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
Fantasy Cup
Fantasy Cup - The ultimate 2026 World Cup fantasy game.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 Fantasy Cup: 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 team logos and league settings more extensively.
Assumption to check: Limited customization options for teams and leagues
Validate with people who use this workflow before building.
Hypothesis 2
Implement live scoring updates and notifications for player performances.
Assumption to check: Lack of real-time updates during games
Validate with people who use this workflow before building.
Hypothesis 3
Create an interactive tutorial to guide users through the app's features.
Assumption to check: Difficult onboarding process for new users
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options to allow users to post their achievements on social media.
Assumption to check: Insufficient social features for sharing achievements
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 Cup - The ultimate 2026 World Cup fantasy game. Pick your teams before the tournament begins, compete against players from around the world in public leagues or play against your friends in private leagues. Watch your standings update automatically as matches are played — no manual scoring, no hassle. HOW IT WORKS • Sign up with only your email address • Create or join a league with players from around the world, or with friends and family • Set a draft date — each manager picks their teams in order • Teams score points based on real match results throughout the tournament • The manager with the most points when the final whistle blows wins FEATURES • Live draft for public leagues — players may draft themselves or allow auto picks • Async draft for private leagues — no need to be online at the same time • Auto-pick fills your remaining picks if time runs out • Live score syncing throughout every match day • Push notifications for draft turns and match updates • Wild card and extra credit picks for bonus points • Clean, fast interface built for the tournament schedule Make this World Cup the best one yet. Set up your league, invite your group, and get your picks in before kick-off. Fantasy Cup is a one-time purchase. No subscriptions, no in-app purchases, no entry fees — just the joy of the tournament. Fantasy Cup is an independent app and is not affiliated with or endorsed by FIFA or any official tournament organizer.
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 Navigation
Supabase
Redux
Axios
Expo
BUILD KIT DIFFICULTY
Advanced
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.
