About
Oss is a beautifully crafted BJJ training tracker designed by Brazilian Jiu-Jitsu practitioners and black belts to help grapplers train with intention and progress with proof. At its core, the app enables lightning-fast session logging — capturing Gi/No-Gi mode, session type (training, open mat, seminar, competition), techniques drilled, personal notes, and photos in under 10 seconds after leaving the mat. The technique library includes 500+ built-in moves organized by position and submission, with the ability to add custom techniques, giving practitioners a full picture of their personal game over time. Belt and stripe progression is tracked visually with a timeline, promotion history, coach and academy records, and time spent at each rank — making every milestone memorable. For competitors, Oss logs tournaments and superfights with results, placements, fight counts, and upcoming event countdowns. The analytics dashboard provides a yearly training heatmap, consistency metrics, session frequency, hours trained, and most-drilled techniques — filterable by academy or timeframe. Built with an Apple-first design philosophy, the app features smooth animations, dark mode, gesture-first navigation, and works natively on iPhone and iPad. Critically, it is 100% privacy-first: no accounts, no ads, no cloud tracking, and all data stays on-device. A one-time purchase of $1.99 with no subscription unlocks everything. Ideal for hobbyists building fundamentals, competitors optimizing training camps, coaches managing curriculum, and data-driven athletes at any belt level.
Key Features
- Lightning-Fast Session Logging: Log every training session in under 10 seconds with automatic Gi/No-Gi detection, session type selection (training, open mat, seminars, competitions), technique notes, and photos.
- 500+ Technique Library: Browse and track over 500 built-in techniques organized by position and submission, add custom techniques, and discover your most-used attacks over time.
- Belt & Stripe Progression Tracker: Visualize your entire BJJ journey with a belt timeline, stripe history, promotion records, coach and academy logs, and time spent at each rank.
- Competition Management: Log tournaments and superfights with results, divisions, placements, fight notes, and a countdown timer to your next competition day.
- Training Analytics & Insights: Gain a full picture of your progress with a yearly heatmap, consistency scores, hours trained, session frequency, and most-drilled technique breakdowns filterable by academy or timeframe.
Use Cases
- A white belt logs every class session to build a habit, track techniques learned, and see their consistency heatmap grow over months.
- A competitor preparing for a tournament uses competition tracking to review past results, plan upcoming events, and countdown to fight day.
- A BJJ coach tracks which techniques were drilled each session and uses the academy stats to ensure curriculum coverage across students.
- A purple belt uses the technique library to identify gaps in their game by seeing which positions they rarely drill and deliberately adding them to training.
- A long-term practitioner builds a complete BJJ lineage by logging every academy trained at, every instructor coached by, and every belt promotion received.
Pros
- Complete Privacy — No Accounts or Cloud: All data is stored exclusively on-device with zero accounts, ads, tracking, or subscriptions, giving practitioners full ownership of their training history.
- One-Time Purchase, No Subscription: At $1.99 with no recurring fees, Oss delivers full-featured BJJ tracking at an extremely accessible price point.
- Apple-Native Design: Designed specifically for iPhone and iPad with smooth animations, dark mode, and gesture-first navigation that feels fast and polished in everyday use.
- Built by BJJ Practitioners: Created by black belts who understand the sport, ensuring the features, terminology, and workflow match how athletes actually train.
Cons
- iOS/iPadOS Only: Currently available exclusively on Apple devices (iPhone and iPad), with no Android or web version, limiting access for non-Apple users.
- On-Device Storage Only: Because all data stays on the device for privacy, there is no cloud backup or cross-device sync, so data loss is a risk if a device is lost or reset.
- Limited Social or Community Features: The app is focused on personal tracking and does not offer team collaboration, sparring partner logs, or community sharing features.
Frequently Asked Questions
Does Oss require a subscription?
No. Oss is a one-time purchase of $1.99 with no subscription, no ads, and no hidden fees. Everything is included in the single purchase.
Is my training data stored in the cloud?
No. All data is stored exclusively on your iPhone or iPad. There are no accounts, no servers, and no cloud syncing — your training history remains completely private.
Can I track both Gi and No-Gi sessions?
Yes. Oss features automatic Gi/No-Gi detection and lets you log both training styles, open mat sessions, seminars, and competitions.
What is the Black Belt Calculator?
The Black Belt Calculator is a feature (added in version 1.6) that estimates your progression timeline toward black belt based on your logged training history and consistency data.
Can I export my training data?
Yes. As of version 1.4, Oss supports CSV export, allowing you to extract and analyze your training data in external tools like Excel or Google Sheets.
