Onlyoss is the app for martial arts schools, coaches and the people who train with them. Your rank, your school and your check-in, in one place.

YOUR RANK, CONFIRMED BY YOUR COACH
Keep your belt and rank on your own page: BJJ belts and stripes, karate and judo kyu and dan, aikido, Muay Thai, kickboxing and more. A rank you add yourself is shown as self-declared. When your school confirms it, it turns gold with the school's name, so anyone can see it is real. It works as a belt tracker for every martial art you train, with your main rank first and your other arts below.

YOUR SCHOOL'S OWN PAGE
Find your gym, dojo or academy among martial arts schools from 65 countries. Each school page shows its ranks, its Google reviews, where it is and a button to book a free class. Follow the schools and coaches you like.

CHECK IN WITH A TAP
At the door, open the app and tap Check in: the camera reads the school's QR code and your class attendance is recorded. Long-press the Onlyoss icon for "Scan to check in" straight from your home screen. Only an Onlyoss school's own check-in code is accepted.

FOR COACHES AND PERSONAL TRAINERS
Get a coach page people book from, with your photo, your rank, the arts you teach and a Book a session button. Share it with a link or a QR code. Your students are on one list, and you confirm their belts yourself.

FOR GYMS AND ACADEMIES
Run the school day to day: member list, ranks you confirm, QR attendance at the door, a list of who has not come in two weeks with a message ready for each name, sign-ups for a free class, and ready-made posts for your social media. Onlyoss works for martial arts academies, boxing gyms, MMA gyms, wrestling clubs, CrossFit boxes, fitness gyms and personal trainers.

ON YOUR PHONE
- Notifications for what matters: a new enquiry, a rank waiting for you, a rank confirmed.
- Your card, even offline: when there is no internet, the app still shows your name and your last-seen rank.
- Messages with your school, your coach and other athletes.
- Your page in English or Brazilian Portuguese.

WHO IT IS FOR
Jiu-jitsu (BJJ) and grappling, MMA, boxing, kickboxing, Muay Thai, wrestling, judo, karate, aikido, taekwondo and every other martial art; the coaches who teach them; and the gyms, CrossFit boxes, fitness studios and academies where people train.

Onlyoss is made for adults (18+). Create your free account in the app or at onlyoss.com.

Privacy policy: https://onlyoss.com/pages/privacy
Delete your account: https://onlyoss.com/delete-account
Questions: support@onlyoss.com