Chord ON: Guitar Chords, Tuner
Progressions & Shape Finder
Only for iPhone
Free · In‑App Purchases
iPhone
New Chord Patterns tab - 20 progressions, from the 4536 money chords to canon and 12-bar blues, in any key. The shape finder now draws a real fretboard.
Find, hear, and practice guitar chords. No ads, no subscription.
4536, canon, twelve-bar blues - twenty progressions people actually play, in
any key. Don't know a chord's name? Tap the shape you are holding and Chord ON
tells you. Tuner and chord-change practice are in the same app, and all of it
works offline.
Every shape is automatically verified: that its notes spell the chord, that the
root is in the bass, and that the stretch is within reach.
■ WHAT MAKES THIS DIFFERENT
· No subscription — buy once, keep it. No recurring charges.
· No ads — not even in the free version.
· Offline — chord lookup, playback, shape search, tuning and practice all work
without a connection. (Purchasing or restoring Pro needs the App Store.)
· No auto-renewal — Chord ON Pro is a one-time purchase.
■ CHORD PATTERNS (all free)
The progressions you reach for when writing or backing a song, in any key.
· The 4536 money chords — all four variants: plain, 2-5-1, III7, 4531
· Canon, the fifties progression, turnarounds, twelve-bar blues
· Jazz, gospel, rock and Andalusian progressions — twenty in all
· Change the key and every chord follows: twelve keys, major and minor
· The seven diatonic chords of the key stay pinned at the top
· Hear it, or save it as one of your own
■ CHORD DICTIONARY
· 12 roots x 22 chord qualities
· Multiple ways to play each chord, from open position up the neck
· A common standard fingering is shown first
· Color-coded fingers, numbered too, so they read for colorblind players
· Hear it — strum or arpeggio
· Interval labels (R, 3, b7) to understand how a chord is built
· Chord names explained — why this chord is called what it is called
■ FIND BY SHAPE
Tap the strings the way you are holding them and Chord ON names the chord.
Strings are drawn as strings — the 6th thick, the 1st thin — with position
markers where a real fretboard has them.
That chord you can play but can't name — now you can look it up.
■ TUNER (every tuning, free)
· Detects which string you played through the microphone
· A headstock diagram shows which peg to turn, and which way
· Supports both 3+3 (acoustic) and 6-in-line (electric) headstocks —
they turn in opposite directions
· Standard, Drop D, Half-Step Down, Whole-Step Down, Open G, Open D, DADGAD
— all seven tunings are free
■ PRACTICE TOOLS
· Build and save chord progressions
· Chord transition trainer — change chords in time with a metronome
· One Minute Changes — sixty seconds, counted by ear through the mic
· Tap the tempo — tap along with a song to find its BPM
· Backing loop — the progression keeps playing so you can play over it
· Capo support — the shape you hold and the chord that sounds, side by side
· Left-handed mode — diagrams mirrored
■ FREE, FOREVER
· The whole chord dictionary — 12 roots, 22 qualities, every included shape
· All twenty chord patterns, transposed to any of the twelve keys
· Find by shape
· Chord playback
· The whole tuner — all seven tunings
· Capo
· Left-handed mode
· Interval labels
· Up to 2 saved chord progressions
· Tap the tempo — find a song's BPM by tapping along
· Listening to a progression once
■ CHORD ON PRO (one-time purchase)
· Chord transition trainer — change chords in time with a metronome
· One Minute Changes — the app counts your chord changes by ear
· Backing loop — a progression looped with five strum patterns
· Unlimited saved progressions
· Alternate-tuning fingerings in the chord dictionary
· Family Sharing supported
All seven tuner modes are free. Pro adds alternate-tuning fingerings to the
chord dictionary.
Buy it once. It is not a subscription.
■ A PROMISE
Everything that is free today stays free. It will not move behind the paywall
later.
Available in English and Korean.
Contact: tonbonami@gmail.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
BACKING LOOP (Pro)
A progression that keeps going until you stop it, so there is something to
play or sing over.
- Five strum patterns: downstrokes, eighths, ballad, shuffle, muted sixteenths
- The arrows show what the picking hand does (eighths is D . D U . U D U)
- Change the pattern or the tempo while it plays and it switches at once
- Tap the tempo to find a song's BPM
- Chord Patterns tab, any progression, then Backing loop
THE SOUND WAS REBUILT (everywhere in the app)
Playback, chord detail and the loop all use the new string model.
- Pitch is now correct. High notes were ringing up to twenty-three cents
sharp, so chords beat against themselves and sounded synthetic
- Fixed clipping. Overlapping notes were summing past full scale
- Much louder
- Longer ring and a softer attack
The developer, Woosoo Kim, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Woosoo Kim
- Size
- 2 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Chord ON Pro $6.99
- Copyright
- © 2026 Woosoo Kim

