# Chordio: compose & learn music — A companion tool for musicians > Interactive music composition and theory tool for creating chord progressions and learning music. (iPhone/iPad app by One In A Billion Ltd.) - Source: https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821 (this page in markdown: same URL + `.md`) - Developer: [One In A Billion Ltd](https://appshunter.io/developer/479881389) - Category: Music, Education - Price: Free with in-app purchases - Rating: 4.40/5 from 8 App Store ratings · 38 written reviews indexed - Age rating: 4+ - Requires: iOS 16.6 · 199 MB - Languages: American English - Released: 2022-08-04 - Data updated: 2026-09-02 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821/reviews.md ## What is Chordio? 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! ## Key features - Chord progression generator - Custom chord creation and editing - Real-time MIDI input visualization - Scales and modes practice - Music theory lessons and quizzes - Sheet music practice tools - Chord Suggestion AI ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Free Chord Pack | Free | one-time | | II-V-I Jazz Progressions | $9.99 | one-time | | Jazz Progression, Vol. 1 | $9.99 | one-time | | Jazz Lick Exercises, Vol. 1 | $9.99 | one-time | | Jazz Progressions 01 | $5.99 | one-time | | Neo-Soul Progressions 01 | $5.99 | one-time | | Neo-Soul Tunes 01 | $5.99 | one-time | | RnB Chords No.1 | $5.99 | one-time | | Classical Progressions 1 | $5.99 | one-time | | II-V-I Progression | $5.99 | one-time | | RnB Progressions 01 | $5.99 | one-time | | Beginner Essentials | $6.99 | one-time | | Classical Collection, Vol. 1 | $14.99 | one-time | | RnB Progressions, Vol. 1 | $7.99 | one-time | | Unlock App | $14.99 | one-time | | Chord Progressions 251 No.1 | $2.99 | one-time | | Gymnopedie No.1 | $1.99 | one-time | | Arabesque No.1 | $1.99 | one-time | | Gnossienne No.1 | $1.99 | one-time | ## Recent user reviews (10 of 38) All indexed reviews: https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821/reviews.md ### 5/5 — Best of its kind *2026-07-03* Chordio is by far the best app of its kind. I use it every day in the studio as a writing tool for work. The creator is also super friendly and passionate and continuing to make it even better. 6/5 stars! ### 5/5 — UPDATE *2026-06-26, version 3.1.4* Thanks for the update. I haven't explored it fully yet, but the addition of the hold button alone is a fantastic improvement to Chordio. I have complex software like Synfire/Scaler for theory, but this little app is very usable, and I use it much more than the complex software. It's just so easy to use, has a great interface, chord recognition and much more. ### 1/5 — Constant interruption *2026-04-19, version 3.1.0* What's the point of offering free features if an "upgrade to premium" prompt CONSTANTLY cuts the audio, the MIDI input and interrupts the flow? I can't experience what the app has to offer for more than a minute at a time. I can't record chords ideas because of this. Bad pushy design. ### 5/5 — Chordio is the app I’ve been looking for ! *2026-02-26, version 3.0.6* What a great app with such a useful set of tools for learning. Connecting to a DAW is so simple too. It also has a good piano sounds but I like going through Ableton live to use my piano of choice while working in Chordio. ### 4/5 — Great but not for Germans ;) *2026-02-17, version 3.0.6* Great program, all I ever wanted to show my students keys, scales and chords. But I’m missing a setting for German note names. I read “H” but hear “B,” and I read “Bb” but hear “B.” A solfège setting (e.g., for France or Italy) is also missing. With these features, it would be an instant buy for me. Unfortunately I can’t use it in class this way. ### 1/5 — It would be nice if you don’t ask me to pay every 2 minutes *2026-02-07* . ### 2/5 — Generally Ok, button big disadvantage *2026-01-22, version 3.0.6* Generally this app would be a good tool and it has a lot of helpful skills. But: The virtual keyboard has some major bugs which makes the app nearly unusable. Even the standard 88 key keyboard starts with with a G# in bass. That is definitive wrong. But the main bug is the 61 key onscreen keyboard. A regular 61 keyboard starts with C in Bass and ends with C in Treble. The Chordio Keyboard starts with F (only half on screen), the first whole key shown in Bass is F#. On Treble