Chord Builder
The Chord Builder is the harmonic center of the LandChords all-in-one songwriting workspace — write a progression in any key, hear it with real instrument samples, and keep it locked to the same song as your lyrics and vocal takes.
Start freeNo credit card · runs in your browser · desktop & mobile
Pick a key and time signature, then add chords by scale degree: I, IV, V, vi, ii, iii, vii°. Because everything is relative to the key, the same progression makes sense whether you are in C or F♯, and transposing is a single click.
Each chord is colour-coded by its degree, so you can see the harmony of a whole section at a glance instead of decoding a wall of chord symbols.
Play any chord or the whole progression back with sampled piano, acoustic guitar, electric bass, or ukulele. Set per-chord beats so the playback follows your actual rhythm, and loop a section while you experiment.
Diatonic suggestions show you which chords belong in the key, so you can stack a believable progression fast. Want tension? Drop in a borrowed chord and the colour coding makes the outside chord obvious.
Stuck on the next move? Ask for the next chord or a full progression in your key and genre, then tweak what comes back. Every plan includes a few AI chord suggestions a day, and Pro raises the daily limit.
Is the chord progression builder free?
Yes. You can build progressions, hear them with instrument samples, and save two songs on the free plan with no credit card. AI chord suggestions come with a small daily limit on free; Pro raises that limit and unlocks unlimited songs.
Do I need to install anything?
No. LandChords runs entirely in your browser on desktop and mobile. There is nothing to download or install.
Can I transpose a progression to another key?
Yes. Because chords are stored by Roman-numeral degree, transposing the whole song to any key is a single click.