Meet Chordii - a revolutionary music theory tool made by musicians, for musicians.

Simplify Key Changes

  • Instantly find the right chords in any key
  • Say goodbye to capo confusion and awkward transposing
  • Stay in the moment when the key changes mid-set

Teach the Number System

  • Make the Nashville Number System actually make sense
  • Show your team how chords connect—not just what to play
  • From “Wait, what?” to “I’ve got this” in one spin

Build Confident Musicians

  • Help your team understand the why, not just the what
  • Turn hesitant players into bold leaders
  • Confidence sounds like worship, not worry

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 (kor-dee) is music theory minus the headaches. Find your key, your chords, and your flow — fast. No screens. No endless Googling. Just a hands-on guide to keep you locked into the music you’re called to make.
 

"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 SteortsDPhil, President - Visible Music College

"Chordii is an easy approach to progressions that will save you time and boost your creativity. Whether you're a seasoned composer or just getting started, Chordii is a game-changer!"

Watch Chordii Podcast
Dave Kropf52 Cues

"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 WhittenLead Guitarist, Grave Robber

"Chordii has been an extremely valuable tool for quick changing song keys, finding notes in the chord and the chord progression ideas on the back make for endless musical fun and jamming ideas. It’s a great learning tool and resource!"
Brian PorterPorter Pickups

Questions? We've got you covered.

Chordii brings music theory to life — no screens, no distractions. Spin to your key, and instantly see the chords and progressions you can play. It's simple, fast, and made to spark creativity. For more, check out our instruction page!

No — and that's the beauty of it. Chordii unlocks the power of music theory in a way that feels natural, not technical, helping you create with confidence at any stage.

Music theory helps you understand how notes and chords work together, like learning the rules of a new language. But it can get pretty complicated — there are a lot of rules about which notes and chords go together, and what emotions they create. Even musicians who study this stuff for years can get lost in the details.

That’s where this tool comes in. Think of it as your cheat sheet for music. You just spin the wheel to pick a key, and it shows you:

  • The notes in that key (like the ingredients for your song).
  • The chords that work with those notes, and whether they’re happy, sad, or tense.
  • How everything fits together, so you can make melodies and harmonies easily.
  • The "relative minor" key, which helps you change the mood without changing the notes.
  • Plus, there are 15 chord progressions with moods already described, so you can try them out and spark new song ideas.

This tool takes the guesswork out of music theory so you can focus on what matters most — making music! Whether you’re just getting started or need fresh ideas, it’s like having a music coach right 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.

Definitely! Discounts kick in automatically at checkout when you order 5, 10, 20, or 30+ items. No special codes needed — just add to your cart and save!

We ship anywhere in the United States via USPS. For international orders, we use trusted carriers like UPS and DHL to ensure fast and reliable delivery.

Shipping times vary by destination, but you'll see an estimated delivery date when you choose your shipping options at checkout. Once your order is placed, we’ll get to work and have it shipped out within 1-2 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" combines simplicity and musical relevance with a modern twist. The name highlights the focus on chords, and the subtle nod to the Roman numeral "ii" adds depth for advanced users. For Andrew, the founder, the number two holds personal meaning: it represents his second chance after overcoming stage 2 cancer, having 2 kids, and creating Chordii as his second shot at his "Theo" design, which he sold to cover medical bills.

Yes, we do! If you’re interested in becoming an affiliate, simply shoot us an email (andrew@chordii.com) and we’ll get you set up. Our mission is to help others grow, and we’d love to support you in making money doing what you’re passionate about. We're always excited to partner with like-minded individuals!

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