The blood‑pressure diary your doctor asked for.
Whether your doctor wants home readings or you're keeping track on your own: log each measurement in seconds, see the averages that matter, and bring a clear report to your next appointment.
Free. No password: we email you a code. Under a minute to your first reading.
SysdiaHow it works
Three readings. One session. No menus.
A proper home measurement is two or three readings a minute apart. Sysdia is built around exactly that, so logging never takes longer than measuring.
Type, and it moves on
Enter the three numbers from your monitor. The cursor jumps to the next field by itself, and Save is always in reach.
Readings become a session
Readings taken within a few minutes of each other are grouped and averaged, so one odd reading doesn't set the tone.
The trend, not the noise
Morning and evening averages, a 7-day figure, and one clear chart, from a week back to your first reading.
The week before the appointment
Asked to measure for a week? Sysdia keeps count.
The home protocol in European guidelines is two readings every morning and every evening for seven days. Sysdia shows which days are complete and works out the 7-day average from them, ready to hand over.
For your doctor
A report built to be read in a minute.
Many diary apps charge for the doctor's report. In Sysdia it's free, for any range you choose.
AI assistants
Ask ChatGPT or Claude about your readings.
Say the numbers and they're logged. Ask how your week went and get your real averages, not a guess. You decide whether it may only look, or also add and change readings.
Talk, don't type
“Log 128 over 82, pulse 70” is enough. With Claude, you get the session’s average straight back.
Your numbers, not guesses
It reads the same averages and 7-day figure your doctor's report uses, in your own time zone.
You hold the key
Connect it with a key from Settings, read-only if you like, and revoke it any time. The assistant's company sees the readings you let it read.
Privacy
Free, and yours.
Your readings are health data, and Sysdia treats them that way. No ads, no premium tier, and no trackers, on this page included.
Free, all of it
Every feature, the doctor's report included. No trial and no upsell.
No password
Sign in with an 8-digit code sent to your email. Nothing to remember, nothing to leak.
Kept in the EU
On one server in Helsinki, with an encrypted copy every night in Frankfurt. Sign-in emails go out from Paris.
No trackers
No analytics, no ad pixels, no cookie banner. The only cookies are the ones that sign you in and remember your language.
Export everything
Every reading as a spreadsheet file, any time, from Settings. Your data is never locked in.
Delete in one step
Your account and every reading, removed from Settings, straight away.
On your phone, like an app
Open sysdia.app and add it to your home screen. No app store and no updates to install. It works on a computer too, in light or dark.
Is it really free?
Yes. Every feature, the doctor's report included. No ads, no premium tier, no trial that runs out.
Is Sysdia a medical device?
No. It's a diary: it records what your monitor shows, averages it and lays it out clearly. It doesn't sort your readings into categories, diagnose anything or tell you what to do. That's your doctor's job.
Which blood-pressure monitor do I need?
Any home monitor. You type the numbers in, so there's nothing to pair or connect.
Does it work on iPhone and Android?
Yes, in the browser on any phone or computer, and you can add it to your home screen like an app.
Who can see my readings?
You, and any assistant or program you connect with a key. They're never sold, shared or used for advertising. Besides the copy on your own devices, only an encrypted backup ever leaves the server in Helsinki — unless you connect an assistant yourself.
Can I use it with ChatGPT or Claude?
Yes. Create a key in Settings and connect Claude Code or a custom GPT in ChatGPT; the steps are on one page. The assistant can read your readings and, if you allow it, add and change them. How to connect →
Can I take my data elsewhere?
Any time. Download every reading as a CSV file from Settings, or a PDF for any date range.