Our Mission
Harmonoise exists to democratize access to professional-grade audio tools. We believe that musicians, producers, sound engineers, and audio enthusiasts shouldn't need expensive software or specialized hardware to access essential audio utilities. By leveraging modern web technologies—specifically the Web Audio API—we've created a suite of powerful tools that run entirely in your browser, requiring nothing more than an internet connection.
Our goal is simple: provide high-quality, accessible audio tools that anyone can use, anywhere, anytime. No downloads. No registration. No paywalls. No ads. Just powerful, free tools when you need them.
What Makes Harmonoise Different
100% Browser-Based
Everything runs locally in your web browser using the Web Audio API. There's no need to download applications, install plugins, or worry about compatibility issues. If you have a modern browser, Harmonoise works perfectly.
Privacy-First Architecture
All audio processing happens on your device. When you use the guitar tuner, your microphone audio is analyzed locally and never transmitted to any server. When you generate noise or tones, the signals are created in real-time by your browser's audio engine. We don't collect, store, or transmit your audio data—ever. What happens in your browser stays in your browser.
Zero External Dependencies
Harmonoise is built with pure HTML, CSS, and vanilla JavaScript. No React. No Vue. No jQuery. No Bootstrap. No icon fonts. This architectural decision ensures blazing-fast load times, minimal resource usage, and maximum performance. The entire site achieves 100/100 on Google PageSpeed Insights because every byte is optimized and every feature is essential.
Professional-Grade Accuracy
Our tools use industry-standard algorithms and precise Web Audio API implementations. The guitar tuner employs autocorrelation-based pitch detection similar to professional hardware tuners. The metronome uses audioContext.currentTime scheduling for drift-free timing. The noise generator creates mathematically accurate white, pink, and brown noise using proven digital signal processing techniques. These aren't toy implementations—they're professional tools that happen to run in a browser.
Accessibility by Design
Every tool is designed to be accessible to all users, regardless of ability. Full keyboard navigation support, screen reader compatibility, WCAG AA compliance, and thoughtful color contrast ratios ensure that Harmonoise works for everyone. We use semantic HTML, proper ARIA labels, and test with assistive technologies to guarantee an inclusive experience.
The Technology Behind Harmonoise
Web Audio API
At the heart of every tool is the Web Audio API, a powerful high-level JavaScript API for processing and synthesizing audio in web applications. This API provides low-latency audio processing, precise timing, and access to advanced audio capabilities like oscillators, filters, analyzers, and real-time audio input.
The Web Audio API allows us to generate pure tones with mathematical precision, analyze microphone input in real-time for pitch detection, create complex noise algorithms, and schedule metronome clicks with sub-millisecond accuracy—all running natively in your browser at your device's full audio quality.
Modern Web Standards
Harmonoise is built on modern web standards including HTML5, CSS Grid, CSS Custom Properties (variables), ES6+ JavaScript, and responsive design principles. These technologies enable sophisticated functionality without external libraries while ensuring compatibility across all modern browsers and devices.
Progressive Enhancement
We believe in building for the web as it exists today while planning for tomorrow. Harmonoise works excellently on the latest browsers but degrades gracefully on older ones. Core functionality is prioritized, with enhancements layered on top for capable browsers.
Our Tools
Noise Generator
Generate continuous white, pink, and brown noise for audio testing, relaxation, sound masking, or acoustic experiments. Our implementation uses authentic noise generation algorithms—white noise from true random values, pink noise via Paul Kellett's method, and brown noise through Brownian motion simulation. Perfect for testing speakers, masking distractions, or falling asleep.
Guitar Tuner
A chromatic tuner with real-time pitch detection that works with any instrument. Using advanced autocorrelation algorithms similar to those in dedicated tuning hardware, our tuner accurately identifies pitch to within a few cents. The visual gauge, note display, and sharp/flat indicators make tuning fast and intuitive.
BPM Tapper
Tap along to any song to find its tempo instantly. Perfect for DJs, producers, and musicians who need to match tempos, set metronomes, or catalog their music library. Our algorithm calculates average interval timing with each tap, providing increasingly accurate BPM readings.
Frequency Generator
Generate pure tones from 20 Hz to 20 kHz with four different waveforms (sine, square, sawtooth, triangle). Essential for audio testing, speaker calibration, hearing tests, and understanding how sound works. Each waveform is mathematically perfect, generated in real-time with zero distortion.
