Erkan
Open web app

Beta Web app open. iPhone and Watch in testing.

Know your normal. Then read today against it.

Erkan turns your wearable's sleep, heart and training data into daily Recovery, Strain and Sleep scores, each measured against your own last 28 days, with the working shown behind every number.

Open the web app How scores work
  • Free scores, no card
  • Try every screen on demo data
  • Export or delete any time

Your data, in one place

Bring the watch you already wear.

Erkan reads from the health stores your devices already write to, and adds what no watch measures: meals, habits and blood results. Here is exactly where each source stands today.

Web app

Every screen in the browser, installable on Android and desktop.

Available

Meals, journal and labs

Log food, daily factors, mood and blood results by hand.

Available

Apple Health

The Erkan iPhone app reads one row per day from Health, with background updates and a one year first import.

In testing

Apple Watch

A glance at today's scores, fed by your iPhone.

In testing

Fitbit and Pixel Watch

Google Health sync is built and waiting on its first real connection. Tokens will never reach your browser.

Coming soon

Health Connect

An Android companion for devices that write to Health Connect.

In testing

Garmin and Oura

On the roadmap. Not built yet.

Planned

Three scores, one call

Every morning, a straight answer.

Recovery says how much you have in the tank, Strain tracks what you spend, and Sleep tells you whether last night paid you back. Together they make the day's call.

Recovery

How ready your body is to take load today.

Strain

Today's training and movement, against your own history.

Sleep

Did last night cover what you needed?

Screens show example data. Read how each score is built

72RecoveryPrimed8 vs usual

Reading the dial

A number means little without your usual.

  1. The scoreToday's value from 0 to 100, drawn as one solid arc over a ruler.
  2. Your usual bandThe faint outer band is your normal range: your 28-day average, give or take one spread.
  3. The notchA small mark at your average, so you can see at a glance which side of it you are on.
  4. vs usualHow many points above or below your average today sits. Plus 8 for you might be a big day.

Beyond the three scores

The rest of the picture.

Energy across the week, daytime stress, what your blood says about how you are ageing, and the habits that move the needle.

Intelligence · Premium

Ask why. Get an answer from your own numbers.

Intelligence explains your scores in plain language and suggests what to do next. It can only use numbers Erkan has already computed, and every number in its answer is checked before you see it.

  • Sees 14 days of scores, baselines, meals, flagged labs and today's journal. Never your name, email or notes.
  • Refuses to diagnose, and falls back to Erkan's rule engine if an answer fails the check.
  • Up to 50 questions a week on Premium.
How Intelligence works

How Erkan is built

Four rules we do not bend.

Your baseline, not an average

Every score compares you with your own last 28 days, weighted toward recent nights. Scores stay hidden until there are 7 days of data.

Every number explained

Each score has a How it's scored sheet with its inputs, bands and formula. Nothing is a black box.

Missing is missing

A value that was not measured shows as a dash, never as zero or a made-up default that would quietly bend a score.

Facts before AI

A fixed engine computes every number. Intelligence can only explain numbers the engine produced, and a guard checks that it does.

Privacy

Health data is yours. We treat it that way.

Privacy and security
  • Your rows, only yoursRow-level security on every table: the database itself only returns rows that belong to you.
  • Tokens stay on the serverDevice and Google tokens never reach your browser.
  • No identity sent to AIIntelligence gets numbers, not your name, email or notes.
  • Leave whenever you likeExport every row as JSON, or delete your account and everything in it.

Pricing

The scores are free. Always.

Premium adds Intelligence and biological age for ₹299 a month or ₹1,999 a year, with a 7-day trial. During the beta, signed-in accounts get Premium free.

Compare plans

Questions

Good to know.

More on the questions page, or write to vikram@seigotic.com.

What do I need to use Erkan?

A wearable that records sleep and heart rate. Today the web app shows every screen on demo data and takes manual logs. Device sync is not open yet: Apple Health and Health Connect are in testing, and Fitbit and Pixel Watch come next.

Why compare me with myself instead of with other people?

A resting heart rate of 58 can be great for one person and a warning sign for another. Your own recent history is the most useful reference for whether today is normal for you.

How long until my scores appear?

Scores need 7 days of data to build a first baseline and settle after 14. Until then Erkan shows your raw numbers and says the baseline is still forming.

Is Erkan a medical device?

No. Erkan helps you understand trends in your own data. It does not diagnose or treat anything. Talk to a doctor about symptoms or lab results that worry you.

What does Intelligence see?

The last 14 days of your scores and baselines, a nutrition summary, flagged lab values and today's journal. It never receives your name, email or notes.

See your own normal.

Open the web app to explore every screen on clearly labelled demo data. Sign in with Google to log meals, habits and labs; your own scores arrive when device sync opens.

Open the web app See pricing

The iPhone and Apple Watch apps are in testing and not yet on the App Store.