How to connect Polar to Claude Desktop

This guide walks through connecting Polar to Freddy, then adding Freddy as a connector in Claude Desktop. Total time: about five minutes if you already have a Polar account.

What you will need

Polar specifics worth knowing. Polar's AccessLink API is the official path Freddy uses; it returns sleep, training sessions, daily activity, Nightly Recharge, Cardio Load, and SleepWise data depending on which Polar device you have. The Vantage V3 and Pacer Pro expose the full set; entry-level trackers (Ignite, Unite) expose sleep and training but not Nightly Recharge. Freddy reads whatever your account exposes; if a metric is missing in Claude, it is usually because your specific Polar device does not record it.

If you wear a Polar Verity Sense or H10 chest strap and use Polar Flow's manual entry, those workouts also show up in the API and Freddy will pull them.

Step 1: Sign up for Freddy

Go to freddy.coach and enter your email. You will get a magic link in your inbox; click it to log in. No password to remember.

Step 2: Connect your Polar account

On the Freddy dashboard, find Polar in the "Add a connection" list and click Connect. Freddy will redirect you to Polar to authorize access. Polar keeps you logged in there; Freddy never sees your Polar password.

After authorizing, Freddy starts pulling your data. The first sync covers up to the last 30 days on the free tier (unlimited on Pro). You can leave the page; the sync runs in the background and the dashboard shows progress.

Step 3: Copy your MCP URL

On your dashboard, look for the "Your MCP URL" card. Copy the URL. It is unique to your account and includes a token that lets Claude read your data; keep it private.

Step 4: Add Freddy to Claude Desktop

Open Claude Desktop and go to Settings > Connectors > Add Connector. Paste your Freddy URL into the URL field and click Add. Claude verifies the connection and Freddy appears in your connector list.

Step 5: Try a query

Open a new Claude conversation and ask:

What's my recent Polar data look like?

Claude will use Freddy to read your latest sleep, recovery, or workout data and summarize it. Try follow-ups like "compare this week to last week" or "what trends do you see in my HRV." Claude can reason across whatever Polar exposes through its API; the more days of data Freddy has synced, the more useful these conversations become.

Troubleshooting

Claude says it can't reach Freddy. Check that you copied the full URL and that Claude Desktop is up to date. If the URL token has been rotated (you can rotate it in Freddy's dashboard if you suspect it leaked), the old URL stops working. Paste the new one into Claude.

No data showing up. First-time sync can take a few minutes for accounts with a lot of history. Check the Freddy dashboard for sync progress; if it shows "running" for more than 15 minutes, refresh and check the connection status.

A specific metric is missing. Not every Polar account exposes every metric (some require a particular subscription tier or device). Check the provider page on the Freddy dashboard for which metrics are available for your account.

Updated 2026-05-08. Polar and Claude Desktop both update their interfaces from time to time; let us know if a step looks wrong.