frets.in
Professional Toolkit

Free Guitar Tools for Every Player

Professional guitar tools. Free, fast, no install.

Live

Pro Tuner

High-precision chromatic tuner with YIN pitch detection and instrument presets.

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Live

Amp Simulator

Real-time tube simulation with 3-band EQ, cabinet modeling, and DSP effects.

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Beta

Fretboard

Interactive fretboard visualizer for guitar, bass, and ukulele with custom tunings.

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Live

Chord Library

Find any chord shape for any tuning. Interactive diagrams and voicing variants.

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Live

Scale Explorer

Visualize scale patterns across the neck. Major, minor, modes, and exotic raga scales.

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Live

Metronome

Precision timekeeping with rhythmic subdivisions and Indian Tala support.

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Live

Progression Builder

Build and hear chord sequences in any key. Includes a library of classic progressions.

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Live

Fretboard Trainer

Master the neck with interactive note identification and interval ear training.

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frets.in is a free, browser-based guitar toolkit built for guitarists who want professional-grade tools without downloading software. Every tool on frets.in runs entirely in your browser using the Web Audio API — your audio never leaves your device.

The pro chromatic tuner uses the YIN autocorrelation algorithm, the same method used in professional desktop tuners, giving you accurate pitch detection even on low strings like the open B on a 7-string or the low F# on a baritone guitar.

The amp simulator provides a real DSP signal chain — not a plugin wrapper — with presets tuned to famous tones from blues, rock, metal, and jazz. Plug in your guitar through any audio interface and play through your browser.

More tools are on the way: interactive fretboard, chord library, scale explorer, metronome, and a chord progression builder. All free, all browser-native.

Frequently Asked Questions

What is frets.in and how does it work?
frets.in is a professional-grade suite of musical tools designed for guitarists, bassists, and stringed instrument players that runs entirely within your web browser. It uses the modern Web Audio API to process your instrument signal in real-time without the need for any external software or cloud-based processing. When you play your guitar into your device's microphone or an audio interface, frets.in analyzes or processes that sound locally on your machine. This approach provides a high-performance experience with zero installation, making it the perfect digital companion for practice, tuning, and exploring music theory.
Are these guitar tools really free to use?
Yes, every tool on frets.in is completely free to use. Our goal is to provide the most accessible and high-quality toolkit for the global guitar community without any paywalls, subscriptions, or intrusive advertising. You can access the professional chromatic tuner, the tube amp simulator, and all of our music theory explorers without even creating an account. By keeping the project free and browser-based, we ensure that every player—from students to professionals—has access to the tools they need to master their instrument, regardless of their budget or device.
Do I need to install any software to use the tuner or amp sim?
No installation is required to use any of the tools on frets.in. Because the platform is built using native web technologies like the Web Audio API and React, it runs directly in modern browsers such as Chrome, Firefox, Safari, and Edge. This "zero-install" philosophy means you can tune your guitar or play through a virtual amp on any computer or mobile device simply by visiting the website. You never have to worry about compatibility issues, software updates, or clogging up your hard drive with large audio plugins.
Is an audio interface required for these tools?
While you can use frets.in with your device's built-in microphone for acoustic instruments or basic tuning, a dedicated USB audio interface is highly recommended for the best experience. Using an interface like a Focusrite Scarlett or Behringer U-Phoria allows you to plug your electric guitar or bass directly into your computer, providing a much cleaner signal for the amp simulator and significantly improved accuracy for the tuner. This setup also helps reduce latency, which is the slight delay between when you pick a string and when you hear the processed sound.
Does frets.in work on mobile devices and tablets?
Yes, frets.in is designed with a responsive, "mobile-first" approach and works excellently on smartphones and tablets. You can use the tuner or scale explorer on your iPhone, Android, or iPad just as easily as on a desktop computer. This makes it a great utility for quick tuning sessions or theory reference when you're away from your desk. For the best performance on mobile, we recommend using a modern browser like Safari or Chrome and ensuring that you grant the necessary microphone permissions when prompted by the app.
Is my microphone audio private when using the tuner?
Privacy is a core pillar of frets.in. All audio processing, including pitch detection for the tuner and signal chain simulation for the amp sim, happens entirely within your web browser on your own device. Your microphone audio is never recorded, stored, or transmitted to our servers or any third-party services. Once you close the tab, the audio context is destroyed and no record of your input remains. We believe that professional musical tools should be private by design, giving you the peace of mind to practice anywhere.
How accurate are browser-based guitar tools compared to apps?
Modern web browsers have become incredibly powerful, allowing frets.in to achieve accuracy that rivals many dedicated desktop and mobile applications. Our tuner, for example, uses the YIN autocorrelation algorithm, which is a industry-standard method for precise pitch detection in the time domain. By leveraging the Web Audio API's direct access to your hardware's audio buffer, we can provide real-time feedback that is professional enough for stage and studio use. As long as you have a stable internet connection to load the site, the performance is virtually indistinguishable from native software.
What instruments are supported besides 6-string guitar?
While many of our tools are optimized for guitar, frets.in is a comprehensive toolkit for many stringed instrument. The chromatic tuner can handle the low frequencies of a 5-string bass as well as the high register of a ukulele or violin. Our interactive fretboard and scale explorers allow you to switch between different instruments and tunings, including 4-string bass and ukulele presets. Whether you're playing a 7-string guitar in Drop A or a standard ukulele, our tools adapt to your specific instrument's layout and tuning requirements.
Can I use these tools offline?
Currently, frets.in requires an active internet connection to load the tools and assets into your browser. However, once the page has fully loaded, much of the processing for the tuner and amp simulator happens locally on your device. We are exploring "Progressive Web App" (PWA) features that would allow you to save frets.in to your home screen and use it even when you don't have a data connection. For now, we recommend loading the site while you have a connection and keeping the tab open if you expect to lose internet access during your practice session.
Why should I use browser-based tools instead of downloading a desktop app?
Browser-based tools like frets.in offer unparalleled convenience and cross-platform compatibility. You can switch between your laptop, phone, and tablet and always have access to the exact same tools and presets without syncing files or managing multiple installations. Additionally, web-based tools are inherently safer as they run in a "sandbox" environment, preventing them from accessing your private files. With the performance gap between browsers and native apps closing every day, frets.in provides a lightweight, high-performance alternative that is always just a URL away.

The Modern Standard for Guitarists

frets.in is designed to be the ultimate digital companion for guitarists and bassists. We combine professional-grade digital signal processing (DSP) with a deep understanding of music theory to bring you tools that work instantly in your browser.

Whether you're tuning up with our ultra-accurate chromatic tuner, jamming with the Titan V1 tube amp simulator, or exploring complex Indian Classical Ragas on our interactive fretboard, every tool is built for performance and clarity.

0ms
Latency
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Browser-Based
Zero
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PRO
Quality