that syncs to Health Connect. Samsung, Pixel and Fitbit, Garmin, Xiaomi, Amazfit, Polar, Suunto, Withings, Oura, and Huawei through Health Sync.

Try it · Recovery

One verdict each morning,
and what it rests on.

Move last night's numbers and watch the verdict change. Each signal is judged against the same person's own recent history, not a population average.

Last night, made-up person

Usual: 7 h 20 min
60-night median: 52 ms
Usual: 51 bpm
Training in the last two days
How you feel

Recovery · this morning

Recovered

9RPE CEILING

    A simplified demo with invented numbers. The app weighs more signals (sleep regularity, overnight heart rate shape, cycle phase) and shows the method behind each one.

    Inside the app

    Everything your watch records,
    finally explained.

    Today screen: the recovery verdict and the daily log
    TodayYour verdict, how hard to go, and a thirty-second check-in.
    Sleep screen: last night with its stages
    SleepLast night against your usual nights, with timing and stages.
    Journal screen: a week of mornings
    JournalLog how you feel. Ichnos links it to your nights and mornings.
    Experiment result: caffeine cut-off, likely real
    ExperimentsTest a habit on yourself with randomised nights and one verdict.
    Muscles screen: a body map of trained muscle groups
    Training and musclesEvery sport in one log, and where your sets land.
    Body screen: fat and lean mass over 90 days
    BodyThe trend beneath the scale's noise, split into fat and lean.
    Bloodwork screen: a lab draw with its markers
    BloodworkImport a lab PDF, keep every marker's history.

    Try it · Bloodwork

    Did it really change,
    or is it just noise?

    Two lab results almost never match, even when nothing changed: your body varies from week to week and so does the lab. Ichnos tells you when a difference is bigger than both.

    Two draws, same lab

    Nothing you type leaves this page.

    How this is worked out

    The reference change value (Fraser, 2011): with the within-person variation CVI from the EFLM Biological Variation Database and lab imprecision CVA assumed at 0.5 × CVI, a change is outside normal variation when it lies beyond exp(±1.96·√2·σ) − 1, where σ = √ln(1 + CV²) and CV² = CVA² + CVI². Results from different labs are not compared. This describes your numbers and does not diagnose anything.

    Private by design

    Your health data
    stays on your phone.

    No account

    No sign-up, no email, no cloud profile, no advertising ID.

    Calculated on the phone

    Every number is worked out inside the app. There is no Ichnos server to send it to.

    Read only

    Ichnos reads Health Connect and never writes to it or changes your watch app's data.

    A log of what left

    Only what you share leaves, and the Privacy page lists every time it did.

    This website has no cookies and no analytics either. Privacy policy

    Android beta

    Help shape Ichnos
    before it launches.

    The beta runs through Google Play's own testing programme, so you install and update Ichnos from the Play Store like any other app.

    1. Join the testers group

      One click with your Google account. The group is how Play knows you may install the beta, and members get one email when it opens.

    2. Opt in on Google Play

      Open the test link and tap "Become a tester".

    3. Install and connect

      Install from the Play Store, then let Ichnos read Health Connect. Your history appears in minutes.

    Questions

    Before you ask

    Which watches work?

    Any watch whose app writes to Health Connect on Android: Samsung, Pixel and Fitbit, Garmin, Xiaomi, Amazfit, Polar, Suunto, Withings and Oura, among others. Huawei watches work through the Health Sync app. Hevy is supported for gym sets.

    Is there an iPhone version?

    No. Ichnos is built on Health Connect, which is Android only.

    Where does my data go?

    Nowhere unless you send it. Ichnos runs entirely on your phone. Android's backup to your Google account stays off unless you turn it on, and you can save your own backup file.

    Is it a medical device?

    No. Ichnos describes your data against your own normal. It does not diagnose, treat or prevent any condition.

    Who makes it?

    An engineer and researcher who wanted his own watch data explained honestly: every number with its method one tap away, and what was not recorded shown as unknown, never as zero.