Daily dose tracking
Log every dose in seconds. Confirm with the time you actually took it. Never wonder "did I take it today?" again.
For Warfarin · Sintrom · Coumadin
Take control of your blood‑thinner therapy.
INRythm is a simple, private tracker for your daily dose and INR results. Built by a heart-surgery patient — for everyone living with long-term anticoagulants — at any age.
Free, private by design. Encrypted in transit, never sold to third parties.
Built for people who can't afford to forget a dose
Three things, done well.
No bloat, no social feed, no ads. Track your dose. Track your INR. Get reminded. That's it.
INR results, visualised
Plot your INR over time and see at a glance whether you're inside your therapeutic range. Spot a trend before it becomes a problem.
Smart reminders
Notifications for your daily dose at the time that suits you, plus reminders for upcoming bloodwork checks.
FOR PATIENTS
An INR & dose log built for you
If you're newly on Warfarin or you've been managing therapy for years, INRythm gives you a calm, consistent record — and one less thing to worry about each day.
Read more → FOR CAREGIVERSHelp a loved one stay on track
Set up the schedule, share the export with the doctor, and breathe easier knowing the day-to-day is being recorded reliably. Turn on easy mode — larger text, logging in seconds — and the daily routine stays manageable without your help.
Read more →
A look inside
Designed to be glanceable.
Open the app, see your day, log your dose. The whole interaction is meant to take ten seconds.
Dashboard. Today's prescribed dose, your 14-day history, and your latest INR reading — at a glance.
Light mode too. Every screen respects your system theme. The data, the typography, the rhythm — all the same.
Therapy log. Every dose, every test, every missed day — the full month at a glance.
Tap any day. See exactly what you took, when, and the INR result — even months later.
Settings. Set your target INR range, reminder time, and check frequency once. Then forget about it.
ONE SWITCH, LESS SCREEN
Easy mode. The whole app, at a glance.
One switch turns INRythm into its simplest self: larger text, bigger buttons, fewer things on screen. Today's dose, your latest INR, one button to log — nothing else. Turn it on during setup or anytime in Settings.
Easy mode.
Standard.
Designed with older adults in mind. Loved by anyone who just wants less on their screen.
Built by a patient
One of us made it.
I created INRythm after my heart surgery. The doctors saved my life with an artificial heart valve, and now I take Sintrom for life. If you're reading this, there's a good chance you're on it too. INRythm is the simple, reliable tool I wished existed.
FounderIvan Georgiev
Works with every major anticoagulant
If your medication is a vitamin K antagonist, INRythm tracks it.
SintromAcenocoumarol
WarfarinGeneric
CoumadinWarfarin
MarevanWarfarin
MarcoumarPhenprocoumon
JantovenWarfarin
FalithromPhenprocoumon
Other VKAsVitamin K antagonists
What is INR and why do I need to track it?
INR (International Normalized Ratio) measures how long your blood takes to clot. If you take a vitamin K antagonist like Warfarin or Sintrom, your doctor sets a target range — typically 2.0 to 3.5, depending on your condition. Staying inside that range matters: too low and you risk a clot, too high and you risk bleeding. Tracking your INR over time helps you and your doctor adjust your dose with a clear record, not guesswork.
Which medications does INRythm support?
Every major vitamin K antagonist: Sintrom (acenocoumarol), Warfarin (Coumadin, Marevan, Jantoven), Marcoumar and Falithrom (phenprocoumon), and others. You set your medication name and target range once during setup.
Does INRythm replace my doctor or anticoagulation clinic?
No. INRythm is a personal tracking tool, not medical advice. Always follow your doctor's prescribed dose and your clinic's testing schedule. INRythm makes the record-keeping easier, so the conversations with your care team are clearer.
Where is my data stored? Is it private?
You sign in with email and password, and your dose log, INR readings, reminders, and settings are stored in Google Firebase on Google Cloud, encrypted in transit. Each account is fully private — we don't share your data with anyone, and we never sell it. You can delete your account from inside the app at any time, which wipes your synced data. The App Store privacy disclosure reflects this: any health data we collect is "Not Linked to You."
Does INRythm work without internet?
Yes. INRythm has a built-in cache mode: once you've signed in on a device, you can open the app, view your dose history, see your INR log, and log new doses with no internet connection. The next time you're online, everything syncs to your account automatically. You only need a connection for the initial sign-in and for syncing changes across multiple devices.
Can I export my data to share with my doctor?
Yes. From Settings → Data, export your dose and INR history as a CSV file you can email, print, or hand to your anticoagulation clinic.
Is there an Android version?
Yes. INRythm is available on both iOS and Android. Download from the App Store or get it on Google Play.
My parent isn't comfortable with phones. Will they manage?
That's what easy mode is for. It shows larger text and simplified screens with big buttons: today's dose, the latest INR, and one button to log. You can set the app up for them, switch on easy mode, and logging the day takes just a few seconds. Available in all seven languages.
How much does INRythm cost?
INRythm is completely free — no ads, no subscriptions, no in-app costs. It was built by a patient to help fellow patients, and it stays free for everyone who needs it.
What happens if I miss a dose?
Mark it as missed in the app. INRythm will show that day with a missed-dose marker so the gap is visible to you and your doctor. Always follow your doctor's guidance on what to do next; never double up unless they tell you to.
How do I change my target INR range?
Settings → Monitoring → Target range. Update it whenever your doctor adjusts your therapy. The change applies going forward — your historical data stays as it was.
How do I contact support?
Email inrythm@shtrak.bg. A real person reads every message.
Start tracking in 60 seconds.
Set up your medication, your target range, and your reminder time. Then close the settings and forget about them.