Open A Tuning
Open A tuning is E – A – E – A – C♯ – E, from the 6th string to the 1st. The open strings make an A major chord. The 4th, 3rd and 2nd strings each go up a whole step from standard.
Your browser will ask to use the microphone. Choose Allow.
✓ All strings in tune
Tap a string to hear it and tune only that string. Audio is analysed on this device and never uploaded. How it works →
- What it does
- Preset to Open A: hears each string, shows which one and how far to turn it
- What it does not do
- Record or upload audio · detect chords
- Reference pitch
- A4 = 440 Hz, adjustable 415–466 Hz
- Tested with
- 58 studio recordings of 11 instruments (right note on about 95% of frames at normal volume) and test tones from B0 to C6
- Made by
- The Appcellent team
- Updated
- November 2026
Tuner not hearing you?
- Allow the microphone. If you blocked it: in Chrome or Edge, click the icon left of the address bar → Microphone → Allow, then reload. In Safari on iPhone, tap aA → Website Settings → Microphone → Allow. In Firefox, click the crossed-out microphone in the address bar. On a Mac, also check System Settings → Privacy & Security → Microphone for your browser.
- Open the page in Safari or Chrome. In-app browsers (Instagram, Facebook, TikTok) often block the microphone.
- Play one note at a time, louder. Hold your phone or laptop close to the instrument and let the string ring. A quiet room helps.
- Wrong octave or jumping notes? Let the attack fade for a moment — the reading settles once the note is steady.
- No microphone at all? Tap a string button to hear its note and tune by ear.
Open A notes and frequencies
Open A tuning is E2 (82.41 Hz), A2 (110.00 Hz), E3 (164.81 Hz), A3 (220.00 Hz), C♯4 (277.18 Hz) and E4 (329.63 Hz), from the 6th string to the 1st. From standard tuning (E A D G B E): Raise the 4th string from D to E (a whole step); raise the 3rd string from G to A (a whole step); raise the 2nd string from B to C♯ (a whole step). The 6th, 5th and 1st strings stay the same.
| String | Note | Frequency | From standard |
|---|---|---|---|
| 6 | E2 | 82.41 Hz | no change |
| 5 | A2 | 110.00 Hz | no change |
| 4 | E3 | 164.81 Hz | D3 → E3 · up whole step |
| 3 | A3 | 220.00 Hz | G3 → A3 · up whole step |
| 2 | C♯4 | 277.18 Hz | B3 → C♯4 · up whole step |
| 1 | E4 | 329.63 Hz | no change |
About Open A tuning
Open A is a bright slide and blues tuning. It has the same shape as open G, only a whole step higher, so open G songs and licks work the same way.
Because three strings are tuned up, tension rises. Many players get the same notes by tuning to open G and putting a capo on the 2nd fret.
How to tune to Open A
- Press Start tuner above and allow the microphone. The tuner is already set to Open A.
- Play one string at a time. The tuner shows which string it hears and whether to tune up or down.
- Turn the peg until the needle is centered and the note turns green. Tap a string button to hear its target note.
- After all strings are done, check them again — changing tension on one string pulls the others slightly.