A Polar Flow alternative for Loop and H10 owners

Journal · 2026-09-15 · R. Klug · All notes

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If you own a Polar Loop or an H10 chest strap and search for a Polar Flow alternative, you are usually after one thing: the data your sensors produce, in your own hands, without an account in between. That is exactly what ampulse is built for. It runs the Loop directly from your iPhone — setup, nightly sync and recording configuration over Bluetooth, no Polar Flow login — and stores everything the sensors send as files on the phone.

What ampulse does

• Runs the Loop directly. First-time setup, sync and recording settings, straight from the iPhone. Nights land on your phone; firmware updates come from Polar’s firmware service inside the app.
• Records the whole night. Heart rate and HRV across the night in five-minute windows, each gated on signal quality — and the pulse intervals behind every window stay on file, so you can open the actual measurement, not just its summary.
• Records training. Live heart rate and raw RR intervals from a chest strap such as the H10, with power from Concept2 PM5 or FTMS gym equipment in the same session file.
• Exports everything. FIT with raw RR, CSV, Kubios-compatible RR files, Strava upload when you connect it. The files are the primary storage — export is a copy, not a request.

What we stand for

ampulse is an instrument, not an oracle. It shows what was measured, marks the quality of each window, and leaves the judgment to you. Every displayed number can be traced to a file you can open, and those files remain readable — in Kubios, intervals.icu, a spreadsheet, your own scripts — whether or not you keep using the app. Your physiology, on record: the record belongs to you, at full resolution, for good.

One scope note

ampulse speaks to the Loop and to standard Bluetooth sensors. Polar watches sync with Flow — if your training lives on a Vantage or Pacer, Flow remains their home, and ampulse can still record your nights and strap sessions alongside.

Details on supported hardware are on the support page; how the direct Loop connection works is covered in Using the Polar Loop without Polar Flow.