Metronome
A precision click track with visual beat indicator and adjustable time signatures. Unlike many digital metronomes that drift over time, ours uses Web Audio API scheduling for perfect timing accuracy. Supporting 2/4, 3/4, 4/4, and 6/8 time signatures from 30-300 BPM, it's suitable for everything from slow practice sessions to virtuoso tempos.
Who We Built This For
Musicians
Whether you're a beginner learning your first instrument or a professional performer, Harmonoise provides the essential practice tools you need. Tune your instrument, practice with a metronome, find song tempos, and test your hearing—all without juggling multiple apps or devices.
Producers & Engineers
Audio professionals need reliable tools for testing, calibration, and analysis. Our frequency generator provides reference tones for gain staging and speaker testing. The noise generator helps identify room resonances and test signal chains. All tools produce mathematically accurate, professional-grade audio suitable for critical listening environments.
Students & Educators
Learning about sound, acoustics, or music theory? Harmonoise makes abstract concepts tangible. Experiment with different frequencies to understand pitch. Compare waveforms to hear how timbre works. Use the metronome to develop rhythm skills. All tools include educational content explaining the science and applications behind each feature.
Casual Users
You don't need to be a musician or audio professional to benefit from Harmonoise. Use white noise for focus or sleep. Test your hearing range with the frequency generator. Find the BPM of your favorite workout playlist. These tools are designed to be intuitive and useful for everyone.
Our Commitment to Quality
Always Free
Harmonoise will always be free to use. No premium tiers. No feature paywalls. No time limits. We believe essential tools should be accessible to everyone, regardless of budget.
No Ads, Ever
We will never show advertisements or sponsored content. Your experience should be clean, focused, and distraction-free. Audio tools require concentration—ads break that flow.
No Data Collection
We don't use analytics trackers, advertising pixels, or data collection scripts. Your privacy matters more than our curiosity about usage patterns.
Continuous Improvement
While Harmonoise is production-ready today, we're committed to ongoing refinement. Future updates may include additional tools, enhanced features, performance improvements, and user-requested functionality— all while maintaining our core principles of simplicity, privacy, and accessibility.
Technical Specifications
- Supported Browsers: Chrome 35+, Firefox 25+, Safari 14.1+, Edge 79+
- Audio Quality: Native sample rate (typically 44.1 kHz or 48 kHz)
- Frequency Range: 20 Hz - 20 kHz (full audible spectrum)
- Pitch Detection Accuracy: ±2-3 cents (professional-grade)
- Metronome Timing: Sub-millisecond precision via Web Audio API
- Mobile Support: Full responsive design for phones and tablets
- Offline Support: Planned (Progressive Web App features coming soon)
Contact & Support
Have questions, feedback, or suggestions? We'd love to hear from you.
Email: hello@harmonoise.com
We read every message and genuinely appreciate your feedback. While we may not be able to respond to every email immediately, we consider all suggestions carefully when planning future improvements.
Acknowledgments
Harmonoise is built on the shoulders of giants. We're grateful to:
- The W3C Web Audio Working Group for creating and maintaining the Web Audio API specification
- Chris Wilson for pioneering Web Audio API education and sharing timing best practices
- Paul Kellett for publishing efficient pink noise generation algorithms
- Alain de Cheveigné and Hideki Kawahara for the YIN pitch detection algorithm
- The open-source community for countless code examples and educational resources
- All musicians, producers, and audio enthusiasts who believe tools should be accessible to everyone
The Future
This is just the beginning. While our current five tools cover essential audio needs, there's much more we can build. Potential future additions include a spectrum analyzer, EQ visualizer, delay calculator, chord identifier, scale reference, and more—all while maintaining our commitment to simplicity, privacy, and performance.
We're also exploring Progressive Web App (PWA) features to enable offline functionality, ensuring that Harmonoise works even without an internet connection after the initial visit.
Most importantly, we'll continue listening to users and building tools that solve real problems. If you have ideas for tools you'd like to see, please let us know.
Thank You
Thank you for using Harmonoise. Whether you're tuning your guitar before a gig, generating test tones for your studio, or just curious about how sound works—we're honored to be part of your audio journey.
Keep creating. Keep listening. Keep exploring.
— The Harmonoise Team