offline.observer
Free sounds, pure math. No samples, no recordings.
Built with Web Audio API. Listen, learn, download.
// categories
// sound types
// featured sounds
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Crackling Campfire
Updated:Free campfire sound effect generated entirely with Web Audio API. Listen to a realistic synthesized crackling fire with deep roar and hissing gas, and download it as a WAV file for free.
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Ocean Waves
Updated:Free ocean wave sound effect generated entirely with Web Audio API. Listen to realistic synthesized sea waves with crashing foam and deep undertow, and download it as a WAV file for free.
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Rain Ambience
Updated:Free rain sound effect generated entirely with Web Audio API. Listen to a realistic synthesized rain ambiance, learn how it's made with code, and download it as a WAV file for free.
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Babbling Brook
Updated:Free babbling brook sound effect generated entirely with Web Audio API. Listen to a realistic synthesized stream ambiance, learn how it's made with code, and download it as a WAV file for free.
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Thunder
Updated:Free thunder sound effect generated entirely with Web Audio API. Listen to a realistic synthesized thunderclap with rolling rumble, and download it as a WAV file for free.
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Wind Ambience
Updated:Free wind sound effect generated entirely with Web Audio API. Listen to a realistic synthesized wind ambiance with layered noise and LFO modulation, and download it as a WAV file for free.
// recent sounds
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UI Click
Updated:Free UI click sound effect generated entirely with Tone.js and Web Audio API. Listen to a crisp synthesized click, learn how transient sounds work, and download it as a WAV file for free.
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808 Kick
Updated:Free 808 kick drum sound effect generated entirely with Web Audio API. Listen to a deep synthesized kick drum, learn how it's made with Tone.js, and download it as a WAV file for free.
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Error Buzzer
Updated:Free error buzzer sound effect generated entirely with Tone.js and Web Audio API. Listen to a synthesized descending warning tone, learn why it signals danger, and download it as a WAV file for free.
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Explosion
Updated:Free explosion sound effect generated entirely with Web Audio API. Listen to a powerful synthesized blast sound, learn how it's made with Tone.js, and download it as a WAV file for free.
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8-Bit Jump
Updated:Free jump sound effect generated entirely with Web Audio API. Listen to a classic 8-bit style synthesized jump sound, learn how it's made with Tone.js, and download it as a WAV file for free.
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Coin Pickup
Updated:Free coin collect sound effect generated entirely with Web Audio API. Listen to a bright synthesized coin pickup sound, learn how it's made with Tone.js, and download it as a WAV file for free.
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Brown Noise
Updated:Free brown noise sound effect generated entirely with Tone.js and Web Audio API. Listen to deep synthesized brown noise, learn about Brownian motion audio, and download it as a WAV file for free.
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Notification Chime
Updated:Free notification chime sound effect generated entirely with Tone.js and Web Audio API. Listen to a pleasant ascending triad, learn the music theory behind alert sounds, and download it as a WAV file for free.
All sounds are generated with Web Audio API — no samples, just code.