Tuner: Guitar, Violin & Bass — a free tuner app for iOS
The screen turns green. You are in tune. That is it.
Tuner: Guitar, Violin & Bass is a free chromatic tuner app for iPhone: play a note, see the nearest note and how many cents you're off, and watch the whole screen turn green the instant you're in tune.
A look inside
Open it and play — the needle centers and the screen turns green the moment you're in tune.
Why it's the fastest way to get in tune
Tuning happens twenty times a day, so every wasted second counts. This app removes all of them.
Opens straight into the tuner
No menus to learn, no instrument pickers, no setup screens. Launch the app and it's already listening — just play a note.
Glance-and-go feedback
The whole screen turns green the instant you're in tune. You can read it from across the room, on a dark stage, mid-soundcheck.
Instant, stable readout
A smooth needle shows the nearest note and your offset in cents — no jitter, no guessing which of three flickering notes it means.
One tuner for every instrument
Despite the name, this isn't just a guitar tuner app. It's truly chromatic: it detects all 12 notes across a wide range instead of listening for a preset list of strings. That means it works equally well as a violin tuner app, a bass tuner, a ukulele or mandolin tuner — and it handles cello, brass, woodwinds, and voice too. It also makes alternate tunings trivial: drop D, open G, half-step down — the tuner doesn't care, it just tells you what note you're playing and how far off you are.
Curious what those notes actually are in hertz? Our note frequency chart lists the exact frequency of every note from C0 to B8.
Your reference pitch, your call
Standard concert pitch puts A4 at 440 Hz, but not everyone tunes there. Many orchestras sit at 442, baroque ensembles go as low as 415, and some players simply prefer 432. The app's A4 reference is adjustable anywhere from 415 to 466 Hz, with 432, 440 and 442 as quick presets — so the tuner adapts to your ensemble instead of the other way around.
An honest tool, nothing else
MusePulse builds tools that measure truthfully instead of flattering you, and this tuner is the purest expression of that idea. The screen turns green when you're in tune — not when you're vaguely close, and not after you've watched an ad or bought a subscription. There is no paywall, no account, and no upsell hiding behind the settings icon. Light and dark themes, seven languages, one job done well.
Don't want to install anything right now? The free MusePulse web tuner runs in any browser. And once your pitch is honest, make your timing honest too: Rhythm Challenge is our metronome that listens to your playing and grades it to the millisecond.
Frequently asked questions
Is the tuner really free?
Yes — 100% free. No ads, no account, no paywall, no locked features. You download it and you tune. That's the whole business model for this app: it's made by musicians who wanted a tuner that just works.
Which instruments does it support?
All of them, effectively. The tuner is fully chromatic — it detects all 12 notes across a wide range — so it works for guitar, bass, violin, cello, ukulele, mandolin, brass, woodwinds and even voice. It also handles alternate and drop tunings, since it isn't limited to preset strings.
Can I change the reference pitch from 440 Hz?
Yes. The A4 reference is adjustable anywhere from 415 to 466 Hz, with 432, 440 and 442 Hz available as common presets. That covers baroque pitch, standard concert pitch, and the slightly higher references many orchestras use.
Is there an Android version?
Not yet — the app is currently iOS-only, and an Android version is planned. In the meantime, the free MusePulse web tuner works in any browser on any device.