GuitarTuner.io
GuitarTuner.io: A free, flexible tuner for everyday guitar, bass, and ukulele tuning. Ranked #12 of 32 in Musical Tuner Apps by our editors (6.4/10); pricing: Free plan; best for anyone needing a free cross-platform browser tuner.
At a glance
- Editor score6.4 / 10
- PricingFree plan
- Best forAnyone needing a free cross-platform browser tuner
- Free planYes
- Paid fromNone
- Facts checked21 Sep 2026
Where it wins
- Supports standard, alternate, and custom tunings
- Covers guitar, bass, and ukulele modes
- Works offline after installation or loading
Where it doesn't
- No verified reference-pitch controls
- Limited deeper analysis features
- Offline use requires prior installation or loading
Our verdict on GuitarTuner.io
GuitarTuner.io is a free tuner for guitar, bass, and ukulele that runs in a browser and supports Windows, macOS, iOS, and Android. It uses microphone access and real-time pitch detection to indicate whether a note is sharp, flat, or in tune. The core experience does not require an account or payment, making it suitable for players who want a straightforward tuner across desktop and mobile devices.
Its main strength is tuning flexibility. Alongside standard tuning, GuitarTuner.io supports drop, open, modal, bass, and other alternate tunings, while custom configurations let users select their own notes. Dedicated guitar, bass, and ukulele modes keep the product focused on practical string-instrument tuning rather than broader audio analysis. The installable progressive web app also extends the browser experience to phones and desktop browsers, with local browser audio processing and no recording or transmission of microphone audio.
The published Free plan includes microphone pitch detection, standard and alternate tunings, custom tunings, and offline use once installed. Offline operation depends on first installing the progressive web app or loading the tuner, so it is better suited to planned use than to an entirely unprepared offline session. GuitarTuner.io should appeal to players who value broad tuning coverage, custom note selection, and cross-platform access without payment. Players who need verified reference-pitch controls or more advanced analysis should choose a tuner built around those capabilities instead.
GuitarTuner.io pricing
All 1 GuitarTuner.io plans and prices →
GuitarTuner.io fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Strobe display | Not verified |
| Alternate tunings | Yes |
| Custom reference pitch | Not verified |
| Intonation monitoring | Not verified |
| Offline mode | Yes |
| Available platforms | Both |
| Deployment | Cloud, Mobile |
| Platforms | Web, Windows, macOS, iOS, Android |
| Support | |
| Built for | Solo (editorial estimate) |
| Pricing | Free plan (source) |
| Website | guitartuner.io |
| Facts checked | 21 Sep 2026 |
Alternatives to GuitarTuner.io
- TonalEnergy Tuner & MetronomeA paid, feature-rich practice tuner for musicians who need more than pitch detection.9.3
- CenterlineA capable free tuner with strong guitar workflows and offline analysis.8.8
- Airyware TunerA deep, multi-platform tuner for players who need broad instrument and tuning coverage.7.8
See all GuitarTuner.io alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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