side it ends with B. A real 61 Keyboard ends with C. The chordio images in the App Store don’t show the keyboard layout what the real app does. Store I reported this bug, but unfortunately the developers seem not to be interested in fixing this. Because of this I rate the app with poor 2 stars. Otherwise I would rate it with 5 stars. ### 1/5 — Non stop bothering for a £15 purchase *2025-08-08, version 3.0.1* If the developer wanted to charge a reasonable price I might consider buying but for now the free version is unusable because of non stop persevering for purchases ### 5/5 — Can’t access my purchase *2025-07-17* Hi today I bought the premium upgrade and I also purchased all 7 chords packs but their no way to restored my purchase and also I bought the Rnb sheet music I still can’t access my purchase or even restor my purchase please help after all I would recommend this amazing app but need some bug fix. ### 1/5 — Doesn't work *2025-07-12, version 3.0.1* Adding chords just doesn't work. Connected to my Ymaha keyboard through midi - that works. However, the dragged a chord name to the composition area doesn't work. Pity. ## Frequently asked questions about Chordio ### What does Chordio do? Chordio is a music composition and theory tool designed to help musicians explore chords and scales, create chord progressions, and learn music theory. It offers an interactive experience for discovering new musical ideas and storing your compositions. ### What are the key features of Chordio? Key features include a built-in sequencer and chord progression generator, custom chord editing, real-time MIDI visualization on a Grand Staff, scale and mode practice tools, music theory lessons and quizzes, and sheet music practice functionalities like tempo adjustment and looping. ### How much does Chordio cost? The application is free to download and use, offering a range of features. However, it also includes in-app purchases, suggesting that some advanced features or content might require additional payment. ### What are the use cases for Chordio? Chordio can be used to spark creativity for new songs, learn and practice music theory concepts, experiment with different chord progressions and scales, and even practice playing songs with sheet music tools. It's beneficial for songwriting, music education, and general musical exploration. ### Is Chordio compatible with external hardware? Yes, Chordio can connect to your MIDI controller. When connected, it displays chord names on the Grand Staff in real-time as you play, allowing for a more interactive and immediate composition experience. ## Version history (last 5 releases) ### 3.2.3 — 2026-08-29 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. ### 3.2.2 — 2026-08-19 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. ### 3.2.1 — 2026-08-11 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. ### 3.2.0 — 2026-07-28 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. ### 3.1.9 — 2026-07-23 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. ## Apps similar to Chordio | App | Rating | Price | Category | | --- | --- | --- | --- | | [Piano Chords Master](https://appshunter.io/ios/app/piano-chords-master/id1068547064) | 4.5 (66) | Free | Music | | [Chords Pad](https://appshunter.io/ios/app/chords-pad/id1462256877) | 4.8 (88) | Free | Music | | [Musicate](https://appshunter.io/ios/app/musicate/id1350149866) | 4.9 (227) | Free | Music | | [All Chords - All Scales](https://appshunter.io/ios/app/all-chords-all-scales/id1613557968) | 4.3 (6) | Free | Music | | [Suggester 2 : Chords & Scales](https://appshunter.io/ios/app/suggester-2-chords-and-scales/id6448964737) | 4.6 (362) | Free | Music | | [Pianoteq 8](https://appshunter.io/ios/app/pianoteq-8/id1642344241) | 4.6 (133) | Free | Music | ## More apps by One In A Billion Ltd - [Chart Music](https://appshunter.io/ios/app/chart-music/id479881186) - [Sonosync - Relaxing music](https://appshunter.io/ios/app/sonosync-relaxing-music/id990197299) - [Writers Session](https://appshunter.io/ios/app/writers-session/id1172558973) - [Chordio+: create & learn music](https://appshunter.io/ios/app/chordio-plus-create-and-learn-music/id1662210145) - [Writers Session Pro](https://appshunter.io/ios/app/writers-session-pro/id6756976450) All apps by One In A Billion Ltd: https://appshunter.io/developer/479881389 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-02.*