Skip to content

Checker Rules Assignment sets Pricing My exercises

Create an account

An account saves your exercises, lets you join a teacher's assignment set or create one, and unlocks AI explanations. The checker itself works without one.

EmailPassword

At least 12 characters. A short sentence works well.

Already have one? Sign in.

Check your inbox

If that address can be used, you're all set — and if it already has an account, we've emailed it a link to sign in instead.

hmmony — checks four-part harmony exercises for voice-leading errors.

Checker What it checks Pricing Report a problem or send feedback