The BJJ journal for people serious about getting better.

Five minutes a day. Talk about your training and get better effortlessly.

Start free How it works

Five Minutes

A small daily habit that keeps your progress moving between sessions.

9:41

100%

SubZero Journal

captures the pattern

I kept losing the underhook from half guard. What should I fix first?

Start with head position and your near-side elbow. Drill that first, then rep the knee shield recovery for five minutes before rounds.

Save to journal

Build a drill plan

Log by voice

9:41

100%

Athlete scorecard

updated this week

+12%

Top game84%

Escapes76%

Takedowns63%

Focus this week

Half guard framesSit-up sweepCrossface wins

For Serious Athletes

Serious training deserves a better system than memory.

Memory alone is not enough. You need a way to capture details, spot patterns, and show up with intention.

Built for jiu-jitsu

This is not a generic productivity app with a grappling skin on it. It is designed around classes, rolls, drills, and game planning.

Mobile-first by default

Use it right after class, between rounds, or on the drive home. Voice and chat are designed for the moments when training is still fresh.

Clear enough to actually use

Open the app, talk through what happened, and leave with something useful fast. No setup maze. No spreadsheet behavior.

Inside the app

Built for people serious about getting better.

Every part of the app is designed to help you capture the session, review the pattern, and improve with more intention between classes.

Log every session

Your training journal writes itself

Drop in a quick recap after class and the app turns it into clean, searchable training history.

Preview01

Tonight's class

Knee cut details, sit-up sweep timing, lost two rounds to guillotine pressure.

Journal entry generated and saved.

Session summaries

Technique notes

Searchable history

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Build carryover

Your progress compounds between sessions

SubZero keeps your goals, injuries, style, and recent rounds in view so your next step starts from reality, not from zero.

Preview02

What should I focus on tomorrow?

Revisit collar tie entries and recover inside position sooner from seated guard.

Uses your historyUpdates over time

Persistent training memory

Goal-aware prompts

Relevant context every time

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Know your game

See your strengths and blind spots

Generate a scorecard that maps where you're sharp, where you're leaking, and what deserves your next reps.

Preview03

Passing88%

Bottom game74%

Standup61%

Offense and defense

Top and bottom game

Focused next steps

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Build your system

Turn scattered notes into actual sequences

Flowcharts show your go-to chains so you can spot patterns, dead ends, and openings to expand.

Preview04

Guard pull

Shin-to-shin

Sit-up sweep

A-game mapping

Decision trees

Clear progression

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How it works

A simple system for serious athletes.

Five focused minutes after class can keep your progress moving between sessions without adding busywork.

Start free

Talk through your session

Type or speak what you drilled, what happened in live rounds, and what felt sharp or off.

Let the app organize it

Your notes become journal entries, remembered context, and structured insight without extra admin.

Show up with a clearer next step

Come back before the next class to review patterns, sharpen your focus, and train with more intent.

What changes

What serious athletes do differently off the mat.

Without a system

Hard training, inconsistent carryover.

You keep relearning details you already paid for with mat time.

Your progress depends on memory, which means too much gets lost.

Open mat becomes another day of guessing what to work on.

Months of training pile up without a clear picture of your game.

With SubZero

More clarity. More intent. Better carryover.

Walk into class knowing exactly what you want to sharpen.

Keep a real record of what is changing in your game month to month.

Use a tool that builds on your actual history instead of starting from zero.

Turn mat time into a system instead of a blur.

For Serious Athletes