Chordio: compose & learn music
A companion tool for musicians
Free · In-App Purchases
Looking for a spark for your upcoming song?
Introducing Chordio, a powerful tool for composition and music theory that offers an enjoyable and interactive experience. This app allows you to explore chords and scales in a fun and engaging way. It also provides a convenient platform for storing all your distinctive musical chord progressions in a single location. As a result, Chordio becomes an indispensable resource for contemporary music producers, composers, and educators.
Take your music theory knowledge to the next level and create innovative chord progressions for your latest composition. With a range of internal sounds included, you can explore the tool's features without needing any other external equipment.
Connect your MIDI controller to Chordio and see chord names appear on the Grand Staff in real-time as you play. Solo over chord progressions using the built-in sounds, and quickly rearrange or transpose chord progressions on the fly for added flexibility.
Uncover fresh chord sequences for any genre - from hip hop to house and everything in between. Simply drag and drop them into your DAW!
Chordio empowers you to unleash your creativity and take your music to new heights.
The main features are divided into four workspaces:
Composition
• Build-in sequencer to create chord progressions.
• Build-in Chord progression generator.
• Create custom chords, edit existing chords, get chord inversions, and extended chords.
• Drag & Drop to change the song structure.
• Transpose the entire chord progression with a single tap.
• Create a playlist of custom chord progressions.
• Chord Suggestion AI – Get intelligent chord recommendations that fit your existing progression, and seamlessly integrate them into your composition.
• A Chord Types & Vocings panel helps you generate new chords.
• Play-along with a backing rhythm track.
• Save/load songs, export it as MIDl.
• Download chord progressions from a growing collection of Chord Packs.
Scales
• Practice scales with a metronome in all keys.
• Contains more than 40 scales you can work with.
• Staff view for chords and scales.
Modes
• Interactive way to learn what scales are associated with each mode.
• Practice modes in Chordio.
• Change tonic, mode, and layout to discover the relationship between musical notes, chords, and scales.
Music Theory
* In-app theory lessons.
• 3 New Music Theory Quizzes: Note Identification, Interval Recognition & Chord Identification.
Sheet Music
• Adjust the Tempo: Practice at your own speed.
• Loop Key Sections: Focus on tricky parts with ease.
• Practice Hands Separately: Work on left or right hand independently.
• Play in Any Key: Transpose sheet music to suit your preference.
• Customize Tracks: Adjust instrument volumes.
• Jazz Solo: Jam over chord progressions.
• Print Your Scores: Print a PDF version of the score for flexible, hands-on practice.
Lessons
• Learn to play songs at your own pace.
• Download music from a growing collection of Lesson Packs.
• Lessons can be slowed down or pitch changed.
KEY FEATURES:
• MIDI keyboard support.
• Build progressions using the chord generators.
• Export MIDI to your DAW or sequencer.
• Custom chords, edit existing chords, get extended chords.
• Play internal sounds.
• Arpeggio, strum and performance modes.
• Mac version include a detachable resizable Grand Staff, Chord Display, and Keyboard Views.
• Customise the Keyboard highlight color.
• Select chord, to display a range of related scales and chords.
• Tap a note on the Grand Staff to highlight it with a color.
• Choose from selection of backing rhythms that fit specific genres.
• Chord Pattern playback
Always backup your chord progressions!
more Chordio - What's New in This Version - 3.2.3 This update focuses on polish across your settings screens, plus a couple of nice visual touches.
• Redesigned the Keyboard Highlight colour picker with a curated palette, an opacity slider, and a live preview, with one tap through to the full colour picker whenever you want a custom shade.
• Fixed an issue where Sound, Keyboard, and Appearance settings could occasionally show the wrong value on a row after navigating back to that screen.
• Fixed overlapping footer text in Sound settings on certain window sizes.
• The Tools menu now shows at a glance when Harmony Explorer's relationship colouring is turned on, so you always know which view you're looking at.
Thanks for using Chordio. We're always refining the details, so keep the feedback coming.
3.2.3 3 days ago
New content: Salsa Percussion kit and sheet music pack A new Latin percussion kit joins the drum instrument library, along with a brand new Salsa sheet music pack to play along with.
New: Swing for Sheet Music playback Add real groove to your playback. Choose from eighth or sixteenth note swing presets, ranging from a light lift to a full triplet shuffle, and apply it to the treble clef, bass clef, or both. Your notation stays exactly as written, only the feel of the playback changes.
