Alternatives to music21

ChordIQ

ChordIQ suits beginners learning staff notes and intermediate musicians working on theory and ear skills.

Complete Rhythm Trainer

The app suits learners practicing rhythm notation and performance from introductory to advanced material.

Complete Music Trainer

It suits learners who want structured exercises in listening, rhythm, and reading music across web or desktop.

note-noodle

note-noodle suits musicians who want structured theory practice across notation, fretboard, rhythm, and ear training.

Musition

Musition suits students learning music theory and teachers who need to create assessments and track student results.

Musicca suits students, educators, and musicians practicing music theory at school or at home.

Contrapunctus suits music students, composers, and educators seeking browser-based theory and counterpoint tools.

It suits aspiring musicians and songwriters who want interactive theory lessons, harmony tools, composition exercises, and progress tracking in a browser.

It suits band and choir students, self-taught guitarists and producers, returning adult learners, and people preparing for theory placements or exams.

MusicTheory.net

It suits learners studying music theory and teachers who want linked exercises or verification codes for student work.

It suits learners who want structured music theory and sight-reading practice, including people preparing for ABRSM Levels 1–5.

Study Music Theory

It suits musicians learning theory or ear training, including piano and guitar learners, singers, producers, beginners, and people preparing for theory exams.

Teoria suits learners who want free theory lessons, ear training, practice exercises, and optional progress records across web and mobile devices.

uTheory

uTheory suits individual music learners, teachers, schools, and colleges needing browser-based lessons and practice.