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
Baseball Time Machine
Baseball Time Machine puts 150+ years of baseball history in your hands.
$0.99
PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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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
Baseball Time Machine puts 150+ years of baseball history in your hands. Spin the dial to any season between 1871 and 2025 and instantly see everything that mattered that year — who won the World Series, how the pennant race played out, which pitchers dominated, which rookies arrived, and which legends took their final bow. WHAT YOU'LL FIND Champions & Postseason — World Series winners, league champions, and the full playoff bracket from Wild Card through to the Fall Classic. Final Standings — American League and National League standings, division by division, exactly as the season ended. League Leaders — The season's best in home runs, batting average, strikeouts, and ERA. Season Awards — MVP, Cy Young, Rookie of the Year, Manager of the Year, and more, for every year they've been awarded. New Faces — Every player who stepped onto a major league field for the first time that season. Final Season — The players whose careers quietly — or famously — came to an end. Hall of Fame — Every inductee, every class, going all the way back to 1936. BUILT FOR BASEBALL FANS Whether you're settling a bar argument, reliving a childhood season, or just curious what baseball looked like in 1927 or 1969 or 1994, Baseball Time Machine gives you the full picture in seconds. Powered by the Lahman Baseball Database — the gold standard for historical baseball statistics, trusted by researchers, journalists, and fans for decades. Designed with a timeless aesthetic inspired by vintage scorecards, flip-board scoreboards, and newspaper box scores. Data source: Lahman Baseball Database (SABR), covering 1871–2025.
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
