HealthAPI
Your Apple Health, as an API.
Sync the health metrics you choose to a private account, get a personal API key, and let any AI answer questions about your body over a REST API you control.
iOS app previews, pending App Store approval.
The problem
Your richest health data (sleep, heart rate, workouts, vitals) is locked inside Apple Health, readable only inside individual apps. When you ask an AI assistant "how did I sleep last week?" it has no way to see any of it, and wiring HealthKit to an LLM yourself means building and hosting an entire backend.
The HealthAPI way
HealthAPI does that backend for you. You pick which metrics to sync; it stores them on your private account and exposes them through a single authenticated REST API, keyed to you. Point any assistant at the key and it can query your own data directly. Nothing leaves your account until you connect a tool.
How it works
- 1
Sync
Install the app and allow Health access for the categories you choose. Your metrics sync to your private account.
- 2
Get your key
Open the Connect AI screen to reveal your personal API key and a ready-made setup snippet.
- 3
Connect any tool
Paste the key into ChatGPT, Claude, a script, or any REST client.
- 4
Ask
The tool calls your API and answers from your real data, like "how did I sleep last week?"
What it does
Selective HealthKit sync
Reads 50 HealthKit metric types plus workouts: activity, cardiovascular and other vitals, sleep, nutrition, body composition. Only the categories you enable are read, and access is read-only, so HealthAPI never writes to Apple Health.
Personal REST API
Every account gets a secret key. Authenticate with a bearer token and call endpoints under /api/v1: raw samples, workouts, latest readings, daily and weekly summaries, and trend analytics. It’s plain REST, so any HTTP client works.
Aggregated, AI-friendly summaries
daily-summary returns totals, averages, sleep, and workout rollups as one JSON object, with flat top-level aliases (sleep_hours, workout_count, and more) so an assistant can read either the nested or the flat shape.
You stay the gatekeeper
The app never transmits your data to an AI on its own. Access requires your key, and regenerating it instantly revokes everyone. Your account is anonymous per device; Sign in with Apple is optional, only for recovery.
Own your data end-to-end
Full in-app export (a GDPR export endpoint) and deletion, with a 30-day recovery grace period or immediate erasure. Pick exactly what is shared: per-category sync means nothing you didn’t choose ever leaves the phone.
No built-in AI, by design
HealthAPI embeds no AI SDK and calls no AI service. It is the data layer an AI reads from; the intelligence comes from whatever assistant you connect with your key.
Pricing
Auto-renewable subscriptions, purchased inside the iPhone app via Apple in-app purchase. Both tiers include a 7-day free trial. There is no permanent free tier; an account stays locked (cloud sync and API gated) until you subscribe.
Pro
$4.99/mo
or $49.99/yr · 100 requests/day
- Personal REST API over your Apple Health
- 100 API requests per day
- Daily & weekly summaries + trends
- 7-day free trial
Developer
$9.99/mo
or $99.99/yr · 1,000 requests/day
- Everything in Pro
- 1,000 API requests per day
- Room to prototype real health agents
- 7-day free trial
The daily quota is a fixed UTC-day window. HealthAPI is not a medical device and makes no HIPAA or SOC 2 claims.
FAQ
Does HealthAPI send my health data to an AI?
No. The app stores your data and serves it through your personal API key. An AI can read it only if you give that tool your key. Revoke access anytime by regenerating the key.
How current and accurate is the data?
It’s your own Apple Health data, synced from your device: the same readings your other Health apps see. Summary endpoints aggregate those samples per day. HealthAPI is not a medical device and gives no medical advice.
What does it cost?
Pro is $4.99/mo or $49.99/yr (100 requests/day); Developer is $9.99/mo or $99.99/yr (1,000/day). Both include a 7-day free trial. There is no permanent free tier.
Which data sources are supported?
Apple Health (HealthKit) on iPhone: 50 metric types spanning activity, cardiovascular and other vitals, sleep, nutrition, body composition, and workouts.
How is my data secured?
Traffic is encrypted in transit (TLS); your API key is stored only as a bcrypt hash on the server and in the Keychain on your phone; and you can export or delete everything from the app.
Interested in HealthAPI?
Get HealthAPI on the links above, or reach the Overarch studio.