Polar Health Data (self-hosted)

Name: Polar Health Data (self-hosted)
Author: StuMason

by StuMasonversion 1.6.2i★ –iRuns on your computer

Registry nameio.github.StuMason/polar-flow-server

Install

Overview

Description from the maker (original English)

Self-hosted Polar health analytics with a built-in MCP server: sleep, HRV, workouts, baselines.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: Streamable HTTP
Category: Clinics & health
You need to fill in: DATABASE_URL, POLAR_CLIENT_ID, POLAR_CLIENT_SECRET

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: DATABASE_URL, POLAR_CLIENT_ID, POLAR_CLIENT_SECRET, BASE_URL

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

DockerDocker installed

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "polar-flow": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "DATABASE_URL",
        "-e",
        "POLAR_CLIENT_ID",
        "-e",
        "POLAR_CLIENT_SECRET",
        "-e",
        "BASE_URL",
        "docker.io/stumason/polar-flow-server:1.6.2"
      ],
      "env": {
        "DATABASE_URL": "your-value",
        "POLAR_CLIENT_ID": "your-value",
        "POLAR_CLIENT_SECRET": "your-value",
        "BASE_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add polar-flow --env DATABASE_URL=your-value --env POLAR_CLIENT_ID=your-value --env POLAR_CLIENT_SECRET=your-value --env BASE_URL=your-value -- docker run -i --rm -e DATABASE_URL -e POLAR_CLIENT_ID -e POLAR_CLIENT_SECRET -e BASE_URL docker.io/stumason/polar-flow-server:1.6.2

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "polar-flow": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "DATABASE_URL",
        "-e",
        "POLAR_CLIENT_ID",
        "-e",
        "POLAR_CLIENT_SECRET",
        "-e",
        "BASE_URL",
        "docker.io/stumason/polar-flow-server:1.6.2"
      ],
      "env": {
        "DATABASE_URL": "your-value",
        "POLAR_CLIENT_ID": "your-value",
        "POLAR_CLIENT_SECRET": "your-value",
        "BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "polar-flow": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "DATABASE_URL",
        "-e",
        "POLAR_CLIENT_ID",
        "-e",
        "POLAR_CLIENT_SECRET",
        "-e",
        "BASE_URL",
        "docker.io/stumason/polar-flow-server:1.6.2"
      ],
      "env": {
        "DATABASE_URL": "your-value",
        "POLAR_CLIENT_ID": "your-value",
        "POLAR_CLIENT_SECRET": "your-value",
        "BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

DATABASE_URL secret required env
PostgreSQL connection string, e.g. postgresql+asyncpg://user:pass@host:5432/polar
POLAR_CLIENT_ID required env
Polar AccessLink OAuth client id (register at admin.polaraccesslink.com)
POLAR_CLIENT_SECRET secret required env
Polar AccessLink OAuth client secret
BASE_URL env
Public HTTPS base URL of this deployment; enables OAuth sign-in for MCP connectors

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account StuMason, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Clinics & healthi

More stars than 0% of the other 1022 servers in this category
Published to the registry more recently than 59% of the other 1022 servers in this category
Basic checks equal to or better than 100% of the other 1022 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Polar Health Data (self-hosted) safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: DATABASE_URL, POLAR_CLIENT_ID, POLAR_CLIENT_SECRET

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.6.2) reached the registry 19 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Docker on your computer.

What can I use instead?

In the same category: Mirobody, FHIR MCP Server, Google Health MCP

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Mirobody

by thetahealth

Lab results to LOINC codes and UCUM units, symptoms and diagnoses to ICPC-3. Offline, no API key.

Runs on your computer★ 1,408Apache-2.0Updated today

Install

FHIR MCP Server

by wso2

MCP server providing seamless access to FHIR APIs for AI tools and healthcare applications

Runs on your computer★ 137Apache-2.0Updated 9 days ago

Install

Google Health MCP

by davidmosiah

Privacy-first unofficial Google Health API v4 MCP server for health, sleep, activity, HR agents

Runs on your computer★ 79MITUpdated 4 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

polar-flow-server

Self-hosted health analytics for Polar devices — own your data, analyze it against your own baselines, and let your AI assistant read it.

[Full Documentation](https://stumason.github.io/polar-flow-server/) · MCP Server · Integration Guide · API Reference

What This Does

Your watch knows more about you than you do — and Polar's API only lets you see the last 28-30 days of it. This server syncs everything, keeps it forever, and turns it into answers:

Syncs all 13 Polar API endpoints automatically — sleep, HRV, activity, workouts, SpO2, ECG, skin temperature, the lot
Stores everything in PostgreSQL. Your data, your server, no cloud between you and it
Computes personal baselines (rolling averages, IQR anomaly bounds) so "is this normal?" means normal *for you*
Ships a built-in MCP server with OAuth sign-in — ask Claude "should I train hard today?" and it answers from your overnight HRV vs your baseline
Admin dashboard (HTMX), REST API, per-user API keys, multi-user ready

Ask Your AI About Your Body (MCP)

A built-in Model Context Protocol server — protocol revision 2026-07-28, streamable HTTP — runs inside the main server at /mcp. Ten curated tools cover the one-shot health assessment, sleep, recovery, activity, workouts, seven biosensing streams, personal baselines, patterns/anomalies, and sync control.

