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
FanDuel Picks
america’s #1 sportsbook now offers fanduel picks - the easiest way to get in on the action!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
15,008 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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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 FanDuel Picks: 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 their pick preferences based on deeper analytics.
Assumption to check: Limited personalization options for picks
Validate with people who use this workflow before building.
Hypothesis 2
Simplify subscription options and provide clear value for premium features.
Assumption to check: In-app purchase complexity
Validate with people who use this workflow before building.
Hypothesis 3
Introduce social features such as user forums or chat.
Assumption to check: Lack of community engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Implement guided onboarding tutorials to help users navigate.
Assumption to check: Overwhelming information for new 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
america’s #1 sportsbook now offers fanduel picks - the easiest way to get in on the action! fanduel picks is live in alabama, alaska, arkansas, georgia, minnesota, missouri, nebraska, new hampshire, new mexico, north dakota, oklahoma, oregon, rhode island, south dakota, texas, utah, and wisconsin. fanduel picks makes every game more exciting. just pick your favorite athletes, predict more or less, and compete for a chance to win real cash prizes. no salary caps. no drafts. just pick. predict. win! plus, win up to 1000x your entry fee with a perfect lineup. why you’ll love fanduel picks: easy to play: pick 3-6 players, predict "more" or "less” on their projected stat line, and submit your lineup. real-time tracking: follow your lineup live and sweat every play. guaranteed multiplier: if you build a perfect lineup, you could win up to 1000x your entry fee. the multiplier value varies based on the number of picks in a lineup, players, and stats selected. how it works: make your picks: select 3-6 players to build your lineup. your potential payout will vary based on the number of picks and level of difficulty in your lineup. predict stats: each player has a projected stat line. choose “more” if you think they’ll exceed it, or “less” if you think they’ll fall short. track picks & win big! earn 1 point for each correct pick. top scores split a prize pool. build a perfect lineup to win up to 1000x your entry fee. download fanduel picks today! ready to turn your sports knowledge into real winnings? download fanduel picks now and get in on the action! download now and start playing!
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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/native
zustand
react-native-reanimated
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.
