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.
Find the player props and lines the books got wrong
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for OPTIMAL: Player Props & 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Find the player props and lines the books got wrong. Optimal compares every major sportsbook and pick'em app, grades every edge and shows you the best price on every line. 7,700+ five-star ratings. 275,000+ users. OPTIMAL EV: GRADED +EV PICKS • Lines at any sportsbook priced better than the true odds, graded by edge • EV, chance to hit and suggested units on every pick • Pick alerts: a push the moment a new edge drops PLAYER PROPS & PREDICTIONS • Player prop projections: floor, projection and ceiling against the line • Hit rates, recent games, lineups and injuries • Trends: players on a hot streak against today's lines CHEAT SHEETS FOR PICK'EM & DFS • The best picks on PrizePicks, Underdog, Sleeper, DraftKings Pick6 and more, ranked by edge • Swipe Mode: swipe right on picks to build a slip PARLAY BUILDER • Fair odds and the estimated chance your parlay hits • Track the slip and watch every leg live ODDS COMPARISON & SHARP TOOLS • Compare every book's odds, with the best price on each side • Live odds during the game: spread, total and moneyline • Sharp Books: lines at your sportsbook that the sharpest books say are mispriced • Arbitrage: when two books disagree enough to cover both sides, with the stake for each side LIVE SCORES & PLAY-BY-PLAY • Live scores for every game, with your games first • Big plays as they happen, with fantasy points and what each play did to your picks • Every play of a game, player by player FANTASY PROJECTIONS • Free projections and rankings for NFL, NBA, MLB, NHL and WNBA • PPR, Half PPR, Standard or your own scoring • Compare players side by side for start/sit calls SPORTS NFL, NBA, MLB, NHL, WNBA, college football, college basketball, MLS, tennis and MMA. FREE AND OPTIMAL+ Optimal is free to download. Live scores, odds, fantasy projections, Swipe Mode and research are free for everyone. Optimal+ unlocks the rest: Optimal EV, Sharp Books, Arbitrage, Trends, player projections, every cheat sheet and pick alerts. New subscribers can start with a free trial. • Payment is charged to your Apple Account when you confirm the purchase. • Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the period ends. • Manage or cancel anytime in your Apple Account settings. • Any unused part of a free trial is forfeited when you buy a subscription. PLAY RESPONSIBLY Optimal provides sports data and analytics only. We do not accept wagers, and no outcome is guaranteed. You must be 21+ to wager. If you or someone you know has a gambling problem, call 1-800-GAMBLER. Terms of Service: https://www.optimal-bet.com/terms Privacy Policy: https://www.optimal-bet.com/privacy Support: [email protected]
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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
Assumption to check: Users find it difficult to understand betting strategies.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent odds updates.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited sports coverage.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Subscription model can be confusing.
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.