Perfect Guitar Tuner

Review by eFreeware

Perfect Guitar Tuner's distinguishing feature is that it gives you three ways to work instead of one: an automatic mode that listens and identifies the note, a manual mode where you choose the notes yourself, and a play mode that sounds reference tones for ear training. That trio is the reason I would look at this one before the dozens of near-identical tuners on the Play Store.

It comes from o16i Apps, sits in the Music & Audio category, and has been free since it first appeared in June 2014, with an update in August 2025 that the developer lists simply as bug fixes. The install figures are substantial, over five million, and the average rating sits at 4.7 from more than 23,500 ratings.

The app is built for string players rather than for musicians in general. Guitars of the acoustic, electric and bass variety are the focus, with ukulele, violin, viola and banjo presets rounding out the set. If your instrument has strings and you want a straightforward way to get it in tune, this is the sort of tool that fits.

What tuning with it actually involves

The core loop is simple in concept. You play a string, the app works out the frequency, and it points you toward the nearest note so you can adjust the peg. That is the automatic mode, and it is the one most people will spend their time in. The developer pitches it as a matter of seconds per string, which is the right ambition for a tuner: the less time you spend staring at a screen, the better.

Manual mode flips the arrangement. Rather than letting the app decide which note you are closest to, you pick the notes you want to tune against and work through them deliberately. That matters when you are chasing an alternate tuning or setting up an instrument to a specific reference rather than to whatever the app assumes.

Play mode is the one I find most interesting in principle. It plays reference tones for each string so you can match them by ear. That is a slower way to tune than automatic detection, but it doubles as practice: matching a pitch you hear is a skill, and having the tones available in the same app you use for tuning is convenient. Beginners who are still learning what an in-tune string sounds like will get the most from it.

Presets for more than the standard six strings

Standard tuning is the default, as you would expect, but the preset list goes further. Drop D, Open D, Open G and Open A are all included, which covers a good deal of what rock, folk and slide players reach for. Bass players are looked after with presets for four-string and five-string instruments, and there are entries for ukulele, violin, viola and banjo among others.

The app also lets you customize the string set so it matches the tuning you are actually using. That is the detail that separates a tuner you use once from one you keep installed, because alternate tunings are where generic tuners tend to fall apart.

Note naming is handled flexibly too. You can display notes in American or European convention, or use solmization, which matters if you learned your theory in a system that does not use letter names. It is a small thing, but it is the kind of small thing that makes an app feel like it was made by people who play.

Sound quality and pitch calibration

Rather than synthesizing beeps, the app uses real recordings of instrument sounds as its references. The developer promises maximum realism from this approach, and it is a sensible choice: a recorded string has the harmonic content your ear expects, which makes matching it easier than matching a pure tone.

Pitch frequency is adjustable, so you can set the reference away from the default if your situation calls for it. Adjustable calibration is a standard feature on serious tuners for good reason, and this app includes it. It lets you match the app to a fixed reference rather than forcing everything to one number.

The developer also makes a point about enhanced sound recognition for electric guitars, saying the app is correct when identifying frequencies. I would treat any claim of that sort as marketing until you have tried it with your own instrument and your own room, but the intent is clear: this is meant to work with a plugged-in electric as readily as with an acoustic in a quiet bedroom.

Ads, purchases and what the app asks of you

Two things are worth knowing before you install: the app contains ads and offers in-app purchases. That is the trade for a free tuner, and it is a common one.

The app is rated for Everyone and is suitable for musicians at any level, from people picking up a guitar for the first time to those preparing for a show. The developer's own framing puts it at home, on stage and in the studio, which is a broad claim, but the feature set does at least support the idea of using it in more than one setting.

For a tool you might rely on before a gig, that is reassuring, though I would not read more into a short changelog than it says.

Where a tuner like this fits

The obvious audience is someone who plays guitar or bass and wants a tuner on the phone that is already in their pocket. Students working on ear training have a second reason to keep it around, since Play mode gives them reference tones to match without a separate tool. Teachers might find the same feature useful for demonstrating pitch to a student.

Players who move between instruments will get more out of it than someone with a single guitar in standard tuning. The preset list for ukulele, violin, viola and banjo means one app can cover a household or a classroom with mixed instruments, which is a more efficient arrangement than installing several single-purpose tuners.

Someone who only ever tunes one guitar to standard tuning and wants the simplest possible screen will find the extra modes and presets are more than they need. That is not a flaw, but it is worth being clear about what you are getting: this is a tuner with breadth, and breadth is only useful if you have a use for it.

A tuner worth keeping on your phone

Perfect Guitar Tuner gets the fundamentals right and then adds options that many competitors skip. Automatic detection for speed, manual selection for control, reference tones for training, and a preset library that stretches well past standard tuning. The adjustable pitch frequency and the choice of note naming conventions show attention to how players actually work.

The costs are the usual ones for a free app: ads and in-app purchases are present, and you will have to decide whether that trade suits you. The rating average of 4.7 across more than 23,500 ratings suggests a lot of people have made their peace with it.

If you play a stringed instrument and want one app that handles tuning across several of them, this is an easy one to try. If you need nothing beyond a single standard-tuned guitar, the extra capability will not hurt, but it will not do much for you either. For most string players, though, the breadth is the point, and it is what makes this worth a spot on your home screen.

What's new in version 4.0.1

Bugs fixed