Music
Struno: Tuner & Metronome App
Your all-in-one instrument companion: a precise tuner, a powerful metronome, interactive chords and scales — everything you need to practice, learn and perform.
- Free
- iPhone · iOS 17+
- ★ 4.7 on the App Store
About Struno
Struno is your all-in-one instrument companion: a precise tuner, a powerful metronome, interactive chords and scales — everything you need to practice, learn and perform.
Whether you play guitar, bass, ukulele, banjo or mandolin, Struno helps you stay in tune and in time.
Features
Accurate tuner
Fast, real-time pitch detection with smooth visual feedback.
- →Chromatic and instrument-specific modes
- →Animated gauge with particle indicator
- →Reference tone (pitch pipe)
Chords library
Clear, readable diagrams across multiple instruments.
- →Multiple voicings and capo transposition
- →I–IV–V–I, ii–V–I, 12-bar blues
- →Pick a key and practice instantly
Scales & modes
Visualize 12 scales and modes directly on the fretboard.
- →Major, Minor, Pentatonic, Blues
- →Dorian, Mixolydian, Lydian and more
- →Learn patterns, improvise with confidence
Advanced metronome
A flexible, musician-focused metronome.
- →40–240 BPM with tap tempo
- →Time signatures, subdivisions, 6 sounds
- →Tempo Trainer and genre presets
From the blog
How to Tune a Guitar with a Chromatic Tuner: Standard and Drop D
A step-by-step guide to tuning a six-string guitar to standard EADGBE and Drop D with a tuner app, plus the habits that keep it in tune longer.
How to Tune a Ukulele: Standard GCEA, Low G and Baritone DGBE
Learn how to tune a ukulele to standard GCEA with a chromatic tuner, the difference between high G and low G, baritone DGBE tuning and why new strings drift.
How to Practice with a Metronome and Actually Get Faster
A practical method for metronome practice: start slow, raise the tempo a few BPM at a time, use subdivisions and beats 2 and 4, and know when to speed up.
FAQ
Which instruments can I tune with Struno?+
Guitar (6, 7 and 12-string), bass and 5-string bass, ukulele and baritone ukulele, banjo and mandolin — plus a chromatic mode for anything else.
Does the metronome support odd tempos and practice routines?+
Yes. It covers 40–240 BPM with tap tempo, multiple time signatures and subdivisions, and a Tempo Trainer that gradually increases BPM.
Is Struno free?+
Struno is free to download. Optional subscriptions unlock advanced features; pricing is shown in the app before purchase.
Get Struno on iPhone
All-in-one music toolkit: tuner, chords, scales, and metronome