A curated BJJ technique ontology
Techniques, positions, concepts, and systems are modeled as named knowledge nodes, connected by typed relationships that explain how jiu-jitsu actually chains under resistance.
273 techniques, positions & concepts — 443 typed relationships
The knowledge graph for Brazilian Jiu-Jitsu.
A curated map of BJJ techniques and how they connect, a public record of athletes and matches, and an iOS training journal for what you actually hit under live resistance.
- 273
- Knowledge nodes
- 443
- Typed relationships
- 12,951
- Athletes
- 14,070
- Matches
One system: ontology, record, journal.
A public jiu-jitsu athlete & match database
The web reference curates BJJ athletes, competition matches, events, and organizations — connecting people, competition history, and technical structure over time.
A training journal app for live rolling
The iOS app is built for fast live logging: what you hit, missed, conceded, or need to revisit — a knowledge journal, not a workout tracker.
Ontology first
Jiu-jitsu techniques, connected — not listed.
Brazilian Jiu-Jitsu is not a flat list of moves. Every node in the graph — technique, position, concept, or system — is linked by typed edges that explain why it matters: variants, prerequisites, counters, starting positions, and follow-ups.
Open the interactive graph- is_variant_ofVariant Of
- is_part_ofPart Of
- starts_fromStarts From
- ends_inEnds In
- sets_upSets Up
- countersCounters
- requiresRequires
- opposite_perspective_ofOpposite Perspective
- related_toRelated To
Reference corpus
A public reference for BJJ athletes, matches, and events.
Every record is curated and source-linked, and the corpus is the foundation for richer athlete profiles, study cards, and expert signals as the project grows.
Built for the gym
A jiu-jitsu training journal built for the mats.
The iOS app tracks discrete live events against resisting partners and attaches them to knowledge nodes — giving you a memory of your game and the graph enough signal to show what is active, slipping, or missing.
- Log what you hit, missed, or conceded against live resistance
- “My Game” tracks your active repertoire and decaying techniques
- Offline-ready logging for poor gym Wi-Fi
- Knowledge events, not workouts — no cardio or volume tracking
How it works
How the ontology works.
- 01
Everything useful gets a name
Techniques, positions, concepts, and systems become knowledge nodes — separating loggable actions from the ideas that explain them.
- 02
Typed edges explain the connections
Nodes link through relationships like is_variant_of, counters, requires, and sets_up — capturing why one technique matters to another.
- 03
Your training attaches to the graph
Every logged event lands on a node, so your journal accumulates into a live map of what is working, slipping, or missing from your game.
Frequently asked questions.
What is a BJJ knowledge graph?
A knowledge graph models Brazilian Jiu-Jitsu as named nodes — techniques, positions, concepts, and systems — connected by typed relationships such as variants, counters, prerequisites, and setups. Instead of a flat list of moves, you get a map of how jiu-jitsu actually chains together under live resistance.
Is Jiu-Jitsu Reference free?
Yes. The web reference — the knowledge graph, athlete database, matches, and events — is free to browse, and the iOS training journal app is a free download on the App Store.
Is the mobile app a workout tracker?
No. The app logs discrete knowledge events from live training — techniques you hit, missed, or conceded against resisting partners — not cardio, session volume, or exercise sets. It is a training knowledge journal, not a fitness tracker.
Does the app work offline?
Yes. Log creation is offline-ready, so you can record events on poor gym Wi-Fi or with no connection at all and sync later.
Where does the athlete and match data come from?
The reference corpus is curated from public sources and source-linked, covering BJJ athletes, competition matches, events, and organizations, and it is reviewed as the project grows.
Is there an Android app?
Not yet. The training journal is currently iOS-only, while the full knowledge graph and athlete reference are available to everyone on the web.
Start mapping your jiu-jitsu.
Explore the public knowledge graph and athlete reference, then take the training journal to the mats.