New: Repeat Bars Scores with repeated sections now play the way they're written. Mark a bar range as a repeat and Chordio draws the correct repeat barlines and loops that section automatically during playback.
Also included:
Fixed a crash that could occur when rapidly starting and stopping audio previews.
Fixed an issue where certain repeated notes could sound cut short with swing enabled.
Chord pack previews now stop after 25 seconds, matching Sheet Music previews.
General performance and stability improvements.
Thank you for using Chordio. We're always working on new ways to help you play, practice, and create.
3.2.2 19 Aug
This update adds a rebuilt Backing Rhythm engine, a new Bassline generator, and Key Cycle practice trainer.
Backing Rhythm has been rebuilt with seven professional General MIDI drum kits, including Standard, TR-808, Jazz and Brush. Explore 35+ patterns across Pop, Jazz, Bossa, Salsa, Hip Hop, Trap and more, or create your own beats with the new step editor. You can also import GM drum patterns from your DAW, adjust tempo directly, and easily manage saved patterns.
Bassline adds automatic bass accompaniment that follows your chords in real time. Choose from seven styles, five instruments, adjustable complexity, swing, humanization and octave controls, plus eight ready-made presets and custom preset saving. Practice with chords or bass muted independently.
Key Cycle takes your progression through all 12 keys using cycles of 4ths, 5ths, half or whole steps, minor thirds, or random movement. Step through keys manually or enable automatic advancement.
Active tools such as Backing Rhythm and Bassline are now highlighted in the Tools menu, making it easier to see what's running.
Build rhythms, practice progressions, or create full arrangements with more control and flexibility in Chordio.
3.2.1 11 Aug
This update makes the Sheet Music workspace smarter, more accurate, and more customisable.
Editable Key and Tempo You can now set the Key and Tempo directly from the Score Information panel, and every score will display and play back using these settings. Choose your key from an easy visual picker, and set tempo with a simple dial control.
Automatic Key Change Detection Chordio can now detect key changes within an imported MIDI file (such as those exported from Logic Pro) and display them accurately in the sheet music, complete with new key signatures and clef markings exactly where the change occurs.
General Refinements Various small improvements to the sidebar layout and overall polish, making the app easier and more enjoyable to use.
3.2.0 28 Jul
What's New
Compose, practise, and perform more naturally with new tools designed to make learning and creating music faster than ever.
Chord Pads
Play and audition your chord progressions instantly with the new Chord Pads in the Composition workspace. Simply tap any chord to hear it played back while the corresponding notes are highlighted on the on-screen keyboard. Experiment with different progressions, compare harmonies, and develop ideas more quickly without needing to play every chord manually.
Easier Transposition
A new Transpose control is now available directly from the Sheet Music toolbar. Use the simple plus and minus controls to transpose any piece instantly without navigating through menus, making it easy to find the perfect key for your voice, instrument, or practice session.
Live Key Updates
As you transpose, Chordio automatically displays the new key in real time, while the sheet music updates its key signature to match. This provides immediate visual feedback and ensures your notation always stays accurate.
Improved Key Detection
Sheet music now detects and displays the correct key more intelligently, resulting in cleaner, more readable notation with fewer unnecessary accidentals.
Faster Workflow
We've streamlined the interface to help you stay focused on making music. Simply tap anywhere on the sheet music to dismiss the volume controls and continue playing without interruption.
Guided Tour Refresh
The in-app guided tour has been updated to make it easier for new users to discover Chordio's features and get started more quickly.
Performance and Stability
We've made a range of performance improvements, interface refinements, and bug fixes throughout the app to deliver a smoother, more reliable experience.
Thank you for using Chordio. We're continually improving the app based on your feedback, and we'd love to hear what you think.
3.1.9 23 Jul
Introducing Harmony Explorer
A brand-new tool for understanding and building richer chord progressions, right from the Composition workspace.
Detected Scales: Instantly see which scales fit the chords already on your canvas, and click any match to set it as your song's key. Chord Suggestions: Browse chords organised by function, including Chords in Key, Borrowed Chords, Secondary Dominants, Tritone Substitutions and Cadences. Preview any chord, then add it to your progression with a single click. Relationship Colours: Turn on relationship colouring to see, at a glance, how every chord in your progression relates to the key, with colour-coded borders and Roman numeral badges for diatonic, borrowed, secondary dominant, tritone substitution and chromatic chords. Flexible Key Selection: Explore any major or minor key using the built-in key picker, follow the key of whichever chord you select, or automatically match your song's key signature. On Mac, Harmony Explorer opens in its own resizable window, so you can keep it open alongside your composition.
