Bass Tuner
This free bass tuner hears all the way down to a 5-string's low B. Plug in nothing — open the page, allow the mic and tune: standard, drop and half-step-down presets, reference tones, and a needle that stays steady on long bass notes.
Auto mode finds the closest string in the selected tuning; chromatic mode tunes to any of the twelve notes, down to the low B of a 5-string. All analysis happens locally in your browser — no audio is recorded or uploaded.
Why Tune Your Bass Here?
Bass strings are long, thick and slow — their notes sit at the bottom edge of what most tuners can hear, and a rushed analyzer octave-errors exactly where you need it most. This tuner is built for those frequencies first.
🎸 Made for low frequencies
The analysis window is doubled compared to a guitar tuner, so the 41 Hz low E — and the 31 Hz B of a 5-string — locks in instead of flickering between octaves.
🎚️ Real bass tunings
Standard, Drop D, Drop C, Drop B, half-step and whole-step down, plus 5- and 6-string presets — the string buttons and headstock follow your choice.
👂 Train your ears too
Every string has a reference tone. Tune by mic when you can, by ear when you must — students who do both settle into pitch faster.
How to Tune Your Bass
With the Microphone
- Choose your tuning and tap the green button.
- Pluck an open string and let it ring — the needle shows cents off; the big note name confirms which string it heard.
- Adjust in small key turns: flat → tighten, sharp → loosen, green ✓ within ±5 cents.
By Ear with Reference Tones
- Tap a string button to hear the target pitch from your speaker.
- Match the open string to it — beats between the two sounds slow to nothing as you approach the pitch.
- Finish with the mic if available to confirm you are inside the green zone.
Features
🎯 ±5-cent accuracy band
A clearly marked green zone and needle that never freezes — you always see the live pitch, in tune or not.
🎚️ Eight bass presets
Standard, three drops, two shifted standards, 5- and 6-string — grouped in one dropdown.
🎹 Chromatic fallback
Any tuning not listed? Chromatic mode reads the nearest of all twelve notes across the bass range.
🔊 Reference tones
Tap any string for its pitch — and while it sounds, the mic listens past it so the speaker can't confuse the needle.
🔒 Nothing uploaded
Pitch detection runs entirely in your browser. No recording, no account, no watermarks.
📱 Works on phones
Tune at a rehearsal, in the studio or at home — the tuner fits any screen with a mic.
What Bassists Say
"Every phone tuner I tried gave up on my low E — this one locks onto 41 Hz and holds it steady while I turn the key. The drop-C preset alone saved me a setup trip."
Marcus L.
Weekend Warrior, Drop C Enthusiast
"I teach beginner bass students and send them here first. The reference tones train their ears while the needle trains their hands — and it works on the school Chromebooks."
Tessa W.
Bass Instructor, Middle School Band
"Tuned my 5-string in one pass, B to G. Only wish I had found it before I bought a clip-on tuner that drifts with room temperature."
Dave K.
5-String Player, Church Band
Frequently Asked Questions
Can this tuner detect the low E and low B of a bass?
Yes. The analyzer runs a wider analysis window than a guitar tuner needs — two full cycles of a 26 Hz tone — so the 41.2 Hz low E of a 4-string and even the 30.9 Hz low B of a 5-string are detected reliably in a reasonably quiet room.
Why does my phone clip-on tuner struggle with bass but this works?
Low bass notes have very long cycles, so a tuner needs a longer listening window to see two full cycles — many cheap tuners cut the window short to feel responsive and then octave-error on bass. This tuner uses a doubled window at the cost of a slightly slower, steadier response.
How do I tune a 5-string bass?
Pick the 5-String preset (B-E-A-D-G) and tune low to high. The B string is the trickiest: tune it slowly in small key movements and check it twice, because such a thick string drifts as it settles.
Is this bass tuner free, and is my microphone recorded?
Free with no account. The audio is analyzed live in your browser and never recorded or uploaded — close the tab and it is gone.
What is the difference between auto and chromatic mode?
Auto mode snaps the reading to the closest string of your selected tuning and lights up that string on the headstock. Chromatic mode shows the nearest of all twelve notes, which is what you want for tunings not listed in the presets.
In Tune — Now Make Some Noise
A tuned bass is the foundation; the rest of the toolkit is upstairs. Play a groove, sketch a bassline, or check the whole band's intonation.
Jam on the virtual drums, write the riff in the music sequencer, find its chords with the chord finder, tune the six-string with the guitar tuner, or warm up your voice with the voice rater.