Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
BJJ Brown Belt Requirements
Brown Belt in Brazilian Jiu Jitsu is not just about being effective
$19.99 · In-app purchases
PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
7 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for BJJ Brown Belt Requirements: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Include interactive quizzes or progress tracking.
Assumption to check: Limited interactivity with content
Validate with people who use this workflow before building.
Hypothesis 2
Add forums or chat for users to interact.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven suggestions based on user progress.
Assumption to check: No personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Regularly update content and offer new techniques.
Assumption to check: Static content doesn't engage users
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Brown Belt in Brazilian Jiu Jitsu is not just about being effective. It's about being efficient. In this beautifully filmed app, Roy Dean shows practitioners how to lead the physical debate through pressure and movement options. A special time in the development of all jiu jitsu players, brown belt is a rediscovery of the basics, with the aim of perfect execution. Chapters include: Welcome Overview Pressure Leg Locks Top Game Bottom Game Passing the Guard Counters and Escapes Expressing the Technique Combination Meditation Brown Belt Evaluation Brown Belt Demonstration Naples Rolling Naples Analysis TJ and Brendan "This is Roy Dean’s most advanced, most informative and most sophisticated app yet. It’s absolutely packed with techniques, combinations and details that will take your techniques, and especially your attacks, to the next level” - Stephan Kesting
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
axios
react-navigation
expo-av
BUILD KIT DIFFICULTY
Intermediate
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
