Independent teachers
One teacher, a teaching room, and a steady stream of students. C3NTR puts your notation, harmony, analysis and history in one place. No second tool, no spreadsheet.
For music schools
A knowledge home for your music theory school.
Notation, harmony, analysis and the language of music
→ See a quick tour
Free for up to 30 students
No credit card
UK GDPR · EU (London)
Works offline
Your studio's teaching deserves a home
Theory gets taught at the end of a long week. Italian musical terms get used in passing and rarely defined. Harmony rules get introduced and forgotten between lessons. C3NTR is a quiet place to write it all down once, in your studio's voice.
Who this is for
Studios with multiple teachers
Two or more teachers sharing students or rotating cover. C3NTR holds the shared standard so every lesson draws from the same library.
Schools preparing for ABRSM Grade 5 and beyond
You're preparing students for ABRSM Grade 5 theory (a prerequisite for higher practical grades). Content locked by grade keeps newer students on basics while Grade 5 candidates see the full syllabus.
Built for teachers, not for IT
Your teacher opens the app, taps Edit, and writes the next harmony rule in plain prose. The next lesson, the student arrives knowing the rule.
Write directly in the app
Like a notepad. New articles are drafts until you publish, so nothing goes live by mistake.
Mobile-first authoring
Edit on the phone between classes or on the way home. The same library, the same edit screen.
A working library in under an hour
Import the starter template in a few taps. Edit anything that doesn't fit. Publish when ready.
ABRSM theory grades, Trinity theory grades
Content locked by grade, in your studio's progression
Tag any article with a minimum grade. Grade 1 sees notation and rhythm. Grade 5 sees harmony and analysis. Grade 8 sees full theory. The same library, the right view per student.
A glossary in Italian and English and English
Music theory carries its own vocabulary. C3NTR's glossary holds the terms in one place: the Italian and English names, your studio's translation, and the article each term appears in.
- Staff
- The staff is the set of five horizontal lines..
- Clef
- A clef is the symbol at the start of a line of music that fixes the names of the notes on the staff..
- The musical alphabet
- The musical alphabet is the seven letter names used for all notes..
- Note value
- A note value is the length of a note, how long its sound lasts..
- Rest
- A rest is a symbol for silence, a measured length of not playing..
- Time signature
- A time signature is the pair of numbers at the start of a piece that shows how the beats are grouped..
Exams, study sessions, group classes
C3NTR isn't only the library. Schedule theory exam dates, post when a group session is on, and let students see what's ahead. Announcements land on their Today tab and events sit on the calendar.
Start from our Music Theory template
A working starter with 15 articles, 2 short videos, a 17-terms glossary across 5 tags (Getting Started, Foundations, Practice, Progression, Resources). Import in a few taps, then edit anything that doesn't fit your school. Every article, term and tag is yours from the moment you import.
See the Music Theory template Template source:assets/templates/music/music_theory.c3t.md
Inside the app
A look at how the library, articles and grade controls feel in your students' hands.
Plays well with what you already have
Bring your existing theory notes and worked examples in with smart Word document import or paste Markdown directly from your studio's archive.
Word documents
Smart import reads headings and turns them into draft articles. You review before anything publishes.
Markdown from any editor
Notion exports, Obsidian notes, Bear, plain .md files. Paste or import.
C3NTR templates
Open .c3t.md format. Schools can share templates with each other without us in the middle.
UK GDPR · DPA 2018
UK GDPR compliant. Hosted in the EU (London).
C3NTR is built around UK data protection law from the ground up. Your school's data sits in the EU on Google Cloud London, the same region we manage from.
UK GDPR + Data Protection Act 2018
Built around UK GDPR Article 6 lawful bases. Subject access requests answered within one calendar month.
Hosted in the EU (London)
Your school's data sits on Google Cloud in the europe-west2 (London) region. No transfer outside the UK or EEA for core operation.
Encrypted in transit
All data is TLS encrypted. Access restricted to personnel with a clear business need.
Account deletion on request
Permanent deletion of personal data and content via in-app or written request.
What C3NTR is, and what it isn't
A library your school owns
Another booking or billing system
Built for how schools actually teach
A generic course builder
Calm, focused reading for students
A feed competing for attention
Start free. Move up when you outgrow it.
Seed
Free forever
Up to 30 students
All core features. No credit card.
Start freeSchool
£39/mo
£32/mo billed annually
Up to 150 students
Push notifications. 1 GB media storage.
Choose SchoolAcademy
£69/mo
£57/mo billed annually
Unlimited students
Multi-instructor publishing. Engagement analytics. 5 GB media storage.
Choose AcademyStudent? Show this to your teacher.
If you learn music theory and you'd love a quiet library you can return to between lessons, share this page with your teacher. Most studios start on the free Seed plan in under five minutes.
Common questions
Can students only see their grade's material?
Yes. Tag any article with a minimum grade. Beginners see only basics. Teachers and senior students always see everything.
Does it cover ABRSM theory, Trinity theory, Royal Schools?
Yes. The starter is exam-board neutral. ABRSM theory, Trinity theory, Royal Schools or your own progression can adapt the syllabus without rewriting.
Can my studio customise the music theory template?
Yes. Every article, exercise and term is editable. Add your studio's repertoire, your favoured method books and your house standards.
How long does it take to set up?
Most schools have a working library in under an hour. Import the starter template in a few taps, then edit anything that doesn't fit. Starting blank takes a little longer. Allow an hour or two to write your first ten articles. Students can use the app the day you publish.
Do I have to stop using my booking system?
No. C3NTR is a knowledge library for your curriculum, terminology and progressions. Booking, billing and scheduling stay with the tools you already use.
Is there a free plan?
Yes. Seed is free forever for up to 30 students, with no credit card required. Move up to School (£39/mo) or Academy (£69/mo) when you outgrow it.
Other music disciplines
Teach a different style? Tell us.
Whether it's a specific music theory lineage we don't list, or another discipline entirely, drop us a line and we'll add a starter template. In the meantime, the app already works for any structured curriculum, your library starts blank in a few minutes.
Ready to give your music theory students a knowledge home?
Free for the first 30 students. No credit card. A working library in under an hour.
Start free for your school