Meet Chordii - a revolutionary music theory tool made by musicians, for musicians. Transform complex theory into intuitive movements, because creation should feel natural.

Effortless Transposition

  • Spin to any key instantly
  • See all related chords at a glance
  • No mental math required

Intuitive Learning

  • Perfect for visual learners
  • Natural progression discovery
  • Hands-on understanding

Screen-free Creation

  • Stay in your creative flow
  • Portable and durable design
  • Never needs charging

From Idea to Song in Four Steps

Start anywhere on the wheel. Whether you're matching a singer's range or finding your comfort zone, Chordii shows you every possibility at a glance.

Watch as Chordii reveals the perfect chord relationships for your key. No more guessing which chords work together—it's all right there in front of you.

Flip Chordii over to discover mood-based progressions that spark creativity. From melancholic to uplifting, find the perfect emotional foundation for your song.

With theory simplified, your creativity can flow freely. No screens, no apps, no distractions—just you and your music, exactly as it should be.

Chordii (pronounced kor-dee) transforms complex music theory into an intuitive experience. This elegantly crafted companion gives you instant access to scales, chords, and progressions — all in a screen-free, tactile format that keeps you focused on what matters: making music.
 

Effortlessly explore all 15 major scales with Chordii. Spin through every key to uncover scales, chords, and progressions with clarity and simplicity.

Turn it over to find mood-based chord progressions designed to ignite your creativity. Intuitive, inspiring, and easy to use – Chordii keeps your music moving forward.

Testimonials

This is the coolest music gizmo.
We are definitely solidifying our understanding of chord relationships.

Being able to check them out and gradually memorize progressions is also very helpful for getting comfortable playing traditional music jam sessions.

Thank you!
Marcia C.Customer

So impressed by the simplicity, the ease and level of detail. The back is such a helpful starting place for creating progressions and it’s crazy it’s so cheap. I’m sure there are apps out there but having something physical and easy to put in any case or backpack is wonderful and helps to stay distraction free.
Bobby B.Worship Guitarist

Chordii is a really useful resource for musicians. You'll want to add this to your toolkit!
Q.E.Pastor/Worship Leader

I just got my Chordii but it's an ingenius little device. I have had a ton of fun playing around with different chord progressions. I highly recommend it! Great job!!
Aaron S.Customer
Read All

"Chordii is a smart and creative tool that will help emerging artists and aspiring musicians alike in keeping their knowledge up with their skills and originality. I’ve pushed for this kind of theory knowledge for every musician for 30 years and not seen an easier way to have it at your fingertips. I especially enjoy the songwriting chord progression hints and help on this model with the ease of key changes built in. As a rare “never capo” player and songwriter, I think this way regularly and our students need to know and be reminded of this content.

Thanks to Chordii, they will have a smart, even elegant helper in the backpack or instrument case, and will be ready to go when situations call for collaboration and key changing improvisation."

Ken Steorts, DPhil
President
Visible Music College

“The chordii is a great tool for any chord based musician/songwriter! It lays out the basic chords in each major key clearly and provides some great progression suggestions to get your creativity flowing. I feel like this is a great tool for any one looking to invest in themselves or others. Teachers, Worship Leaders, Music Directors, Song Writers, pianist, guitarist, etc can all benefit from having the chordii close by.“

Andy Whitten
Lead Guitarist for Grave Robber

Transposing just got effortless.


Simply spin to any key and watch as Chordii instantly reveals every chord and note you need — putting music theory on autopilot. No mental math, no guesswork, no interruptions to your creative flow.


Ready to unlock endless musical possibilities?

FAQs

Chordii is a physical music theory tool that helps you discover chord progressions and scales through intuitive movement. Simply spin to your desired key, and Chordii instantly shows you compatible chords and progressions—no batteries or screens required.

Not at all! Chordii was designed for musicians of all levels. Whether you're just starting out or you're an experienced songwriter, Chordii makes music theory accessible and intuitive.

Music theory is like learning the rules of a new language—it tells you which notes and chords sound good together, how to create different emotions, and how to build songs step by step. But it can get really complicated. There are 15 different keys, each with its own set of notes and chords, and you have to remember which chords are happy (major), sad (minor), or tense (diminished). And, by the way, which notes make up each chord. Even people who study music for years can struggle to keep all of this straight.

That’s where this tool comes in. It’s like a cheat sheet for making music. You spin the wheel to pick a key, and it instantly shows you:

  1. The notes in the key – like the building blocks of your song.
  2. The chords you can use – and whether they’re major, minor, or diminished.
  3. How the notes and chords are connected – so you can easily create melodies and harmonies.
  4. The relative minor key – a way to shift the mood while using the same notes.

Plus, on the back, there are 15 ready-made chord progressions with descriptions of the moods they create, so you can try them out for songwriting inspiration.

This tool simplifies all the hard stuff, so you can focus on making music instead of getting stuck in the technical details. Whether you’re a beginner or just looking for fresh ideas, it’s like having a personal music coach in your hands!

Chordii is crafted from premium, 24pt cardstock with a soft-touch finish that's built to last. Its lightweight yet sturdy construction makes it perfect for taking to writing sessions, rehearsals, or lessons.

Absolutely! Shoot us a message at andrew@chordii.com and we'll hook you up!

We currently ship to all 50 United States. For international shipping inquiries, please contact us directly at andrew@chordii.com and we'll be happy to discuss options.

Orders typically ship within 1-2 business days. Standard delivery within the US takes 3-5 business days.

We offer a 30-day satisfaction guarantee. If you're not completely satisfied with your Chordii, return it in its original condition for a full refund, minus shipping costs.

Chordii requires minimal maintenance. Simply keep it clean and dry, and avoid exposing it to extreme temperatures or direct sunlight for prolonged periods.

"Chordii" is a strong and versatile name that combines simplicity, musical relevance, and a modern feel. It’s perfect for a music theory tool focused on chords, and the subtle reference to the Roman numeral ii adds a clever touch for more advanced users. Plus, the number two has personal meaning to the founder. Andrew had stage 2 cancer, has 2 kids, and Chordii is his 2nd chance at his "Theo" design that he sold to pay for medical bills.

Contact us at andrew@chordii.com and we'll get back to you within 24 hours.