Professional Audio Tools in Your Browser
The Swiss Army Knife of sound utilities. No downloads, no sign-up, no nonsense. Just powerful, free audio tools built with the Web Audio API.
Last reviewed on April 23, 2026
Choose Your Tool
Noise Generator
Generate white, pink, and brown noise for testing, relaxation, or sound masking
Guitar Tuner
Precise chromatic tuner with real-time pitch detection using your microphone
BPM Tapper
Tap to find the tempo of any song or set your DAW's BPM accurately
Frequency Generator
Generate pure tones from 20Hz to 20kHz with multiple waveform options
Metronome
Precision click track for practice sessions with visual timing indicators
Why Harmonoise?
🚀 Instant Access
No downloads, no installations, no registration. All tools run directly in your browser using the modern Web Audio API. Just click and use.
🔒 Privacy First
Everything runs locally in your browser. No data is sent to servers. Your audio never leaves your device. What happens in your browser stays in your browser.
âš¡ Performance
Optimized for speed with minimal external dependencies. Clean, efficient code designed for fast load times and low resource usage on modest hardware.
♿ Accessible
Built with accessibility in mind: full keyboard navigation, semantic markup for screen readers, thoughtful color contrast, and responsive design from phone to desktop.
🎨 Beautiful Design
Modern, clean interface with dark mode default and light mode option. Carefully crafted UI that's both professional and pleasant to use.
🆓 Always Free
No premium tiers, no paywalls, no sign-up. Professional-grade audio tools available to everyone. Built by audio enthusiasts for audio enthusiasts.
About Harmonoise
Harmonoise is a collection of professional audio utilities designed for musicians, producers, sound engineers, and audio enthusiasts. Built entirely with vanilla HTML, CSS, and JavaScript using the Web Audio API, these tools demonstrate what's possible with modern web technologies.
Whether you're tuning your guitar, finding the BPM of a track, generating test tones, or practicing with a metronome, Harmonoise provides the essential tools you need without the bloat of traditional desktop applications. Each tool is crafted with attention to detail, ensuring accurate results and smooth performance.
Our mission is simple: provide high-quality, accessible audio tools that anyone can use, anywhere, anytime. No barriers, no complications—just powerful tools when you need them.
Frequently Asked Questions
Do I need to create an account?
No! All tools are completely free and require no registration. Just visit the site and start using them immediately.
Does this work on mobile devices?
Yes! Harmonoise is fully responsive and works on all modern browsers including mobile devices. The guitar tuner requires microphone access, which is supported on most mobile browsers.
Is my audio data sent to a server?
No. Audio processing for every tool happens locally in your browser via the Web Audio API — nothing from your microphone or your generated tones is uploaded. The site itself does use Google Analytics and, after review, Google AdSense; details are in the Privacy Policy.
Which browsers are supported?
Harmonoise works on all modern browsers that support the Web Audio API, including Chrome, Firefox, Safari, and Edge. We recommend using the latest version for the best experience.
How accurate are these tools?
Very accurate! The guitar tuner uses advanced pitch detection algorithms, the metronome uses precise Web Audio API scheduling, and all frequency generators produce mathematically accurate waveforms.
Can I use these tools offline?
Currently, you need an internet connection to load the tools. Progressive Web App (PWA) support for offline usage is planned for a future update.