GuitarTuner.io
GuitarTuner.io is a browser-based tuner for acoustic guitar, electric guitar, and bass.
What GuitarTuner.io 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, showing whether a note is sharp, flat, or in tune. The site lists 69 tuners spanning 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. The tuner is free in a browser, with no account, paid upgrade, or app download required. It can be installed as a Progressive Web App and used offline after installation and caching. GuitarTuner.io also includes an interactive chord library with audio playback and a metronome with adjustable tempo, time signatures, and visual feedback. A modern browser and microphone are required. The site lists support for iPhone, Android, Windows, Mac, and Chromebook. Its proposed native iPhone and Android Pro app is still a demand test and is not available to buy.
Good
- 69 tuners cover multiple instrument and tuning types.
- Custom tunings can use any number of strings and notes.
- Can work offline after installation and caching.
- Includes chord diagrams, audio playback, and a metronome.
Watch out
- Requires a modern browser and microphone.
- Native iPhone and Android Pro app is not yet available.
Who it suits
It suits guitar and bass players who want browser-based tuning or custom tunings without creating an account. Players looking for practice aids can also use its chord library and metronome.
Verdict
GuitarTuner.io combines a no-account browser tuner with a wide range of listed tunings and basic practice tools. Offline use depends on installing and caching the web app first.
Plans and prices
From GuitarTuner.io's own pricing page, checked 15 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free web tuner | Free | browser tuner · no account · no paid upgrade · microphone required · free forever |
| GuitarTuner Pro (proposed) | $4.99, paid once | native iPhone and Android app concept · demand test only · not available to buy · lifetime |
The facts
Each one read from GuitarTuner.io's own pages, with the date it was checked.
What it does
- Account requirement
- The browser tuner is presented as usable without an account or paid upgrade.checked 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.checked 15 Oct 2026
- Analytics and hosting
- Google Analytics and Netlify are identified as third-party services used for usage analysis, hosting and content delivery.checked 15 Oct 2026
- Audio processing
- The site says microphone audio is processed in the browser to provide tuning feedback.checked 30 Sep 2026
- Chord categories
- The chord library includes major, minor, seventh, suspended, power and barre chord groups.checked 15 Oct 2026
- Chord library
- The chord library provides interactive diagrams, multiple chord variations and audio playback.checked 15 Oct 2026
- Cookies
- Cookies are used for visitor tracking and preferences such as favorite tunings and custom settings.checked 15 Oct 2026
- Creator
- Official pages identify John Sorrentino as the creator.checked 15 Oct 2026
- Creator employer
- The GitHub profile lists XSELL Technologies.checked 15 Oct 2026
- Creator GitHub activity
- The profile shows 136 stars, 92 followers and 24 accounts followed.checked 15 Oct 2026
- Creator location
- John Sorrentino's public GitHub profile lists Chicago, Illinois.checked 15 Oct 2026
- Creator repositories
- The GitHub profile shows eight repositories.checked 15 Oct 2026
- Custom tunings
- Users can create custom setups with any number of strings and notes.checked 15 Oct 2026
- Favorites
- Favorite tunings can be starred for quick access and are stored as local preferences.checked 15 Oct 2026
- Instrument support
- Dedicated pages cover guitar, bass, five-string bass, six-string bass, baritone ukulele, low-G ukulele and standard ukulele tuning.checked 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.checked 15 Oct 2026
- Limit: offline preparation
- Offline use depends on first loading or installing the web app so its assets can be cached.checked 15 Oct 2026
- Local audio processing
- The privacy policy says microphone audio is processed locally with Web Audio APIs and is not recorded, stored or transmitted.checked 15 Oct 2026
- Local storage
- Favorite tunings, custom configurations and interface preferences are saved in the browser's local storage.checked 15 Oct 2026
- Metronome
- The metronome offers adjustable tempo, multiple time signatures and visual feedback.checked 15 Oct 2026
The company
- Company details
- The opened maker pages identify the creator but do not state a headquarters or founding year.checked 30 Sep 2026
- Maker
- The site identifies John Sorrentino as its creator.checked 30 Sep 2026
Where it runs
- Installable web app
- The tuner is a Progressive Web App that can be installed from a browser without an app store download.checked 30 Sep 2026
- Limit: native apps
- There is no purchasable native iPhone or Android app; only a proposed $4.99 lifetime concept is shown.checked 15 Oct 2026
The full review of GuitarTuner.io
Overview
GuitarTuner.io is a browser tuner for guitar and bass players who want alternate tunings without installing a native app. Its breadth of tuning choices and built-in practice tools make it more useful than a single-purpose pitch checker, though it depends on a microphone-equipped device and browser.
