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GuitarTuner.io
What it is
GuitarTuner.io is a browser-based tuner for acoustic guitar, electric guitar, and bass. It listens through a microphone and detects pitch in real time, indicating whether a note is sharp, flat, or in tune. The site lists 69 free tuners for standard, drop, open, modal, bass, ukulele, mandolin, banjo, and extended-range tunings; users can also make custom tunings with any number of strings and notes. Its microphone audio is processed in the browser. The tuner runs as an installable Progressive Web App and can work offline after installation and caching. A modern browser and microphone are required; listed supported devices include iPhone, Android, Windows, Mac, and Chromebook. Additional practice tools include an interactive chord library with diagrams and audio playback, plus a metronome with adjustable tempo, time signatures, and visual feedback. The browser tuner is free to use without an account, paid upgrade, or app download. A proposed native iPhone and Android Pro app remains a demand test and is not available to buy.
For and against
For
- 69 listed tuners cover multiple instruments and tuning styles.
- Custom tunings allow any number of strings and notes.
- Pitch feedback identifies sharp, flat, or in-tune notes.
- Chord library includes diagrams and audio playback.
- Installed app can work offline after caching.
Against
- A modern browser and microphone are required.
- Native iPhone and Android Pro app is not available to buy.
The verdict
GuitarTuner.io combines free browser tuning with custom tunings and practice tools. The offline option depends on installing and caching the web app, while the proposed native app is not yet for sale.
Who it suits
It suits musicians who want browser-based tuning across several instruments and tuning styles, with chord and metronome tools for practice. It can also suit players who want offline access after installing the web app.
Plans and prices
Free web tuner
browser tuner · no account · no paid upgrade · microphone required
Read 15 Oct 2026 · guitartuner.io
GuitarTuner Pro (proposed)
native iPhone and Android app concept · demand test only · not available to buy
Read 15 Oct 2026 · guitartuner.io
On the record
- Account requirement
- The browser tuner is presented as usable without an account or paid upgrade.guitartuner.io · read 15 Oct 2026
- Affiliate disclosure
- The tuning directory discloses commission-based links to Guitar Tricks and says the commission does not increase the user's cost.guitartuner.io · read 15 Oct 2026
- Analytics and hosting
- Google Analytics and Netlify are identified as third-party services used for usage analysis, hosting and content delivery.guitartuner.io · read 15 Oct 2026
- Audio processing
- The site says microphone audio is processed in the browser to provide tuning feedback.guitartuner.io · read 30 Sep 2026
- Chord categories
- The chord library includes major, minor, seventh, suspended, power and barre chord groups.guitartuner.io · read 15 Oct 2026
- Chord library
- The chord library provides interactive diagrams, multiple chord variations and audio playback.guitartuner.io · read 15 Oct 2026
- Company details
- The opened maker pages identify the creator but do not state a headquarters or founding year.guitartuner.io · read 30 Sep 2026
- Cookies
- Cookies are used for visitor tracking and preferences such as favorite tunings and custom settings.guitartuner.io · read 15 Oct 2026
- Creator
- Official pages identify John Sorrentino as the creator.guitartuner.io · read 15 Oct 2026
- Creator employer
- The GitHub profile lists XSELL Technologies.github.com · read 15 Oct 2026
- Creator GitHub activity
- The profile shows 136 stars, 92 followers and 24 accounts followed.github.com · read 15 Oct 2026
- Creator location
- John Sorrentino's public GitHub profile lists Chicago, Illinois.github.com · read 15 Oct 2026
- Creator repositories
- The GitHub profile shows eight repositories.github.com · read 15 Oct 2026
- Custom tunings
- Users can create custom setups with any number of strings and notes.guitartuner.io · read 15 Oct 2026
- Favorites
- Favorite tunings can be starred for quick access and are stored as local preferences.guitartuner.io · read 15 Oct 2026
- Installable web app
- The tuner is a Progressive Web App that can be installed from a browser without an app store download.guitartuner.io · read 30 Sep 2026
- Instrument support
- Dedicated pages cover guitar, bass, five-string bass, six-string bass, baritone ukulele, low-G ukulele and standard ukulele tuning.guitartuner.io · read 15 Oct 2026
- Limit: microphone environment
- The product's own instructions say stable readings depend on a quiet room, one clear string and muting nearby strings.guitartuner.io · read 15 Oct 2026
