Chordii — App
Every chord, every key — more than all our physical products, in one app. One purchase. No subscriptions, no ads.
- All 24 keys, laid out on the circle of fifths
- Every chord in every key — notes, what it's doing, flavor extensions, and substitutions
- Borrowed chords from outside the key, clearly marked
- Progressions browsable by mood, in major or minor, any key
- A progression builder with up to 8 slots and guided suggestions for where to go next
- Four tools for when you're playing: Capo, Transpose, Turnarounds, Parallel Minor
- The complete Chordii system — more than the physical products combined
Chordii is a web app, not an App Store download — you install it straight from your browser, no store required.
After you purchase, go to app.chordii.com on your phone, add it to your home screen, and open it. Sign in with the email you used at checkout and we'll send you a 6-digit code. Enter it once and you're in.
One purchase, one account. You'll get a welcome email with the full setup steps right after you buy.
- Works on iPhone and Android
- Runs in any modern browser
- Installs to your home screen like a normal app
- Works offline once installed — no connection needed to use it
- Nothing to download from the App Store or Play Store
One-time purchase. Buy it once and it's yours.
No subscription. No ads. Nothing inside the app is ever for sale. No recurring charges, now or later.
The whole system, in one place.
Chordii started as a set of chord-reference cards built around the circle of fifths. The app is all of it — and then more than all of it. Every key, every chord, every substitution, every progression, in your pocket. If you own the cards, this is their companion. If you don't, it's everything on its own.
(psst, watch the video)
Pick a key. See everything.
Start with the full key in front of you: every chord around the circle of fifths, light for major, dark for minor. Change key with a drag — the grid shifts and settles like the original wheel. Everything in one view, waiting to be tapped when you're ready to go deeper.
Tap a chord, understand a chord.
Every chord opens up: its notes, what it's doing in the key, the extensions that change its color, and substitutions when you want a different feeling — including borrowed chords from outside the key, clearly marked. Less "here's the theory," more "here's how it feels."
Find a progression by how it should feel.
Browse curated progressions by mood — uplifting, melancholic, brooding, epic — in major or minor, in any key. When you'd rather write your own, the builder gives you up to eight slots and suggests where to go next as you fill it in.
Four tools for when you're actually playing
Capo, Transpose, Turnarounds, and Parallel Minor — the practical lookups you need mid-session, each one a quick reference, no digging.
Yours. No strings.
This is the part I care about most. I'm tired of renting software. Tired of ads. Tired of opening an app to make something and getting sold something instead. Chordii doesn't do any of it. Buy it once and it's yours. No subscription, no ads — ever. Nothing inside it will ever try to sell you anything.
Install it to your home screen, sign in once, and it works offline. Nothing in your way. Just you and the chords.
Frequently Asked Questions
Once you order, the app is yours no matter the device — install it on your iPhone, your iPad, all of them. Your purchase is tied to your email, and each time you sign in on a new device you'll get a fresh 6-digit code. One $15 purchase, all your devices, yours to keep.
Yes — it works on all Apple iPhones and iPads. Just keep in mind this first version is built for portrait mode. The next thing on my schedule is a whole new layout built specifically for the iPad in landscape mode. Purchase now and that (plus any other new feature) will be included free and updated automatically for you.
Here are the steps:
- Open the app in the Safari browser.
- After logging in, tap the 3 dots on the bottom menu.
- Tap 'Share'.
- Tap 'View More'.
- Tap 'Add to Home Screen'.
That'll install the app right on your phone.
Not yet, but that's scheduled to be added next. When it goes live, you'll get the update for free, automatically.
Not yet, but guitar chord diagrams are on our development list for when we have the time and budget. Everyone who owns the app will automatically receive that upgrade for free when it's ready.