An open protocol to collect, store and retrieve personal health data. Measurements, medication logs, meals, symptoms and wearable data today — built to extend toward medical records and beyond.
Early access Some pieces work, some don't. Building in the open — this site is catching up to where the protocol is now.
What it's for
Your health record should follow you, not get rebuilt from scratch every visit. These are the moments OHD is being designed for.
01
You walk in feeling sick. The clinician already sees the last few days of your temperature, what you've taken, your symptom log — because you granted them a scoped, time-bound view from your phone on the way in.
They add their findings. You approve them on your phone before they land in your record. No re-asking the same questions. No partial picture. When the visit is done, the grant expires.
02
An ambulance picks you up. A paramedic taps a tablet. With your phone in proximity — or via a pre-issued emergency grant — they see your allergies, blood type, current medications, recent vitals, advance directives.
Only what you flagged for emergencies. Only for the duration of the case. Every access is logged on both sides. Break-glass is auditable, scoped, time-bound — not a free-for-all.
03
Your assistant, your LLM, your phone's agent — through OHD it can actually read your data, with your permission, scoped to what you allow. "How was my sleep last week and why does my morning HR look off?" becomes a real answer, not a guess.
AI agents are first-class citizens of the protocol, not bolted on. You decide which agent gets which class of data, for how long, and you can pull a grant and watch the next call get denied.
See it in action
The Android app — what shipping today actually looks like. Mockups from the Pencil spec; the real APK renders to the same pixels.
OHD records over 20 types of health data — structured with vocabulary codes so every entry is queryable, portable and permanently yours.
Blood pressure, glucose, heart rate, lab results — any measurement with a vocabulary code.
Medications with dose and timing, food via barcode or free text, symptoms with severity, and custom forms you design yourself for anything else.
Sleep stages, steps, exercise sessions and all 18 Health Connect record types — synced automatically from your Android device in the background.
COLLECT
Android app, web connector, and manual logging. Syncs Health Connect data automatically.
STORE
Self-hosted REST API and Postgres event store. You own the server, the data, the encryption keys.
VIEW
AI health agent and preset dashboards. Ask questions in plain language or browse structured views. Doctors connect via time-limited read tokens.
Enter your OHD URL into the browser. We never see your credentials or your records.
Every read and write is logged to OHD Core. You can see exactly who accessed what and when.
All components are MIT-licensed. Run it yourself, fork it, audit it. No lock-in.
Your data never passes through our servers. You choose where it lives — and you can switch at any time without losing anything.
Managed by us. Syncs across all your devices. No setup — create an account and start logging.
Local SQLite only, no network required. Android and iOS only. Zero data leaves your phone.
Run OHD Core on your own server. Point the app at your URL — we never see or touch your data.
Your clinic, employer or insurer runs OHD. They give you a URL and a token — your data stays on their infrastructure, under their consent rules.
No accounts on our side. No implicit sharing. Access is explicit, audited and always revocable.
Share a scoped read token with your doctor, an app, or CORD. Set an expiry date — it stops working automatically.
Every API call is logged to a tamper-evident audit trail. You can see exactly who read what, and when.
Delete any token from your OHD instance — access is revoked immediately. No waiting, no support tickets.
Try it
The flagship logger. Manual entry, custom forms, dashboards, grants you can issue and revoke from your phone. This is the most complete piece today.
.apk in your Files app and confirm the install.Pre-release software. Expect bugs and breaking changes. Play Store distribution will follow once the protocol is stable.
Want to run your own storage, or build a client? Read how it works →
Where we're at
OHD had some initial work and is being filled in piece by piece. Here's the real state today, not a roadmap of promises.
storage.ohd.dev and
relay.ohd.dev. You can talk to them.
.deb, .rpm,
Arch PKGBUILD for bare-metal operators.
v0 while it stabilises; v1 when it does.