Universal online guitar tuner

Yes. TuneUniversal works on any modern smartphone or tablet browser that supports microphone access. On iOS you need Safari 14.3 or later; on Android, Chrome or Firefox work best. Make sure to grant microphone permission when the browser prompts you, and keep the phone near the guitar strings for the clearest reading.

The tuner supports a wide range of common tunings: Standard (E A D G B E), Eb Standard, D Standard, Drop D, Drop D#, Drop C#, Drop C, Open D, Open G, and DADGAD among others. You can browse alternative tunings in the tuning hub and open the corresponding preset directly from those pages.

Needle movement is normal when the string is vibrating freely. The reading stabilizes as the note sustains. To get a cleaner reading, pick the string firmly and let it ring without palm-muting, move to a quiet environment, and make sure no other strings are ringing sympathetically. Nylon strings on classical guitars can take longer to settle than steel strings.

No. All pitch detection runs entirely inside your browser using the Web Audio API. No audio data is ever uploaded, stored, or processed on any server. Your microphone signal is used in real time and then discarded.

A well-implemented browser tuner like TuneUniversal is accurate to within a few cents, which is more than sufficient for most guitar playing. Professional hardware tuners offer similar accuracy. The main limiting factor is the quality and placement of your device's microphone — holding the phone or laptop closer to the guitar body or sound hole improves detection significantly.

No installation is required. TuneUniversal runs entirely in the browser. Just open the page, grant microphone access, and start tuning. It works on Windows, macOS, iOS, and Android without any plugins or downloads.

Tune your guitar every single time you pick it up. Strings go out of tune due to temperature and humidity changes, tension settling after playing, and the natural elasticity of the string material. New strings are particularly unstable — they may need retuning every few minutes for the first few days until they break in. A quick tune-up before every practice session takes less than a minute and makes everything you play sound better.

Yes, and it works very well. Hold your phone 15–25 cm from the sound hole and pluck each string cleanly, letting it ring fully. The built-in microphone on modern smartphones is sensitive enough to detect the pitch accurately in a quiet room. Reduce background noise by closing doors and windows, and avoid tuning near fans or air conditioning which can interfere with microphone pickup.

A semitone — the distance between two adjacent frets — is divided into 100 cents. The cent reading tells you exactly how far the string is from perfect pitch: +15 cents means 15% of a semitone too sharp; -10 cents means slightly flat. For general playing, staying within ±10 cents is fine. For recording or ensemble playing, aim for ±5 cents or less. TuneUniversal displays cents in real time so you can make small, precise adjustments.

Always start from the lowest string and work up: low E, A, D, G, B, high E. Tensioning the low strings adds neck tension, which can pull the higher strings slightly sharp. After one full pass, do a quick second check from low E — especially with new strings or after being significantly out of tune. This two-pass method ensures everything settles into tune together.

Room noise or multiple ringing strings can confuse pitch detection. Play one string clearly and let it settle.

For six-string guitar, start with standard E A D G B E before trying Drop D, Eb Standard or open tunings.