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
Milky Way: Cosmic Playground
If you're a fan of Solar Smash, Universe Sandbox, Spaceflight Simulator, Solar System Sim; this is your new favorite game!
$14.99 · In-app purchases
PRICE
$14.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,325 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
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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 included15 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 Milky Way: Cosmic Playground: map the core Reference 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
Add interactive 3D models of celestial bodies.
Assumption to check: Limited exploration features compared to other educational apps
Validate with people who use this workflow before building.
Hypothesis 2
Offer more content in free tier to attract users.
Assumption to check: High price for premium features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to contribute discoveries or content.
Assumption to check: Lack of user-generated content
Validate with people who use this workflow before building.
Hypothesis 4
Implement a guided tour or onboarding process.
Assumption to check: Navigation can be confusing for new users
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
If you're a fan of Solar Smash, Universe Sandbox, Spaceflight Simulator, Solar System Sim; this is your new favorite game! Milky Way: Explore, Simulate, and Discover the Cosmos Unlock the mysteries of the universe with Milky Way, the revolutionary space app that transforms traditional stargazing into an interactive experience. Unlike passive space apps, Milky Way lets you dive into space simulations, manipulate gravity, and experiment with real-time planetary collisions. Perfect for space enthusiasts, students, and anyone with a cosmic curiosity, this app combines stunning visuals with state-of-the-art technology, allowing you to explore the cosmos like never before. Hyper-Realistic Space Simulations Our advanced simulation engine brings space to life with hyper-realistic planetary collisions, gravity simulations, and more. Watch as planetary bodies interact under different forces, create your own sandbox environment, and experiment with different scenarios to better understand how the universe works. This what-if tool lets you test the effects of gravitational forces, simulate planetary impacts, and even alter the course of entire galaxies.
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
Supabase
TypeScript
React Navigation
Zustand
BUILD KIT DIFFICULTY
Intermediate
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.