Key features
Tuning range
The 69 free tuners cover standard, drop, open, modal, bass, ukulele, mandolin, banjo and extended-range tunings. That range suits players who regularly switch setups or instruments; custom tunings with any number of strings and notes extend it further. Real-time pitch detection identifies notes as sharp, flat or in tune, giving clear feedback without requiring a paid upgrade or account.
Practice tools
The chord library pairs interactive diagrams with audio playback, while the metronome offers adjustable tempo, time signatures and visual feedback. These are useful companions for routine practice, but the site’s described tools do not amount to a full lesson or recording suite.
Install and offline use
As a Progressive Web App, GuitarTuner.io can be installed from a browser rather than an app store. Offline use works once the app has been installed and cached, so it is not a dependable offline option before that setup. A modern browser and microphone are required.
Pricing
The Free web tuner costs nothing, billed Free forever. It includes the browser tuner and requires neither an account nor a paid upgrade. That is a strong fit for occasional tuning and regular practice alike, with no stated free-plan cap.
GuitarTuner Pro (proposed) is $4.99, paid once, billed Lifetime, for a proposed native iPhone and Android app. It is only a demand test and nothing is available to buy, so it is not a current upgrade option. The browser tuner remains the practical choice for anyone who wants GuitarTuner.io now.
Platforms
The browser tuner is offered for Android, iOS, macOS and Windows, and the install page also names Chromebook. Supported devices need a modern browser and microphone. The installable web app can work offline after installation and caching; a native iPhone or Android Pro app is not yet available.
Who it's for
GuitarTuner.io suits players who want free browser access, a broad selection of tunings, or one lightweight place for tuning and basic practice support. It is less suitable for someone who needs an immediately available native app or offline access without first installing and caching the web app. The site earns a commission if users sign up for its linked Guitar Tricks offer, at no extra cost.
Pros and cons
- Pro: 69 tuners and custom tunings accommodate unusual setups and instruments beyond standard guitar.
- Pro: No-account browser access and a free-forever plan remove purchase and sign-up friction.
- Pro: Chord playback and a configurable metronome add practical practice aids alongside tuning.
- Con: Offline use requires installing and caching the web app first.
- Con: The proposed native Pro app cannot yet be purchased, so users seeking a native app must choose elsewhere.
Alternatives
For more tuner options, browse Musical Tuner Apps.
- ChromTuner is a sensible alternative for chromatic tuning with an LED meter, whether in its free browser tuner or free iPhone app.
- Centerline is worth considering for its chromatic range of 62–800 Hz, four display views and guitar mode with six views; its free Chromatic plan is a lower-commitment starting point.
- JustATuner is a free alternative for Linux, macOS and Windows users.
- Fender Tune is a free Android and iOS tuner; Tune Plus requires a Fender account.
- n-Track Tuner offers a free Android and iOS version, with a $2.99, paid once Pro version for those considering a paid upgrade.
- DaTuner is an Android option with a free version that includes ads and fewer features than Premium.
- Chroma Ad-Blocker is another free option for Windows, macOS and Linux.
- Cifra Club Tuner is a freemium alternative for web, iOS and Android.
Verdict
Choose GuitarTuner.io if you want a free, no-account browser tuner with unusually broad tuning coverage and useful chord and metronome tools. Its main trade-off is that offline access takes setup and its proposed native app is not yet for sale; those needing an immediately available native tuner should look elsewhere.
Getting started
- Open https://guitartuner.io/ in a modern browser on a supported device
- Use a device with a microphone
- Choose a listed tuning or create a custom tuning
- Install the Progressive Web App from the browser if desired
- Cache the installed app for offline use
Questions
How much does GuitarTuner.io cost?
The Free web tuner is free and is billed Free forever. The proposed GuitarTuner Pro is $4.99, paid once for lifetime, but it is not yet available to buy.
Can I use it without an account?
Yes. The browser tuner is free to use without an account or paid upgrade.
Which devices does it support?
The install page lists iPhone, Android, Windows, Mac, and Chromebook devices with a modern browser and microphone. The platforms list also includes iOS, macOS, web, and Windows.
Can it work offline?
The install page says the app works offline once it has been installed and cached.
Is there a native phone app?
A native iPhone and Android Pro app is a demand test only and is not yet available to buy.
Who created GuitarTuner.io?
The site identifies John Sorrentino as its creator.
Alternatives to GuitarTuner.io
- 1
ChromTuner
Free planiOSWebmacOS7.1$6.99 one-time - 2
Centerline
Free planAndroidiOSmacOS7.0$3.99 one-time - 3
Intunator
AndroidiOS7.0From €17.99 a year - 4
Cifra Club Tuner
Free planAndroidiOSWeb6.9Free plan - 5
insTuner
Free planiOSmacOS6.8$3.99 one-time - 6
LunaTuna
Free planiOSmacOS6.8$2.99 one-time