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Image: reddit.com · I quit Whoop but kept the Whoop MG, so I built my own Whoop

Unverified Proof shown

A private Whoop-style app for a Whoop MG

Claude Opus 5.5 built iOS and Android clones of the Whoop app from screenshots and recordings, with the poster's own backend.

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Credits

  • Reddit poster Impressive_Brush_859 Source ↗

Earliest dated source: 27 Oct 2026

The full story

The poster built it for themselves to keep data private and will not publish it. It was made from screenshots and recordings, sends data to their own web service and trains models there. They report about 5% deviation from the original and say respiratory rate, blood oxygen, resting heart rate and skin temperature work almost as well on their Whoop MG.

The work took around 60 hours with Claude Opus 5.5. The screen recording uses simulated data.

How it was done

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: I quit Whoop but kept the Whoop MG, so I built my own WhoopForum threadreddit.com
    Reddit poster: Impressive_Brush_859Posted 27 Oct 2026

    The maker's post on r/ClaudeCode.

    If it disappears: archived copy of Reddit: I quit Whoop but kept the Whoop MG, so I built my own Whoop (opens in a new tab)

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