In clients that render MCP Apps (claude.ai, Claude Desktop, VS Code), asking "how am I doing?" draws an actual card in the conversation:

Connecting is a sign-in, not a paste. With BASE_URL set, the server is its own OAuth 2.1 authorization server: add https://your-server/mcp as a custom connector in Claude Desktop or claude.ai, click Connect, log in on *your* server, approve the consent screen. Tokens are user-scoped, expire hourly, refresh automatically, and every connected app is revocable from Settings. API keys still work for headless clients:

claude mcp add polar-health https://your-server.example.com/mcp \

--transport http \ --header "X-API-Key: pfk_your_key_here"

Full setup in the MCP docs.

Architecture

Polar API → polar-flow SDK → Sync Service → PostgreSQL

↓ Admin Dashboard (HTMX) ↓ REST API

Stack:

Litestar (async web framework)
SQLAlchemy 2.0 (async ORM)
PostgreSQL
HTMX + Tailwind (admin UI)
polar-flow SDK v1.5.0

Don't fancy running a server? A hosted version is in the works — join the waitlist. Self-hosting stays free forever.

Quick Start

Option 1: Docker (Recommended)

# Pull and run

curl -O https://raw.githubusercontent.com/StuMason/polar-flow-server/main/docker-compose.prod.yml docker-compose -f docker-compose.prod.yml up -d

That's it. Open http://localhost:8000/admin

Option 2: From Source

git clone https://github.com/StuMason/polar-flow-server.git

cd polar-flow-server docker-compose up -d

Setup

Open http://localhost:8000/admin
Get Polar credentials from admin.polaraccesslink.com (set redirect URI to http://localhost:8000/admin/oauth/callback)
Enter credentials and click "Connect with Polar"
Hit "Sync Now" to pull your data

The server syncs data every hour automatically.

Dashboard

The admin panel at /admin/dashboard is organised into tabs (with a floating tab bar on mobile):

Overview - stat tiles (HRV, resting HR, SpO2, skin temp, steps, strain, sleep score, alertness...), Today's Readiness recommendations, and "Today at a Glance" mini-charts (sleep stages, heart rate, steps)
Trends & Baselines - personal baselines and detected patterns
Sleep - sleep score and stage-duration charts
Heart Rate - daily HR, HRV and ANS charge charts, biosensing panel
Training Load - activity and cardio load charts

Charts have a selectable 7/14/30-day range and CSV export. API keys are managed from the settings page, with rate limit tracking. All frontend assets are vendored - the dashboard works offline and on a LAN with no CDNs.

Data Synced (13 Endpoints)

Endpoint	Data
Sleep	Score, stages (light/deep/REM), duration
Nightly Recharge	HRV, ANS charge, recovery status
Daily Activity	Steps, distance, calories, active time
Exercises	Sport, duration, HR zones, training load
Cardio Load	Strain, tolerance, load ratio, status
SleepWise Alertness	Hourly alertness predictions
SleepWise Bedtime	Optimal sleep timing recommendations
Activity Samples	Minute-by-minute step data
Continuous HR	All-day heart rate (5-min intervals)
SpO2	Blood oxygen tests (compatible devices)
ECG	Electrocardiogram tests (compatible devices)
Body Temperature	Continuous body temperature
Skin Temperature	Nightly skin temperature with baseline deviation

Configuration

Required Environment Variables

Variable	Description	Required
`DATABASE_URL`	PostgreSQL connection string	Yes
`ENCRYPTION_KEY`	32-byte Fernet key for token encryption	Yes (production)

Generate an encryption key:

python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"

Optional Environment Variables

Variable	Description	Default
`DEPLOYMENT_MODE`	`self_hosted` or `saas`	`self_hosted`
`SYNC_INTERVAL_HOURS`	Auto-sync frequency	`1`
`SYNC_ON_STARTUP`	Sync when server starts	`false`
`SYNC_DAYS_LOOKBACK`	Days of history to sync	`28`
`LOG_LEVEL`	Logging verbosity	`INFO`
`API_KEY`	Master API key (bypasses rate limits)	None

API Authentication

API endpoints require authentication. Health data should never be publicly accessible.

Authentication Methods

Per-User API Keys (recommended) - Create from the admin dashboard or via OAuth flow
Master API Key - Set API_KEY env var for full access (bypasses rate limits)

Using API Keys

# With per-user API key (includes rate limit headers)

curl -H "X-API-Key: pfk_your_api_key_here" \ http://localhost:8000/api/v1/users/{user_id}/sleep?days=7

Response headers include:

X-RateLimit-Limit: 1000

X-RateLimit-Remaining: 999

X-RateLimit-Reset: 1704067200

Rate Limiting

Default: 1000 requests per hour per API key
Rate limits reset hourly
Master API key (API_KEY env var) bypasses rate limiting
Rate limit info returned in response headers

OAuth Integration (SaaS / Multi-User)

For applications that need to integrate with polar-flow-server (e.g., Laravel, mobile apps, web frontends).

