Why is low bass harder to detect?

E1 is about 41.2 Hz at A = 440; low B0 on a five-string is about 30.9 Hz. A low note gives fewer cycles per sample frame and is more affected by microphone noise, room resonance and upper harmonics. The detector uses a longer frame on devices with higher sample rates. Pluck one string, mute the others and let the attack settle. A browser input or instrument signal may still fail to deliver a clear fundamental.

How do I compare the 12th-fret harmonic correctly?

Choose Selected string, pick the string, then enable Compare 12th-fret harmonic. The target and tone move exactly one octave up: at A = 440, E2 is about 82.4 Hz, A2 110.0 Hz, D3 146.8 Hz and G3 196.0 Hz. The cents bar then compares with that deliberate harmonic target instead of jumping to a different open string. Turn the option off to compare the open string again.

Can I tune a five- or six-string bass?

Choose Five-string bass for B0 E1 A1 D2 G2, or Six-string bass for B0 E1 A1 D2 G2 C3. These are distinct targets with their own chips, frequencies and tones. B0 lies close to the detector’s nominal 30 Hz lower limit; when its fundamental will not lock, select B0 and use the deliberate octave-harmonic target B1 instead.

Which notes are bass Drop D, Drop C and D standard?

Bass Drop D is D1 A1 D2 G2. Bass Drop C is C1 G1 C2 F2. Bass D standard is D1 G1 C2 F2. The first changes only the lowest standard string; the other two also change the upper strings. Select the intended target set explicitly. These presets do not determine whether your instrument’s strings and setup suit that tuning.

Can I use a direct USB input or an upright bass?

A USB interface works when the browser exposes it as an audio input; choose it after granting audio permission. Standard four-string upright bass uses E1 A1 D2 G2 too. Pluck one note at a time and use the target appropriate to your instrument. The tool does not provide physical hardware or adjust tuning pegs.

Can I play a reference without allowing microphone access?

Yes. Each string chip generates a two-second sine reference at the selected A = 432, 440 or 442 pitch. Playback accuracy depends on the device clock. Compare by ear, or permit microphone input for a measured reading.

Bass Tuner

This page opens on four-string bass E1 A1 D2 G2. Play an open string through a microphone or a browser-visible USB audio interface, or press a note to hear its reference tone by ear. Nearest string follows the closest open-string target; Selected string locks the target. Its 12th-fret harmonic option compares one octave above that selected string. Five- and six-string bass, bass Drop D, Drop C and D standard are separate choices in the tuning menu. Standard four-string upright bass and bass ukulele use these same E A D G targets. Audio is processed in the page, with no recording or upload.

Tune with your microphone

Your browser asks for permission first, because no page may listen without it. The samples are read in the page and dropped: nothing is recorded and nothing is uploaded.

Nothing is recordedNothing is uploadedThe stream closes when you stopNo account, nothing installed

Tuning: Tuning

Reference

Input

Compare with
Reference / selected string

The cents bar follows the nearest open string in the selected tuning. Use Selected string to keep a fixed target.

The microphone is closed. Press Start to tune with it, or Play to hear a reference tone.

Why the browser asks permission first. A page cannot listen until you allow it, and the prompt is your browser's, not this site's. Allow it, play one string on its own, and the note should appear within a moment. The tuner reads the samples as they arrive and throws them away: there is no recording, and the stream closes the moment you press Listening or leave the page. Noise suppression and automatic gain are requested off, because a gate that mutes the room between notes, or a gain that rides a decaying string, gets between the detector and the string.

Strings in each tuning

Every listed frequency here is at A = 440, the reference chosen above, and sets the generated reference tone. Physical playback also depends on your device clock. Any string is tuned the same way: play it, watch the bar, and turn the peg until the needle sits in the green. Sharp means the measured pitch is higher than the target; flat means lower. Ukulele high G is re-entrant, so its first listed string is not the lowest pitch.

