Bass Tuner for Teachers

The band is ready to play, but the bass sounds muddy and nobody can tell why. Bass notes are so low that many pupils cannot yet hear whether a string is a little sharp or flat, and a bass that is out of tune pulls the whole band with it. Onlinebasstuner.app is an online bass tuner that runs in the browser on the classroom computer, the smartboard or a pupil’s own phone. Open the page, press Start tuner and play one open string. There is no account, nothing to install and no ads.

Open the tuner

What you get

• A microphone tuner for 4, 5 and 6-string bass. Press Start tuner, allow the microphone and play one open string. The tuner shows the nearest string and how many cents you are off; turn the peg until the needle is in the centre and the display says In tune (within 5 cents). Tap a string button to lock the tuner to that string.
• Five settings. 4-string (E A D G), 5-string (B E A D G), 6-string (B E A D G C), Drop D and Drop C. See 4-string, 5-string, 6-string and Drop D and lower tunings.
• Built for low notes. The low E vibrates about 41 times per second and a low B about 31. The tuner uses a longer analysis window than a guitar tuner and searches down to 27 Hz, below the low B.
• Reference tones, no microphone needed. On Reference tones, tap a string to hear its note, with Volume, Loop every 4 seconds and Play one octave higher (for small speakers) – useful when the classroom speakers cannot play deep bass.
• Reference pitch. A4 = 440 Hz by default; change it only to match an instrument tuned to another A, such as a piano.
• More for the lesson: step by step how to tune a bass, acoustic bass and ukulele bass guides, and a note table with the frequency of every string.
• Help when the microphone is blocked. The tuner explains in plain words what went wrong (blocked, no microphone, busy) and how to allow the microphone in Chrome, Edge, Firefox, Safari, on iPhone/iPad and on Android.

Projector mode

Press Projector mode under the tuner and it fills the screen on a black, high-contrast background, with a very large note name, a large needle and a large cents display, so the whole band can follow from the back of the room. When a string is in tune, the note, needle and message turn green and the text says ✓ In tune, so it does not rely on colour alone. The setting buttons and the string buttons still work. Press Esc or ✕ to leave. If the browser does not allow full screen, the projector view fills the browser window instead. The tuner remembers the setting in this browser only.

Lesson ideas for bass in music class and school bands

Tune together on the board

Put the tuner on the projector and let one pupil at a time play an open string while the class watches the needle. Pupils learn to read “too low / too high” before they can hear it on such deep notes.

Hear it an octave up

Play the E1 string on Reference tones, then switch on Play one octave higher. Ask the class whether it is the same note. It is a simple way to explain octaves – and why a bass sounds one octave below the four lowest strings of a guitar.

Bass and guitar side by side

Show the note table: E A D G on the bass are the same notes as the four lowest guitar strings, one octave lower. If guitars are in the band too, tune them on the sister site Online Guitar Tuner and compare.

Which way do I turn?

Let a pupil turn a peg slowly while the class calls out whether the needle moves towards the centre. If a string is too high, go below the note and tune up to it – the string holds its pitch better.

Tuning monitors before rehearsal

Choose one pupil as tuning monitor each lesson. They tune the band’s basses at the front while you start the warm-up, so rehearsal time isn’t spent on tuning.

Drop D for a song

When a song needs a lower note, switch to Drop D, let the class tune the E string down to D and play the open string before and after. Pupils hear and see what changing a tuning means. Remember to tune back to standard afterwards.

Practice at home

Pupils can open the same page on a phone at home, so they start practice in tune and you know what they are using.

Tips for a noisy room – and for low notes

• One bass at a time. The tuner reads one note at a time, so tune one instrument while the others stay quiet. Mute the other strings with the fretting hand.
• Let the note ring. Bass notes are slow waves; let each note ring for a second or two before you judge the needle.
• Pluck at normal strength. Very hard plucks start sharp for a moment.
• Phone and laptop microphones hear deep notes weakly. At 31 Hz they mostly pick up the overtones of the string. If a low B or low C will not read, hold the phone close to the speaker or the bass, pluck a little harder and tap the string button to lock the tuner to it.
• Unplugged electric bass is quiet. Hold the device close to the strings, near the pickups or the body. Through an amp it is easier: put the microphone near the speaker and keep the volume moderate.
• Check again at the end. Changing one string slightly changes the tension on the neck.

Before your first lesson

The tuner runs in a current browser (Chrome, Edge, Firefox or Safari) on a device with a microphone, at an address starting with https://. The browser asks for the microphone only when you press Start tuner. If the class device is managed by the school, the school’s IT may need to allow microphone access for the site. The reference tones work without a microphone; on small speakers, use Play one octave higher.

Privacy

• No account, no login and no pupil data. No ads on this page.
• The browser only gives the page microphone access after you allow it. Sound is analysed on the device; nothing is recorded, saved or sent, and the microphone switches off when you press Stop or leave the page. See privacy.