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: Sports & Casino
Now Live in All 50 States! Game day’s calling
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,358,301 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: Sports & 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
Now Live in All 50 States! Game day’s calling. Get in on the action with DraftKings Sports & Casino. Sportsbook: Download the DraftKings Sports & Casino app to access the latest sportsbook markets and bet on your favorite sports all season long, including NFL football, NBA basketball, MLB baseball, NHL hockey, Soccer, PGA Tour Golf, UFC, MMA, Boxing, Motorsports, Esports, LOL, College Sports, and more. From moneyline bets and parlays to player props and more, take your shot at winning big with DraftKings Sports & Casino. The action doesn’t stop once the game begins. Get your live bet down with DraftKings Sports & Casino, your sportsbook home for live betting. Whether the game just started or going down to the wire, you can place live bets as the game unfolds on the Sportsbook experience. Between plays, during the break, or just before the gates open, place a bet in various markets for a shot to bring home big winnings. Crunch time. Anytime. Follow the action and bet live as the game unfolds. • Live Betting & In-Game Odds: Bet on every snap, first down and touchdown with real-time spreads, moneylines, totals and dynamic odds that update as the game evolves. • Same-Game Parlays: Stack your MVPs, touchdown scorers and game totals into a single ticket for greater payout potential. • Player Props for Every Sport: From NFL quarterbacks to NBA point guards, lock in markets on passing yards, rushing TDs, free throws and more. Predictions: Stay ahead of the moment with DraftKings Predictions within the app. Make trades and predict outcomes across sports, pop culture, and real-world events in interactive prediction markets. From big games to trending moments, follow along and see how your predictions turn out. Horse Racing: In addition to sports betting on Sportsbook, customers can access horse racing and horse race betting through DraftKings Racing within the app. While accessible in the DraftKings Sports & Casino app, both DraftKings Racing and DraftKings Predictions operate separately from Sportsbook and are subject to different regulatory requirements. – SPORTSBOOK: Sportsbook available here: https://sportsbook.draftkings.com/help/sports-betting/where-is-sports-betting-legal Bets with DraftKings Sportsbook are not affiliated with or provided by Apple. DraftKings is a US company with headquarters in Boston, Massachusetts. DraftKings is licensed in the State of Connecticut - License OGO.000003 GAMBLING PROBLEM? CALL 1-800-GAMBLER, or 1-800-MY-RESET, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD), 1-800-981-0023 (PR). 21+ (18+ DC/NH/PR/WY). Void in CAN. Eligibility restrictions apply. Terms: draftkings.com/sportsbook. On behalf of Boot Hill Casino (KS). Fees may apply in IL. Casino available in CT/MI/NJ/PA/WV ONLY #1 Sportsbook for Live Betting - Based on available live market data RACING: Horse race betting available here: dkng.co/whereisracingavailable PREDICTIONS: Event Contract Trading is offered by DraftKings Predictions is a CFTC-registered introducing broker and NFA member. Trading involves risk of loss and may not be suitable for all users. Predictions available here: https://dkng.co/predictions-availability Must meet age and eligibility requirements to use DraftKings. Promotional eligibility and requirements vary. For full terms and conditions, see draftkings.com. Bonus Rewards are single-use, non-withdrawable, non-refundable, have no cash value, and subject to transaction, redemption, and expiration restrictions. Privacy Policy: https://www.draftkings.com/help/privacy/us
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
Simplify navigation and reduce clutter.
Assumption to check: User interface can be overwhelming with too many options.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API calls and implement caching.
Assumption to check: Slow loading times during peak hours.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate in-app chat for immediate support.
Assumption to check: Limited customer support options.
Validate with people who use this workflow before building.
Hypothesis 4
Ensure uniformity in odds presentation across screens.
Assumption to check: Inconsistent betting odds display.
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 Navigation
Axios
React Query
Supabase
Expo
Zustand
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.
