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
Monster League Fantasy
Fantasy Football - Reimagined
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.8
737 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 included16 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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Monster League Fantasy: 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
Allow users to customize league rules and team logos
Assumption to check: Limited customization for teams and leagues
Validate with people who use this workflow before building.
Hypothesis 2
Provide detailed analytics and performance tracking features
Assumption to check: Difficulty in tracking player performance and stats
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social features for users to communicate and share tips
Assumption to check: Lack of social features like chat or forums
Validate with people who use this workflow before building.
Hypothesis 4
Implement a cleaner, more organized UI design for better navigation
Assumption to check: User interface can be cluttered
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
Fantasy Football - Reimagined In Monster League, every matchup is more than a game—it’s a battle. Draft your squad, pick your opponents, and “capture” players by outscoring them in head-to-head matchups. Build your roster week after week until you’ve assembled an unstoppable team of football Monsters. Key Features: - A totally new take on Fantasy Gameplay – Start with 3 low-level players (QB, RB, WR) and face off against opponents. Outscore them to capture & grow your roster as the season unfolds. - Elemental Type Advantage System – Each real-life Pro Football team has an elemental identity (Fire, Ice, Ground, etc.). Use these strengths and weaknesses to gain an edge in matchups. - Elite 3 Bosses – Endgame playoff challenge! Defeat boss-level rosters to prove you’re the ultimate champion. - Dynamic Weekly Strategy – Every game matters. Optimize matchups, experiment with types, and keep your squad evolving. Why Monster League? Unlike traditional fantasy football, Monster League isn’t about managing trades or waiver wires. It’s about battling, capturing, and building your dream roster. Whether you’re a die-hard Football fan or love strategy games, this is fantasy football reimagined. Download now and begin your quest for fantasy football glory!
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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
Supabase
React Navigation
Axios
Zustand
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.