Tuning	Strings in instrument order	Frequencies
Standard	E2 A2 D3 G3 B3 E4	82.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz
Drop D	D2 A2 D3 G3 B3 E4	73.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz
Half step down	Eb2 Ab2 Db3 Gb3 Bb3 Eb4	77.8 Hz, 103.8 Hz, 138.6 Hz, 185.0 Hz, 233.1 Hz, 311.1 Hz
Bass	E1 A1 D2 G2	41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Whole step down	D2 G2 C3 F3 A3 D4	73.4 Hz, 98.0 Hz, 130.8 Hz, 174.6 Hz, 220.0 Hz, 293.7 Hz
Open D	D2 A2 D3 F#3 A3 D4	73.4 Hz, 110.0 Hz, 146.8 Hz, 185.0 Hz, 220.0 Hz, 293.7 Hz
Open C	C2 G2 C3 G3 C4 E4	65.4 Hz, 98.0 Hz, 130.8 Hz, 196.0 Hz, 261.6 Hz, 329.6 Hz
C standard	C2 F2 Bb2 Eb3 G3 C4	65.4 Hz, 87.3 Hz, 116.5 Hz, 155.6 Hz, 196.0 Hz, 261.6 Hz
Baritone B standard	B1 E2 A2 D3 F#3 B3	61.7 Hz, 82.4 Hz, 110.0 Hz, 146.8 Hz, 185.0 Hz, 246.9 Hz
Double drop D	D2 A2 D3 G3 B3 D4	73.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 293.7 Hz
Five-string bass	B0 E1 A1 D2 G2	30.9 Hz, 41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Six-string bass	B0 E1 A1 D2 G2 C3	30.9 Hz, 41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz, 130.8 Hz
Bass drop D	D1 A1 D2 G2	36.7 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Bass drop C	C1 G1 C2 F2	32.7 Hz, 49.0 Hz, 65.4 Hz, 87.3 Hz
Bass D standard	D1 G1 C2 F2	36.7 Hz, 49.0 Hz, 65.4 Hz, 87.3 Hz
Ukulele high G	G4 C4 E4 A4	392.0 Hz, 261.6 Hz, 329.6 Hz, 440.0 Hz
Ukulele low G	G3 C4 E4 A4	196.0 Hz, 261.6 Hz, 329.6 Hz, 440.0 Hz
Baritone ukulele	D3 G3 B3 E4	146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz

Accuracy. Autocorrelation resolves synthetic steady tones above 80 Hz to within one cent. Microphone noise, harmonics and a decaying string can widen or shift readings. Reference tones use equal-tempered target frequencies; playback depends on the device clock. No audio is recorded or sent anywhere.

Common questions

Why is low bass harder to detect?: E1 is about 41.2 Hz at A = 440; low B0 on a five-string is about 30.9 Hz. A low note gives fewer cycles per sample frame and is more affected by microphone noise, room resonance and upper harmonics. The detector uses a longer frame on devices with higher sample rates. Pluck one string, mute the others and let the attack settle. A browser input or instrument signal may still fail to deliver a clear fundamental.
How do I compare the 12th-fret harmonic correctly?: Choose Selected string, pick the string, then enable Compare 12th-fret harmonic. The target and tone move exactly one octave up: at A = 440, E2 is about 82.4 Hz, A2 110.0 Hz, D3 146.8 Hz and G3 196.0 Hz. The cents bar then compares with that deliberate harmonic target instead of jumping to a different open string. Turn the option off to compare the open string again.
Can I tune a five- or six-string bass?: Choose Five-string bass for B0 E1 A1 D2 G2, or Six-string bass for B0 E1 A1 D2 G2 C3. These are distinct targets with their own chips, frequencies and tones. B0 lies close to the detector’s nominal 30 Hz lower limit; when its fundamental will not lock, select B0 and use the deliberate octave-harmonic target B1 instead.
Which notes are bass Drop D, Drop C and D standard?: Bass Drop D is D1 A1 D2 G2. Bass Drop C is C1 G1 C2 F2. Bass D standard is D1 G1 C2 F2. The first changes only the lowest standard string; the other two also change the upper strings. Select the intended target set explicitly. These presets do not determine whether your instrument’s strings and setup suit that tuning.
Can I use a direct USB input or an upright bass?: A USB interface works when the browser exposes it as an audio input; choose it after granting audio permission. Standard four-string upright bass uses E1 A1 D2 G2 too. Pluck one note at a time and use the target appropriate to your instrument. The tool does not provide physical hardware or adjust tuning pegs.
Can I play a reference without allowing microphone access?: Yes. Each string chip generates a two-second sine reference at the selected A = 432, 440 or 442 pitch. Playback accuracy depends on the device clock. Compare by ear, or permit microphone input for a measured reading.

Autocorrelation resolves synthetic steady tones above 80 Hz to within one cent. Microphone noise, harmonics and a decaying string can widen or shift readings. Reference tones use equal-tempered target frequencies; playback depends on the device clock. No audio is recorded or sent anywhere.