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 Sportsbook & Casino
Play every game and live every moment with FanDuel!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,309,042 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 FanDuel Sportsbook & Casino: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Play every game and live every moment with FanDuel! Sportsbook: Bet on NFL, NBA, MLB, and more with real-time odds, live in-game markets, and same game parlays. Place bets lightning fast, and get your winnings even faster. Live Betting & Same Game Parlays: Build your bet in real time as the game unfolds. Instant Payouts: Winnings hit your account fast, no waiting around. Rewards Club: Join our rewards program to get rewarded for how you play. Refer a Friend: No matter where your friends are, refer them to FanDuel for a bonus today Predicts: Make your call — a matchup, a player's night, a single moment — and watch it unfold live, right in the app. Combo Builder: Stack up to 8 predictions Live Scoring: Watch your predictions track in real time as the action happens. Secure Checkout & Withdrawals: Move money in and out safely, every time. Get the FanDuel app and get in the game, however you play it. See where Sportsbook and Predicts are available here: https://www.fanduel.com/legal-sports-betting-us-map Available based on combination of Sportsbook, Predictions, and/or Free-to-Play product availability, which varies by state. Gambling Problem? Call 1-800-GAMBLER or 1-800-MY-RESET. Call 1-888-789-7777 or visit ccpg.org/chat (CT). Hope is here. GamblingHelpLineMA.org or call (800) 327-5050 for 24/7 support (MA). Visit www.mdgamblinghelp.org (MD). Call 1-877-8HOPE-NY or text HOPENY (467369) (NY). 21+ (18+ D.C., WY) and present in select states (for KS, in affiliation with Kansas Star Casino). FanDuel Sportsbook: First online real money wager only. Min $5 wager required for 7 consecutive days. $5 first deposit required. Bonus issued as nonwithdrawable bonus bets which expire 7 days after receipt. Max referral bonus $250 unless otherwise specified. Referred players must deposit $5+ and place and settle a $5+ wager or trade within 30 days after signing up on FanDuel Predicts or FanDuel Sportsbook. Limit 10 referrals per 30 days. Bonus bets are non-withdrawable and expire 7 days after receipt. Restrictions apply. See terms at sportsbook.fanduel.com. Call 1-877-770-7867 (LA). Gambling Problem? Call 1-800-GAMBLER or 1-800-MY-RESET. Nationwide based on combination of Sportsbook, Predictions, and/or Free-to-Play product availability, which varies by state. FanDuel Predicts: Offered by FanDuel Prediction Markets LLC, a registered futures commission merchant. 18+. Offer only valid in AK, AL, CA, DE, FL, GA, HI, ID, MN, ND, NE, NM, OK, RI, SC, SD, TX, or UT. First real money trade only. First-time deposit required. Min. $1 trade required for 5 consecutive days for max bonus. Bonus issued as non-withdrawable Predicts Bonus that expires 24 hours after receipt. Restrictions apply. Trading derivatives involves significant risk and may not be suitable for all investors. Manage your activity with our Consumer Protection tools. See terms at: fanduel.com/predicts/new-customer-offer.
Written user reviews are not shown here. Check current App Store reviews >
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
Implement a guided tutorial for new users.
Assumption to check: Users often find the betting options overwhelming and confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize backend and increase server capacity.
Assumption to check: Frequent crashes during high traffic periods.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate more payment methods.
Assumption to check: Limited payment options for deposits and withdrawals.
Validate with people who use this workflow before building.
Hypothesis 4
Add a live chat feature for immediate assistance.
Assumption to check: Lack of customer support responsiveness.
Validate with people who use this workflow before building.
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
Zustand
React Navigation
Axios
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.
