The tuner is already set to Open C: play each string and get it green. Below, which strings change from standard tuning and their frequencies.
Tap “Turn on microphone” and play a note.
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The other strings stay as in standard tuning. Dropping several strings lowers the total tension and the neck shifts a little: go round once more when you finish.
The open strings ring C major across a very wide low range. Popular in acoustic folk and ambient guitar writing.
| String | Note | Frequency (A = 440 Hz) |
|---|---|---|
| 6 | C2 | 65.41 Hz |
| 5 | G2 | 98.00 Hz |
| 4 | C3 | 130.81 Hz |
| 3 | G3 | 196.00 Hz |
| 2 | C4 | 261.63 Hz |
| 1 | E4 | 329.63 Hz |
The same tuner on iPhone, Apple Watch and Android, offline, with an instrument catalogue and every string turning green within ±5 cents. Plus a metronome, a spectrum analyzer and a chord and key detector. Free, no account.
Get it on Google Play Download on the App StoreC2 G2 C3 G3 C4 E4, from the 6th string to the 1st, with the reference A at 440 Hz.
From standard: String 6: E2 → C2, 4 semitones down; String 5: A2 → G2, 2 semitones down; String 4: D3 → C3, 2 semitones down; String 2: B3 → C4, 1 semitone up. Use the tuner on this page, which is already set to the notes of Open C.
Not for one or two semitones down. If you go lower, slightly heavier strings keep them from going slack and buzzing.