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BPM Lock

Fix tempo drift. Lock every beat to one steady BPM.

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Fixes BPM drift in songs whose tempo wanders. Detects every beat and time-stretches each one onto a constant integer-BPM grid, so old records, live recordings and hand-played music play at one steady tempo from start to finish. Runs entirely in the browser.

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PH · launched Oct 20, 2026 · 1 upvote (top 67%)

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Could you build this?

Partial The UI and time-stretch pipeline are buildable in the browser with Web Audio, but accurate per-beat detection and artifact-free stretching of real recordings is a hard DSP problem.

What it would actually take: The stack is a Web Audio frontend with a beat-tracking library (or a port such as Essentia.js or madmom-like models) and a time-stretching engine with warping per beat segment. The hard part is detecting beats reliably in messy live or old recordings and avoiding audible artifacts when warping. That requires DSP expertise and extensive listening-based tuning.

Competitors

Other products that read as similar to this one : 121 launches clear the similarity bar, closest 8 shown.

Attention rank: #50 of 122 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 356 days after the earliest competitor.

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