Rx Manager

Managing a real medication list means tracking quantities, refills, and lead times across a stack of bottles. The trick is reordering before you run out, with mail-order shipping factored in.

It needed to work on an older iPad, keep working with no internet, and reach the owner on their phone when something was due, without becoming one more app to check.

A single installable web app (PWA) that runs full-screen on the iPad, computes days-on-hand and order-by dates from its own supply math, and pushes a reminder to the owner’s phone the moment a medication crosses its reorder threshold.

• Offline-first: a service worker caches the whole app so it launches and runs with zero network.
• On-device OCR: point the camera at a prescription label and Tesseract.js reads it locally. Nothing leaves the device.
• Automated reminders: a daily job recomputes what’s due and texts a refill link, with proper opt-in and STOP/HELP compliance.
• Two-tap refills: supply, lead times, and renewals tracked per medication with a sortable, filterable list.

The interesting engineering wasn’t the UI. It was making it robust:

• Ancient Safari: tuned everything to a specific older WebKit build, down to font metrics and the exact WASM the OCR engine loads.
• Real telephony: a serverless reminder pipeline on Supabase Edge Functions + Twilio, including US A2P 10DLC registration and a hosted consent flow.
• Own-your-stack infra: custom domain, branded email, HTTPS, and a private data store, all wired up and documented.
• Trustworthy math: lead-time and run-out calculations verified against real-world pharmacy timing.

A private, dependable tool the owner leans on every week. It lives on the iPad, works offline, and sends a refill link the day one comes due.

It’s a good example of how we work: get the constraints right, handle the details most people skip, and ship something that keeps working.

Build something like this →