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
MLB
The MLB App is the #1 destination for live baseball video and audio, directly on your iOS device
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
933,011 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 included18 files
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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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 MLB: 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
Implement a local database to cache data for offline access.
Assumption to check: Limited offline functionality, making it hard to access information without internet.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a premium subscription with an ad-free experience.
Assumption to check: Too many ads can disrupt user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation structure and enhance the onboarding process.
Assumption to check: Navigation can be confusing with too many options.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize API calls and implement loading indicators.
Assumption to check: Slow loading times for game updates and news articles.
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 MLB App is the #1 destination for live baseball video and audio, directly on your iOS device. Watch and listen live or on-demand! -- Jump directly into your favorite team's live game from your home tab -- Customize and filter your News content for the headlines that interest you most -- Get real-time highlights and on-deck alerts for your followed players -- Follow the action of the game with real-time player positions and batted balls -- Live Activities support for game updates right on your lock screen WATCH & LISTEN, FREE -- The Watch experience has 24/7 personalized programming, curated content collections and the deepest baseball-on-demand video library anywhere -- Watch free in-game, real-time highlights for every game -- Watch select Minor League Baseball games -- MLB Film Room: Search millions of videos -- Picture-in-Picture streaming for live video and highlights -- Watch MLB Network programming (pay TV authentication required) SUBSCRIBERS GET MORE -- Access your The Official Site of Major League Baseball subscription to watch every out-of-market game -- Stream MLB Network 24/7 on the MLB app -- Listen to Home, Away and Spanish-language (where available) radio broadcasts live and on demand with MLB At Bat -- Watch 7,000+ Minor League Baseball games with MLB At Bat -- Universal audio support for MLB+ subscribers, accessible on iPhone, iPad and other supported smartphones and tablets Privacy Policy: MLB Privacy Policy | MLB.com Terms of Use: MLB.com Terms of Use | MLB.com © 2026 MLB Advanced Media, L.P. All Major League Baseball trademarks and copyrights used herein are the property of the applicable MLB entity. All rights reserved.
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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
Firebase
BUILD KIT DIFFICULTY
Expert
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.
