Tune up and keep time, right in the browser
A tuner that listens through your microphone, a page for every common guitar tuning and a metronome that keeps your phone awake. No app to install, no account; the sound is analyzed on your device and never uploaded.
Tuners
Play a note near the microphone; the tuner shows the note and how far to turn.
Guitar tunings
Each page has the tuner set to that tuning, a chart of notes and frequencies.