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.
Batter Up is the simplest way to give every player on your baseball or softball team a walk-up song — and a voice intro to match.
$2.99
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 Batter Up: Your Walk Up DJ: 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.
Batter Up is the simplest way to give every player on your baseball or softball team a walk-up song — and a voice intro to match. Built for coaches & parents, by a coach & parent. No analytics, no ads, no accounts required. WALK-UP MUSIC, YOUR WAY - Search the full Apple Music catalog right inside the app (Apple Music subscription required to play catalog tracks) - Or pick any song from your iPhone or iPad's local music library - Trim each song to the perfect snippet with a simple two-handle clip slider - A player's song plays the moment they step into the batter's box WALK-UP VOICE INTROS - Record a short clip in-app — your voice, the player's voice, or the announcer's - Or have an Apple voice say each player's name — no recording needed - The intro plays right before the walk-up song, every at-bat SHARE YOUR ROSTER - Tap Share Roster to get a 6-character team code for another coach or parent - They enter it in Batter Up and the whole team appears — players, songs, clip times, batting order, and voice intros - Songs are matched to Apple Music automatically, right down to the version - Made changes? Share again and the same code picks them up GAME DAY THAT JUST WORKS - Current batter, on-deck batter, and the rest of the lineup at a glance - Once a walk-up finishes, the on-deck card grows so you always know who's next - Tap any card to jump the at-bat — or use Next / Previous - Pause and resume mid-song without losing the at-bat - Warmup and between-innings music that pulls from your players' songs in your music library - Find any speaker, AirPlay device, or Bluetooth output in one tap TEAM AND ROSTER MANAGEMENT - Multiple teams, each with its own colors, emoji, and team photo - Drag-to-reorder the lineup, bench, and team list - Move players between lineup and bench with
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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: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor performance
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.