This allows any Polar user to connect their account to your application.

OAuth Flow

┌─────────────────┐     ┌─────────────────────┐     ┌─────────────────┐

│ Your App │────▶│ polar-flow-server │────▶│ Polar Flow │ │ (Laravel etc) │ │ │ │ (OAuth) │ │ │◀────│ │◀────│ │ └─────────────────┘ └─────────────────────┘ └─────────────────┘

Step 1: Redirect user to start OAuth

GET /oauth/start?callback_url=https://yourapp.com/callback&client_id=your-app-name

Parameter	Required	Description
`callback_url`	Yes	Where to redirect after OAuth (your app's callback endpoint)
`client_id`	No	Identifier for your app (validated during exchange)

Step 2: User authorizes on Polar

User is redirected to Polar, logs in with their credentials, and authorizes your app.

Step 3: User redirected to your callback

https://yourapp.com/callback?code=TEMP_CODE_HERE

Step 4: Exchange temp code for API key (server-to-server)

POST /oauth/exchange

Content-Type: application/json

{ "code": "TEMP_CODE_HERE", "client_id": "your-app-name" }

Response:

"api_key": "pfk_abc123...", "polar_user_id": "12345678", "expires_at": null }

Step 5: Store and use the API key

Store api_key and polar_user_id for this user. Use the API key for all data requests:

curl -H "X-API-Key: pfk_abc123..." \

"https://your-polar-server.com/api/v1/users/12345678/sleep?days=7"

Polar Admin Setup

In admin.polaraccesslink.com, set your app's redirect URI to:

https://your-polar-server.com/oauth/callback

Key Management

# Get key info

GET /api/v1/users/{user_id}/api-key/info X-API-Key: pfk_...

Regenerate key (invalidates old key)

POST /api/v1/users/{user_id}/api-key/regenerate X-API-Key: pfk_...

Revoke key

POST /api/v1/users/{user_id}/api-key/revoke X-API-Key: pfk_...

API Endpoints

# Health check (no auth required)

curl http://localhost:8000/health

Get sleep data (last 7 days)

curl -H "X-API-Key: pfk_..." \ "http://localhost:8000/api/v1/users/{user_id}/sleep?days=7"

Get activity data

curl -H "X-API-Key: pfk_..." \ "http://localhost:8000/api/v1/users/{user_id}/activity?days=7"

Get nightly recharge (HRV)

curl -H "X-API-Key: pfk_..." \ "http://localhost:8000/api/v1/users/{user_id}/recharge?days=7"

Get exercises

curl -H "X-API-Key: pfk_..." \ "http://localhost:8000/api/v1/users/{user_id}/exercises?days=30"

Export summary

curl -H "X-API-Key: pfk_..." \ "http://localhost:8000/api/v1/users/{user_id}/export/summary?days=30"

Development

# Install dependencies

uv sync --all-extras

Start PostgreSQL

docker-compose up -d postgres

Run server with hot reload

uv run uvicorn polar_flow_server.app:app --reload

Run tests

uv run pytest

Type check

uv run mypy src/polar_flow_server

Lint

uv run ruff check src/

Production Deployment

Deploy anywhere that runs Docker:

# Download and run

curl -O https://raw.githubusercontent.com/StuMason/polar-flow-server/main/docker-compose.prod.yml docker-compose -f docker-compose.prod.yml up -d

Coolify, Railway, Render, etc. - Point at the GitHub repo, it builds from the Dockerfile.

Required for production:

Set ENCRYPTION_KEY environment variable (tokens won't persist across restarts otherwise)
Set DATABASE_URL to your PostgreSQL instance

Database migrations run automatically on startup.

Multi-Tenancy

The server supports multiple users out of the box:

Every table includes user_id column
All queries scoped by user_id
Per-user API keys ensure users can only access their own data
Self-hosted: typ

Only the beginning is shown; read the rest in the repo

Polar Health Data (self-hosted)

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Clinics & healthi

Common questions

Alternatives

Mirobody

FHIR MCP Server

Google Health MCP

README from the maker

polar-flow-server

What This Does

Ask Your AI About Your Body (MCP)

Architecture

Quick Start

Option 1: Docker (Recommended)

That's it. Open http://localhost:8000/admin

Option 2: From Source

Setup

Dashboard

Data Synced (13 Endpoints)

Configuration

Required Environment Variables

Optional Environment Variables

API Authentication

Authentication Methods

Using API Keys

Response headers include:

X-RateLimit-Limit: 1000

X-RateLimit-Remaining: 999

X-RateLimit-Reset: 1704067200

Rate Limiting

OAuth Integration (SaaS / Multi-User)

OAuth Flow

Polar Admin Setup

Key Management

Regenerate key (invalidates old key)

Revoke key

API Endpoints

Get sleep data (last 7 days)

Get activity data

Get nightly recharge (HRV)

Get exercises

Export summary

Development

Start PostgreSQL

Run server with hot reload

Run tests

Type check

Lint

Production Deployment

Multi-Tenancy