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.
Lineup Manager+ is the ultimate baseball and softball lineup app — now with the AI Lineup Assistant and built-in walkup music.
$0.99
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 Lineup Manager+: 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.
Lineup Manager+ is the ultimate baseball and softball lineup app — now with the AI Lineup Assistant and built-in walkup music. NEW: AI LINEUP ASSISTANT Tell it what you need in plain words, like "Mike pitches the first three innings," "Sleva catches at least 3 innings," or "Put Maria at the top of the order." It builds a complete lineup in seconds: every inning's positions plus a batting order, with playing time shared fairly. It follows your team rules, such as "at least 4 girls on the field." It can also use each player's preferred positions and recent games. You always review the lineup before anything changes. Game-day changes are covered too. If a player gets hurt, leaves early or arrives late, uncheck them, add a sub, and regenerate. You choose whether to stay close to the current lineup or start fresh, and innings already played stay exactly as they were. Everything runs on your device with Apple Intelligence. Your roster never leaves your iPhone or iPad. Create and manage multiple teams with a universal player roster. Build detailed lineups with drag-and-drop positioning, assign players to positions inning-by-inning, and track your bench. Set walkup songs for every player with Apple Music, trim tracks to the perfect clip, and play them on game day. Share polished lineup cards with your team via text, email, or AirDrop. Features: • AI Lineup Assistant: fair, complete lineups from your own words • Rebuild a lineup mid-game for injuries, late arrivals and subs • Team rules applied to every lineup, including co-ed rules • Build inning-by-inning lineups with drag-and-drop • Manage multiple teams and a shared player roster • Track throwing hand, batting side and gender for each player • Add temp subs or subs from any of your teams, with their own walkup songs • Set walkup songs for each player with Apple Music • Trim walkup tracks to the perfect clip • Track games with opponents, scores, locations, and weather • Sync games to your calendar automatically • Share lineup cards as images • Email your entire roster in one tap • Customize positions, labels, and team appearance • Keep your screen awake while you run the lineup • Sync across all your devices with iCloud Whether you're coaching rec league or travel ball, Lineup Manager+ keeps your season organized from first pitch to last out. The AI Lineup Assistant requires an iPhone or iPad that supports Apple Intelligence, with Apple Intelligence turned on. Everything else works on every device.
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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 player data and stats tracking.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can be cluttered with too many options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline capabilities.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social sharing features.
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.