Independent dojangs
One sabum, an assistant or two, and a steady stream of new students. C3NTR puts your kicks, poomsae and tenets in one place.
For martial arts schools
A knowledge home for your taekwondo dojang.
Kicks, poomsae, the five tenets and the language of the dojang.
→ See a quick tour
Free for up to 30 students
No credit card
UK GDPR · EU (London)
Works offline
Your dojang's curriculum deserves a home
Poomsae descriptions vary by instructor. Korean terminology gets re-explained on grading week. The five tenets sit on a poster nobody reads. C3NTR is a quiet place to write it all down once.
Who this is for
Schools with multiple instructors
Several sabums teaching across the week. C3NTR holds the shared standard so every class draws from the same library.
Federation-affiliated schools
World Taekwondo, ITF or another federation. Content locked by gup and dan keeps newer students safe while higher grades see the full syllabus.
Built for teachers, not for IT
Your sabum opens the app, taps Edit, and writes the next poomsae correction in plain prose. The next class, students arrive knowing the move.
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.
Gup and dan grades
Content locked by grade, in your dojang's gup and dan
Tag any article with a minimum gup or dan. White belts see basic kicks and the first poomsae. Higher grades see advanced kicks, tul and sparring tactics. Sabum sees everything.
A glossary in Korean and English
Every taekwondo dojang carries Korean terminology. C3NTR's glossary holds the terms in one place: the Korean, your dojang's translation, and the article each term appears in.
- Dojang
- The training hall (도장), the place where Taekwondo is practised. More than a gym, the dojang is a place of focus and respect, where the etiquette of the art is observed.
- Dobok
- The Taekwondo uniform (도복), a white jacket and trousers with a belt. Light and easy to move in, designed for the high kicks the art uses. The colour of the belt marks your grade.
- Kihap
- The spirit shout (기합), a sharp cry from the belly at the moment of a decisive technique..
- Poomsae
- A form (품새), a set sequence of techniques performed against imagined opponents..
- Tul
- A form (틀), the ITF name for a set sequence of techniques..
- Taegeuk
- The set of eight poomsae used in World Taekwondo for the geup grades (태극)..
Gradings, sparring nights, demonstrations
C3NTR isn't only the library. Schedule the next grading, post sparring nights, and tell the dojang when a demonstration is coming up. Announcements land on their Today tab and events sit on the calendar.
Start from our Taekwondo template
A working starter with 15 articles, 3 short videos, a 10-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 Taekwondo template Template source:assets/templates/martial_arts/taekwondo.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 poomsae notes and Korean terminology in with smart Word document import or paste Markdown directly from your dojang'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 sabum.
If you train at a taekwondo dojang and you'd love a quiet library between training, share this page with your sabum. Most schools 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 gup or dan. White belts see basics. Higher grades see the full syllabus. Sabum always sees everything.
Does it cover both WT and ITF styles?
Yes. The starter is style neutral. WT (Kukkiwon poomsae, electronic scoring sparring) and ITF (tul, full-contact sparring) schools can both adapt it without rewriting.
Can my school customise the taekwondo template?
Yes. Every article, poomsae and tag is editable. Add your federation's poomsae list, your grading syllabus and your own tenets.
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 martial arts disciplines
Teach a different style? Tell us.
Whether it's a specific taekwondo 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 taekwondo 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