Walk real changes on the double bass, and see exactly how in tune you played them.

Walking Bass Trainer draws the chords, keeps the time, and listens through the microphone while you play. Each tone of the chord lights up as you find it, and every note is measured against where it should have been - in cents, so you can watch your intonation while you walk the line.

Built for the double bass

Pitch detection is tuned to the instrument's own range, from the open E string up through thumb position. The low E that defeats general-purpose tuner apps sits comfortably inside what this one is listening for, with room beneath it - so a string that has gone flat still reads as an E rather than dropping out altogether.

Preparation for jazz changes

Three ways to practise, each aimed at a different part of the harmony:

- ii-V-I: the cell that most jazz standards are assembled from. Learn to hear one coming and a great deal of the repertoire opens up at once, which is why it gets a mode of its own - a three-bar cycle that lands in a different key every time round. Minor turnarounds come up alongside major ones, so the half-diminished chord stops being the one you have to stop and think about.
- Key: diatonic seventh chords inside a key you choose, with an optional secondary dominants setting for when you want the harmony to travel.
- Random: any root, with the qualities you enable - maj7, min7, dominant 7, m7b5, dim7, aug, min-maj7, sus2 and sus4.

The next chord is always on screen beneath the current one, so you practise reading ahead into the change rather than reacting to it once it has arrived.

Ear training, not just finger training

Every chord sounds as it appears, played on piano, so you are always hearing the harmony you are walking over instead of reading a symbol in silence. Switch on the chord tone beep and each note you land that belongs to the chord answers back, with a longer chime when you have found them all - which means you can practise with your eyes off the screen and your ears on the bass.

The connection you are building is the one that matters on the stand: chord symbol, to sound, to a place on the fingerboard, without stopping to spell it out first.

Intonation you can see

A double bass has no frets and no excuses. Every chord tone you play gets its own meter showing how many cents sharp or flat it landed, graded the same way throughout the app: dead on, close, or worth another look. Finding the right note and playing it in tune are two different achievements, and they are scored separately.

Time, at your speed

- Tempos from 20 to 180 BPM
- A swung jazz drum loop, from a very slow 40 BPM up to 160
- Or a plain metronome click, whichever you practise better against
- Piano chord playback, so you can hear the harmony you are walking over

The slow end is not an afterthought. Intonation is learnt slowly, and the app is at its best at tempos where you can hear every note land.

A tuner, built in

Intonation feedback is only worth having if the instrument is in tune first, so there is a proper tuner one tap away.

Progress worth looking at

The app records the days you practise and builds a streak. It tracks how far your notes sat from their targets each week, charts that across the months, and tells you if your playing has developed a consistent lean flat or sharp - the one reading you can take straight to the instrument.

Light and dark

The app follows your phone's appearance, so it reads on a music stand in daylight and does not blind you in a dark rehearsal room.

Everything stays on your device

No account, no ads, no internet connection. The app does not request internet permission at all, so your practice history never leaves the phone. Open it and play.