Faster Chord Editing
Right-click any chord cell to change its quality or extension on the fly, choosing from Major, Minor, Dominant and Suspended chord families without rebuilding the chord from scratch.
3.1.8 13 Jul
This update brings powerful new ways to play, capture and explore your chords.
Musical Typing Play notes directly from your computer keyboard – no MIDI device required. Simply press Command-K to open the Musical Typing panel, then use the letter keys to perform, with handy controls for octave, velocity, pitch bend and sustain.
Hold Last Chord Pin the last chord you played so it stays on screen with its notes highlighted on the keyboard. It's perfect for studying voicings hands-free. Use the arrows to scroll back through your recently played chords, and clear the memory whenever you're ready to start afresh.
Note Intervals on the Stave Tap any note on the stave to highlight it, hear it and instantly see the interval within the chord. It's a simple way to understand how each chord is built.
Refinements and Fixes We've also improved overall stability and polished the experience throughout the app.
We'd love to hear your feedback. Thanks for using Chordio.
3.1.7 4 Jul
This update makes building chord progressions in the Composition workspace faster, more intuitive, and more reliable.
Drag chords exactly where you want them You can now drag the Chord Display into any position in your progression, not just the end. A clear insertion guide shows precisely where your chord will land, and the new chord gently animates into place so the change is easy to follow.
Drag Chord Repeats into place Start and End Repeat signs now support the same drag and drop experience. Hover over a repeat sign to see that it is ready to be dragged, then drop it anywhere in your progression.
Refinements and fixes
Resolved a crash that could occur when editing your progression during playback. Fixed a display issue where a newly added item could briefly appear incorrectly. Polished animations and visual feedback throughout the Composition workspace.
Thank you for using Chordio. We would love to hear your feedback.
3.1.6 2 Jul
Compose directly on the staff, the Composition workspace is now fully interactive:
• Tap to add notes, drag them up or down to change pitch, and double-tap to delete.
• A subtle guide note follows your pointer so you always know where the next note will land.
• Move notes with the ↑/↓ arrow keys or transpose with a tap, the staff, chord name, and keyboard update together in real time.
Smarter chords:
• Tap a chord from your progression and extend it by adding notes right on the staff.
• Transposing a selected chord now updates the chord cell, staff, and keyboard all at once.
• Hold Last Chord lets you add extra notes to a sustained chord.
Built for the way you play (macOS):
• The detachable Grand Staff and Keyboard windows are fully interactive and stay perfectly in sync with the main window, including matching note highlights.
• Hold a chord on your hardware MIDI keyboard (with the keys or your sustain pedal) and tap to add more notes to it.
Stability & polish:
• Fixed extra app windows reopening after quitting.
• Resolved several crashes and improved overall reliability.
Thanks for using Chordio, we'd love to hear your feedback!
3.1.5 27 Jun
This update brings a more flexible workspace and powerful new tools for exploring harmony directly on the staff.
Resizable On-Screen Keyboard Drag the top edge of the on-screen keyboard to set the perfect height for your screen and playing style. Simply grab the handle and slide. Available on both iPad and Mac.
Interval Analysis on the Staff In the Composition workspace, tap two or more notes on the staff to instantly see the musical intervals between them—m3, M3, P5, and more—displayed beautifully beside the notes. A great way to learn and visualise how chords are built.
Personalise Your Colours New colour options in Settings let you choose your own colours for selected notes and interval labels, making the staff truly yours.
Plus a range of refinements and polish throughout.
3.1.4 25 Jun
This update introduces powerful new practice tools and enhancements to the Sheet Music workspace.
• Wait Mode: Practise at your own pace. The score now waits for you to play the correct notes before moving on, helping you master each passage step by step. Play along using your device's keyboard or a connected MIDI or Bluetooth piano, with clear on-screen guidance showing exactly what to play next.
• Built-in Metronome: Keep perfect time with an accurate metronome that stays synchronised with the music, even when looping a section. Turn it on or off at any time, and adjust the click volume, downbeat accent and count-in to suit your practice.
