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
DraftKings Fantasy Sports
Play PGA Tour, NBA and college basketball, NHL and more DFS for real prizes with the #1 Downloaded Daily Fantasy Sports app†, DraftKings
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
556,100 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 included17 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 DraftKings 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
Provide a guided tutorial for new users.
Assumption to check: User onboarding is often confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Offer advanced filtering and sorting for contests.
Assumption to check: Limited contest filtering options.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize API calls and caching.
Assumption to check: Performance issues during high traffic times.
Validate with people who use this workflow before building.
Hypothesis 4
Ensure UI is responsive and consistent across all screen sizes.
Assumption to check: Inconsistent user experience across devices.
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
Play PGA Tour, NBA and college basketball, NHL and more DFS for real prizes with the #1 Downloaded Daily Fantasy Sports app†, DraftKings. Join millions of fans who've drafted lineups and competed for over $10 BILLION in prizes across NFL, NBA, MLB, NHL, PGA Tour, soccer, golf, UFC, boxing, motorsports, college sports, and more. With DraftKings Daily Fantasy Sports, every game is an opportunity. Play free or enter paid DFS contests for your shot at real cash. Choose from multiple contest types, from salary cap showdowns and snake drafts to Best Ball and Flash Draft, across the biggest pro and college leagues. Whether you're a seasoned vet, a sleeper waiting to break out, or an underdog looking to make a name for yourself, there's a contest for everyone. WHY PLAY ON DRAFTKINGS: – NFL Fantasy Football season long contests – Fantasy mock drafts to test your strategy – Compete in fantasy leagues with friends – Live scoring & leaderboards in every contest – Fantasy Baseball, Basketball, and Football – Exclusive Best Ball tournaments season long – Track player stats, contest entries & winnings – Beginner and experienced player contests ALL THE SPORTS. ALL SEASON LONG: – Fantasy Football – Fantasy Baseball – Fantasy Basketball – Fantasy Hockey – Fantasy Golf – Fantasy Tennis – Fantasy Soccer – Fantasy NASCAR – Fantasy MMA – Fantasy League of Legends – Fantasy Esports HOW TO PLAY: 1. Pick your sport – NFL, NBA, MLB, college football, and more 2. Draft a DFS lineup under the salary cap 3. Challenge friends or face off against others 4. Follow along live for a shot to win real money! From NBA Fantasy Basketball and NHL Fantasy Hockey to College Basketball or PGA Tour Golf DFS, DraftKings offers a full season of action for fantasy veterans, sleeper picks, and underdog players alike. Whether you're prepping for a fantasy basketball league, running mock drafts, or entering daily PGA contests, DraftKings has your lineup covered. —-- Contests not affiliated with or provided by Apple. DraftKings is a US company headquartered in Boston, MA. Privacy Policy: https://www.draftkings.com/help/privacy/us This is a real-money fantasy app. Please play responsibly and only play what you can afford. For gambling addiction help and support, call 1-800-GAMBLER / 1-800-522-4700, visit https://www.ncpgambling.org, or call 877-8-HOPENY/text HOPENY (467369) (NY). Help is available for problem gambling. Call (888) 789-7777 or visit ccpg.org(CT). 18+ in most eligible states. Paid Daily Fantasy Sports contests not available while physically located in HI, ID, LA (select parishes) MT, NV, OR and WA. Winning a contest on DraftKings depends on knowledge and exercise of skill. Available to play for free. For entertainment purposes only. Void where prohibited. See terms at http://draftkings.com. Ticket rewards are equivalent to site credits and are only valid for use on eligible DraftKings contests. Ticket rewards have no cash value, are non-refundable, non-transferable, and non-withdrawable. Ticket rewards expire at the start of the eligible contest for which they were issued. Promotion eligibility, deposit, and play restrictions may apply. To learn more about current promotions and associated terms, see draftkings.com/promos. † #1 Daily Fantasy Sport App: According to SensorTower data, since January 2012, DraftKings Daily Fantasy Sports App has the highest number of downloads from U.S. app stores among fantasy sports apps.
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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
Axios
React Navigation
React Native Paper
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.
