Building ClotWatch: An INR tracking app for the 50+ million people on blood thinners worldwide
Hey Product Hunt community,
I'm launching ClotWatch on January 1st and wanted to share the story behind it.
The Problem
If you or someone you love takes anticoagulants (blood thinners like Warfarin, Eliquis, or Xarelto), you know the drill: regular INR blood tests, careful diet management, and the constant mental math of "am I in range?"
Most people track this in notebooks, random apps, or not at all. When it's time for a doctor's appointment, they scramble to remember their history. And calculating Time in Therapeutic Range (TTR) - the gold standard metric clinicians actually care about - requires a spreadsheet or guesswork.
What I Built
ClotWatch (https://clot.watch) is a mobile-first, fully responsive INR tracking app that does three things well:
Simple logging - Record INR readings with context tags (diet changes, illness, travel, medication adjustments)
Automatic TTR calculation - See your Time in Therapeutic Range without manual math
Clean reports - Generate shareable summaries for healthcare appointments
Exports - Export your readings for any given period and either download as a CSV file or email them directly to your healthcare team.
Log readings from your phone right after a test, review your history on a tablet, or generate reports on desktop before an appointment - it works seamlessly across all devices.
No bloat. No social features. No gamification. Just a tool that helps people stay safe.
Why I'm Sharing This Now
I'm bootstrapping this solo and launching January 1st. Before then, I'd genuinely love feedback from this community:
- Anyone here on anticoagulants or caring for someone who is?
- What would make an INR tracker actually useful for you?
- Any thoughts on the landing page (https://clot.watch)?
The pricing is $2.99/month or $29.99/year with a 30-day free trial - trying to keep it accessible since this isn't a "nice to have" for the people who need it.
Thanks for reading. Happy to answer any questions about the build, the problem space, or the launch strategy.
Replies