• Clearer Notation: Notes that extend across bar lines are now displayed with proper ties, so the sheet music reads exactly as intended.
• Performance and Stability: Enjoy smoother, more reliable playback along with a range of behind-the-scenes improvements.
We'd love to hear what you think. Your feedback helps shape Chordio.
This update makes exploring your sheet music more interactive, intuitive and enjoyable than ever.
• Tap to Hear Any Note or Chord: Tap a chord to hear it in isolation from the melody, making it easier to study harmony note by note.
• Notes Highlight During Playback: Notes now remain highlighted on the stave for their full duration, making it easier to follow what you're hearing.
• Keyboard Navigation: Use the arrow keys to move through the score. Left and right arrows step through notes one at a time and play each note, while up and down arrows switch between the treble and bass clefs.
• Piano Key Highlights: The on-screen piano now highlights the same notes shown on the stave, helping connect what you read with what you play.
• Improved Horizontal Scrolling: Refined layout and a cleaner background give the horizontal view a clearer, more focused appearance.
Thank you for using Chordio. We're always improving, and we'd love to hear your feedback and ideas.
3.1.3 23 Jun
Multiple MIDI Keyboard Support
You can now connect and play multiple MIDI input devices simultaneously. Enable any combination of keyboards, controllers, and virtual sources in Settings → Input MIDI Devices, ideal for layered setups, dual-keyboard rigs, or teaching with more than one instrument. Newly connected devices are detected automatically.
Hold Last Chord
Chordio can now keep your last played chord visible even after you release the keys, showing the chord name, notation, and highlighted keys without requiring a sustain pedal. The display remains until you play the next chord, making it ideal for learning voicings, teaching, and transcription. Enable it in Appearance settings, or quickly toggle it via right-click (Mac) / long-press (iPad) on the on-screen pedal.
Improvements
Various refinements and performance improvements throughout the app.
3.1.2 9 Jun
• Pedal-aware key highlights: Press your hardware sustain pedal and the highlighted notes on the keyboard now gently dim to confirm the pedal is engaged. The highlights return to full strength the moment you release. Toggle the effect on or off and fine-tune the dimming amount, from Subtle to Strong, in Settings › Keyboard › Sustain Pedal.
• Dots on highlighted keys: A new Settings toggle adds a soft dot to every highlighted note for at-a-glance chord reading, ideal for screenshots, presentations, or simply reading from a distance. The dots scale automatically to match any keyboard size, from compact to full 88-key layouts. Enable it under Settings › Keyboard › Show dots on highlighted keys.
• Chord Progression Grid built-in guide: Tap the new "?" button in the top-left of the Chord Progression Grid for a quick, clear explanation of what the view does, what each control (Keys, Start, Size) changes, and a reminder that you can tap any chord card to hear it played.
• Thanks for the continued feedback. It shapes every update.
3.1.1 19 May
We’ve made improvements to the Scales and Sheet Music workspaces, along with a smoother Composition experience.
Scales Workspace
* Added a new “Degrees” option in the Keyboard Fingering panel, view scale degrees (above the keyboard, aligned with the staff.
* The segmented control now determines what’s displayed above the keyboard:
* Notes shows letter names
* Left/Right Hand shows fingering numbers
* Degrees shows scale degrees
* Fingering numbers now correctly reflect the octave being played (e.g. the 5th finger appears on the octave note).
Composition Workspace
* Capture Mode now records the chord exactly as displayed (e.g. C/G), matching both what you see and what tapping the chord name captures.
Sheet Music
* Print / Save as PDF now exports the entire piece — the final system is no longer clipped at the bottom of the page.
* The piece description view (info button) now includes A+ / A− controls in the navigation bar, with an expanded font size range for improved readability.
Plus additional bug fixes and performance improvements.
Thanks for using Chordio — your feedback keeps us improving!
3.1.0 15 Apr
Notation System Selector — Teach and learn in your language!
Chordio now supports 6 musical notation systems, making it the perfect tool for music teachers and students worldwide:
- English (C D E F G A B)
- Solfege (Do Re Mi Fa Sol La Si)
- German (C D E F G A H)
- French (Ut Re Mi Fa Sol La Si)
- Chinese Numbered / Jianpu (1 2 3 4 5 6 7)
- Japanese Iroha (Ha Ni Ho He To I Ro)
Every note name, chord name, interval, scale, and mode across the entire app updates dynamically when you switch notation. This includes the keyboard labels, staff display, chord display,
circle of fifths, chord theory cells, progression generator, chord types, chord voicings, scale and mode workspaces, and transpose features.
