StringLab: Guitar & Bass Tuner

21DigitalAI

In-app purchases

About this app

StringLab is a fast, accurate tuner for guitar, bass, and ukulele — built for players who care about getting it exactly right.

Play a string and the StringLab guitar tuner instantly locks onto the note. It automatically detects which string you're tuning and shows you precisely how far you are from in tune and which way to turn the peg — no tapping between strings, just tune and play.

A GUITAR, BASS & UKULELE TUNER IN ONE
• Guitar tuner with a full library: Standard, Drop D, Open G, Open D, DADGAD, and many more
• Bass tuner for 4-, 5-, and 6-string basses
• Ukulele tuner: Standard, Low G, Baritone, and more
• Chromatic tuner — tune any instrument to any note, free for everyone

FEATURES
• Automatic string detection — play any string and StringLab finds it
• A huge library of alternate tunings — standard, drop, and open
• Custom tunings — save your own and recall them instantly
• Instrument rigs — keep multiple setups ready and switch in one tap
• Adjustable reference pitch (A4 calibration)
• Virtual capo — transpose your tuning up or down by semitones, like a capo on any fret
• Clean, readable gauges in several styles
• Built-in pitch pipe
• Metronome to keep time
• Light and dark themes

Whether you play electric guitar, acoustic guitar, bass, or ukulele, StringLab gets you in tune fast and keeps you there. It's a precise chromatic tuner and a full alternate-tuning library in one app.

STRINGLAB PRO (one-time purchase — no subscription, ever)
• The complete tuning library for guitar, bass, and ukulele
• Premium gauge styles: Target, Precision, Trail, Dials, and Pulse
• Metronome and a custom theme editor
• Unlimited custom tunings and saved instrument rigs
• Extended A4 calibration and transpose range

Tune up. Play in tune. StringLab.

What’s new

Guided tuning is now automatic — just play, and each string lights up as you bring it in tune. Redesigned the string indicators, sharpened Chromatic mode (clear flat/sharp direction + octave safety), and made the Chromatic tuner free for everyone. Plus polish and fixes.