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
Doodle Baseball Game
Doodle Baseball MLB Style Sports Game
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
2,682 ratings · Top 5%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Doodle Baseball Game: map the core Games 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
Introduce multiple game modes and difficulty levels to enhance replayability.
Assumption to check: Limited game modes and levels
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly ad experience or offer an ad-free purchase option.
Assumption to check: Ads can disrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 3
Add multiplayer or social sharing features to engage users.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate daily challenges and reward systems to increase user engagement.
Assumption to check: No daily challenges or rewards
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
Doodle Baseball MLB Style Sports Game Step up to the plate in Doodle Baseball, a fast and exciting baseball sports game inspired by MLB action and classic Google arcade games. Swing for home runs, time your hits perfectly, and enjoy quick, competitive matches filled with baseball excitement. Whether you are a baseball fan, a softball player, or someone who enjoys casual sports games, Doodle Baseball delivers smooth gameplay and satisfying action. MLB Inspired Baseball Gameplay Experience professional style baseball action with: - Home runs and power hits - Fast pitching mechanics - Precise swing timing - Competitive high score challenges - Stadium inspired atmosphere Enjoy the thrill of MLB style baseball in a fun and creative doodle world. Baseball and Softball Action This sports game blends elements of both baseball and softball, making it perfect for players of all ages. Quick matches and simple controls allow you to jump in and play anytime, whether at home or on the go. Easy Controls, Addictive Sports Gameplay Tap to swing, pitch, and score runs. The simple mechanics make it easy to start playing, while skill based timing keeps the gameplay challenging and rewarding. Compete to beat your best score and improve every inning. Arcade Sports Game with Google Style Charm Inspired by the creativity of popular Google games, Doodle Baseball features hand drawn characters, colorful fields, smooth animations, and energetic sound design. It combines arcade fun with the competitive spirit of baseball. If you enjoy MLB games, baseball games, softball games, arcade sports games, or Google style casual games, Doodle Baseball is designed for you. Download now and experience fast, competitive baseball action in a creative doodle sports world.
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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
react-navigation
expo-animations
expo-av
BUILD KIT DIFFICULTY
Starter
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.