German notation uses standard conventions: H for B natural, B for B-flat, abbreviated chord qualities (m/M), and localized interval names (gr. Sekunde, kl. Terz, etc.).
Solfege includes chromatic names (Di, Ri, Fi, Si, Li) with an option for localized Spanish/Italian interval names (Quinta Justa, Tercera Mayor, etc.) and translated mode names (Jonico,
Dorico, Frigio, etc.).
Find the new setting under Settings > Appearance > Notation Type.
Additional improvements:
- Fixed compiler warnings
- Improved circle of fifths stability when switching apps on macOS
- Improved chord display formatting for multi-character root names
3.0.9 27 Mar
• Improved PDF lead sheets for better print quality
• Bug fixes and performance improvements
3.0.8 23 Mar
• Fixed layout issues with the Chord progression lead sheets
• Bug fixes and performance enhancements
3.0.7 10 Mar
• Improved detection of MIDI input devices
• General performance enhancements and bug fixes.
We Value Your Feedback
Enjoying Chordio? Your feedback helps us make it even better.
Learn more at chordio.co.uk.
3.0.6 14/12/2025
• General performance enhancements and bug fixes.
We Value Your Feedback
Enjoying Chordio? Your feedback helps us make it even better.
Learn more at chordio.co.uk.
3.0.5 27/10/2025
Chord Charts
• View your progressions in a clear grid with piano snapshots for every chord.
• Print high-quality Piano Chord Charts to enhance your practice.
Visual Chord Learning
• Learn shapes and fingerings with clear keyboard visuals.
Music Theory Quiz
• Now includes four quizzes:
• Note Identification
• Interval Recognition
• Chord Matching
• Chord Playback Recognition
• Performance improvements and optimisations.
We Value Your Feedback
Loving Chordio? Your feedback helps us keep improving.
For more information, visit chordio.co.uk.
3.0.4 13/10/2025
What’s New
• Added 3 Music Theory Quizzes: Note Identification, Interval Recognition & Chord Identification
• Sheet Music Workspace now includes a count-in feature
• General improvements and optimisations
We Value Your Feedback
Are you enjoying Chordio? Your input helps us make the app even better.
For more info, visit chordio.co.uk.
3.0.3 07/10/2025
• Improved Performance - Implemented various bug fixes and performance improvements.
• Added more amazing content to the chord and sheet music packs.
Are you enjoying the app? We'd love to hear from you! Your feedback is invaluable and helps us improve Chordio. For more information, visit chordio.co.uk.
3.0.2 23/09/2025
• Improved Performance - Implemented various bug fixes and performance improvements.
• Added more amazing content to the chord and sheet music packs.
Are you enjoying the app? We'd love to hear from you! Your feedback is invaluable and helps us improve Chordio. For more information, visit chordio.co.uk.
3.0.1 08/07/2025
• Improved Performance - Implemented various bug fixes and performance improvements.
Are you enjoying the app? We'd love to hear from you! Your feedback is invaluable and helps us improve Chordio. For more information, visit chordio.co.uk.
3.0.0 04/06/2025
• Improved Performance - Implemented various bug fixes and performance improvements.
Are you enjoying the app? We'd love to hear from you! Your feedback is invaluable and helps us improve Chordio. For more information, visit chordio.co.uk.
2.9.9 04/05/2025
Chordio - What's New in This Version - 3.2.3 This update focuses on polish across your settings screens, plus a couple of nice visual touches.
• Redesigned the Keyboard Highlight colour picker with a curated palette, an opacity slider, and a live preview, with one tap through to the full colour picker whenever you want a custom shade.
• Fixed an issue where Sound, Keyboard, and Appearance settings could occasionally show the wrong value on a row after navigating back to that screen.
• Fixed overlapping footer text in Sound settings on certain window sizes.
• The Tools menu now shows at a glance when Harmony Explorer's relationship colouring is turned on, so you always know which view you're looking at.
Thanks for using Chordio. We're always refining the details, so keep the feedback coming.
more Version 3.2.3 3 days ago
Data Not Collected The developer does not collect any data from this app.