Observed Signal · May 5, 2026 · Technical Release · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Audio-to-Haptics: Sync Phone Vibration to Web Audio
A developer published audio-to-haptics, an open-source JavaScript library that analyzes audio or video playing in the browser and derives vibration patterns for navigator.vibrate so phone haptics play in sync with media. The library pre-processes audio into ~60ms buckets and uses a three-part algorithm — past-only neighbor comparison for onset detection, a sustain rule for decay tails, and PWM-based duty-cycle patterns to simulate intensity — plus a mute-window that compensates for audio pipeline latency using AudioContext.outputLatency + baseLatency. It is available on Github and npm, exposes both React hooks and a vanilla HapticEngine API, and works on Android Chrome, Samsung Internet and Opera Mobile. The post documents browser behaviors (decodeAudioData transfer semantics and pattern-array truncation) discovered during testing on a Samsung Galaxy M32.
Technical blog and open-source library that improves web UX and prototyping for haptics; useful for web games, landing pages and PWAs but not industry-shifting for AdTech/MarTech.
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Key Takeaways & Evidence Grounding
- audio-to-haptics is an open-source JS library available on Github and npm that generates vibration patterns from audio for navigator.vibrate.
- The algorithm uses precomputed ~60ms audio buckets with past-only neighbor comparison, sustain for decay tails, and PWM (pulse-width modulation) to simulate intensity.
- The library compensates for audio playback latency by suppressing vibrations for (AudioContext.outputLatency + AudioContext.baseLatency) milliseconds after play/seek/pause to keep haptics aligned with sound.
- Works on Android Chrome, Samsung Internet and Opera Mobile; desktop browsers generally do not implement the Vibration API.
- Platform findings documented: decodeAudioData transfers the ArrayBuffer (zeroing original buffer) and Chrome truncates vibration pattern arrays at roughly ~128 entries in practice.
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