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
MiLB
The MiLB app is your official companion for Minor League Baseball, including all 120 clubs, from Triple-A to Single-A
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
40,334 ratings · Top 15%
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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for MiLB: 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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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.
Hypothesis 1
Expand coverage to include more teams and leagues.
Assumption to check: Limited team coverage compared to major leagues
Validate with people who use this workflow before building.
Hypothesis 2
Create clearer explanations for premium features.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data fetching and caching strategies.
Assumption to check: Slow loading times for live scores
Validate with people who use this workflow before building.
Hypothesis 4
Implement user preferences for tailored news and updates.
Assumption to check: Lack of personalized content
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
The MiLB app is your official companion for Minor League Baseball, including all 120 clubs, from Triple-A to Single-A. • Follow your local team and never miss a game or event. • Buy tickets, browse merchandise, and find promotions from your team tab. • Enjoy a seamless ballpark experience with digital tickets and check-ins. • Personalize your app experience with live game updates and breaking news. • Explore MiLB news and highlights, catch the latest on top prospects, or search teams and players across the league. • Follow the action with pitch-by-pitch updates on Gameday, along with live scores, stats, video highlights and notifications for all 120 teams. SUBSCRIBE & GET EVEN MORE More than 7,000 live MiLB games and complete archives are available with your MLB+ subscription. Your MLB+ subscription now includes audio streams for all MLB games & other live programming, available with log-in on MLB App and MLB.com. Terms of Use: https://www.milb.com/about/terms Copyright © 2026 Minor League Baseball. Minor League Baseball trademarks and copyrights are the property of Minor League Baseball. All Rights Reserved.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
React Native
Expo
Zustand
Axios
React Navigation
React Native Async Storage
BUILD KIT DIFFICULTY
Advanced
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.
