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.
Create fair yet competitive lineups fast with the App that thinks like a coach.
$4.99 · In-app purchases
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 Play Ball Lineup - Youth Baseball and Softball Lineup Maker: 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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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: Limited user reviews and low rating indicate dissatisfaction with features.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of advanced features such as real-time updates or player statistics.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases may confuse users regarding what is free vs. paid.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Interface may feel cluttered and not user-friendly.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Create fair yet competitive lineups fast with the App that thinks like a coach. PLAY BALL LINEUP is a revolutionary youth baseball and softball lineup-making App. With PLAY BALL LINEUP, the App actually creates the lineup based on the strategy provided by the coach; thereby saving the coach from the time-consuming responsibility of creating an equitable yet competitive lineup game after game after game. And, if you don’t agree with the lineup the App created, you can tweak it to get it just right. PLAY BALL LINEUP has two strategy modes a coach can use to create a lineup: Instructional Play and Competitive Play. Each strategy mode contains easy to use settings and inputs designed to completely customize a fair yet competitive lineup for game day success. Whether you need to create a lineup where everyone is encouraged to play everywhere, or where you're playing to win and every player has a spot, PLAY BALL LINEUP puts your players and team in the best position to play safe, have fun and succeed on game day. PLAY BALL LINEUP is also ideal for men's and women's baseball and softball leagues. PLAY BALL LINEUP is a universal App that has been designed for iOS 8 for use on your iPhone and iPad. FEATURES: •Create new lineups from scratch or modify an existing lineup to save time. •Add, save and delete lineups and teams. •List up to 15 players per team. •Create lineups from 3 to 7 innings. •Create lineups with up to 12 positions. •Apply various ‘Local Rules’ (i.e. All players should play at least 2 innings in infield). •Apply Fielder Skill Level ratings to your players. •Choose from two strategy modes: Instructional Play and Competitive Play •Tell the app what players are playing in the game. •Choose the number of innings you want each player to play and the positions you want each player to play. •Specify the innings you want your pitchers to pitch and your catchers to catch. •Ability to let the App choose the positions for you instead. •Choose up to 5 key positions and the innings to dictate the strength of defense during the game. •Ability to tweak the lineup or shuffle the lineup to make another one •Ability to set a batting order. •Final lineups converted to PDFs. •Ability to email PDFs to yourself/others. •Print out the lineup and batting order for the dugout.
Written user reviews are not shown here. Check current App Store reviews >
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.