D'Tools 4+

D'Addario & Company, Inc.

    • 3.6 • 26 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


Newly updated to support the latest iPhones and iOS 12, D'Tools (formerly Guitar Tools) is the ultimate hand-held utility kit for guitar players of any style or skill level, brought to you by D'Addario & Company, Inc., the world's largest designer, manufacturer and distributor of musical instrument accessories. Enjoy the full functionality of the Chordmaster and Scale Wizard apps, the core features of ProTune and ProTempo. Developed exclusively for iOS by the minds at Audiofile Engineering, D'Tools packs a wealth of easy-to-use, professional-grade guitar utilities into one elegant application for your iPhone or iPod touch.


Explore a library of more than 7,000 guitar chords by simply tapping and strumming the touch screen. View chords in every position up and down the guitar neck and hear each one played back in pristine audio. There's even a "lefty" mode for the oft-neglected southpaw.

You know how to play it, but what do you call it? Select frets and finger positions to discover the proper name for your chord.

Improve your technique by choosing from thousands of scales, modes and arpeggios to practice. Try multiple positions and alternate tunings to boost your versatility. Use "big stretches" for unique, challenging fingerings.

Keep your instrument in tune with a professional-grade digital tuner, powered by Audiofile Engineering's precise AETune™ pitch detection technology. Choose between strobe or needle interface and access dozens of presets.

Keep in time with a hyper-accurate and visually stunning digital metronome. Set tempos numerically or by tapping the touch screen. Choose from multiple sounds and time signatures.


D'Tools was developed by Audiofile Engineering, a leading developer of audio software for OS X and iOS.

What’s New

Version 2.1.1

Improve stability and expand supported notes in Tuner to the bass range.

Ratings and Reviews

3.6 out of 5
26 Ratings

26 Ratings

No shark ,


After last IOS update to iPhone 6, microphone must be switched back on in for this app in Settings or tuner will not work. Go figure.

Original Post:
Flimsy version of Planet Waves Guitar Tools which I used for years. Things from PWGT that would make this a 5 star app:
Give an option to or just make a dark background especially on the tuner. The strobe is much harder to see in current app.
Wood style fretboard was also better for viewing.
As other reviews note, chord finder shows "no chord" for many basic and complex grips, and any chord when you X out an open string. Once a fret marker is placed, that string can not be changed back to open. Hope some of function and style issues are soon resolved. PWGT was an awesome little app; this one, not so much yet.

Matt Lion ,

Best free guitar utility app!

PROS: The chord diagrams are a beginner’s best friend! I often time find myself learning new 7, 9, etc chords. The chord finder is a must for experimenting with different triades and can help creativity and writing. Scales are a god send and decently accurate although I can’t find a 3 per string for the major scale that I use. The app is also FREE.

Cons: The tuner could use a touch up. It isn’t the most accurate, mic sensitivity can me an issue in a loud room. The metronome shuts off if you close the app which is annoying but you can set it to prevent sleep which keeps the app open during play/performance. If these 2 things could get worked on… I’d be one happy camper.

But hey, the app is free so you really can’t complain! I’d recommend Chordify for jamming along chords to songs, Ultimate guitar for tabs, and D’Tools for practice/checking your work.

JMRmusic ,

Useful app with one MAJOR flaw!

For some reason, even in the default setting, the pitch of chords and scales are played 1 whole step higher than the selected tonal center. This needs to be fixed. Other than that, it's a cool app.

App Privacy

The developer, D'Addario & Company, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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