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
Fantrax Fantasy Sports
WELCOME TO THE HOME OF FANTASY SPORTS!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,860 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 included18 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 Fantrax Fantasy Sports: 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 settings more flexibly.
Assumption to check: Limited customization options for league settings
Validate with people who use this workflow before building.
Hypothesis 2
Implement cleaner design with better organization of elements.
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Create a clearer explanation of premium features and benefits.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Optimize data fetching and caching to improve performance.
Assumption to check: Slow loading times for data updates
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
WELCOME TO THE HOME OF FANTASY SPORTS! Unleash the finest fantasy experience – crafted for champions, by champions, and unbelievably, it’s entirely FREE! Ever felt confined by the limitations of ESPN and Yahoo? It’s time to elevate your game with Fantrax, where empowerment and unparalleled customization await at every corner! DIVERSE LEAGUES – INFINITE POSSIBILITIES! Whether you’re into NFL, MLB, NBA, NHL, College Sports, NASCAR, Formula 1, PGA Golf, or Premier League Soccer, we’ve got the perfect playground for you. Craft, customize, and command any type of league – the power is all yours! EXCLUSIVE FEATURES – A LEAGUE ABOVE THE REST! Immerse yourself in features unseen in the fantasy industry: - YEAR-ROUND ENGAGEMENT: Off-season trades, real-time updates, and seamless player transactions keep the excitement alive 365 days a year! - DYNASTY MASTERY: Automated salaries and contracts let you orchestrate your league like a pro! - MULTI-TEAM TRADES: Elevate your strategies with trades involving more than two teams. - LIVE CHAT & MEDIA SHARING: Connect, strategize, and share moments in real-time! - ULTIMATE CUSTOMIZATION: Tailor rosters, scoring, playoffs/consolations and more to your liking. - FUTURE DRAFT PICK TRADES: Plan and trade draft picks for seasons to come. - UNIQUE SCORING CATEGORIES: Use our extensive list or create your own. - MASSIVE LEAGUE SIZES: Ever imagined a 200+ manager league? Create it here! - TRANSACTION CONTROL: A misclick won’t cost you the season, undo any transaction instantly. - DUPLICATE PLAYERS: Multiply the fun with any number of duplicates of players! - EXCEPTIONAL CUSTOMER SUPPORT: Quick, responsive, and genuinely helpful. - MULTI-DIVISION LEAGUES: Expand the competition and the thrill! ENGAGE, COMPETE, TRIUMPH – ALL FOR FREE! Don’t let another season of potential and thrill slip away! Download Fantrax now and explore the boundless possibilities of the most formidable Fantasy Sports platform
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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
Zustand
Supabase
React Navigation
Axios
BUILD KIT DIFFICULTY
Expert
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.
