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
MOON - Current Moon Phase
MOON is your personal lunar portal.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
29,931 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 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 MOON - Current Moon Phase: map the core Weather workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
MOON is your personal lunar portal. ++ Best User Experience - Webby Awards 2017 Honoree ++ Never be caught off-guard by moon-related craziness again. View the current moon phase or what the moon will look like on a certain date, see countdowns to moon events, receive notifications with enough time to avoid unpleasantness, and share what the moon looks like on any day with your friends. MOON is the most thoughtful moon phase calendar available. It becomes increasingly useful the more you use it. Enjoy. Features * Works offline, never be stranded without lunar positioning * Notifications before Full Moons, New Moons, and other special lunar events * Widget for your Home Screen * Share the current moon with the iMessage app * View what the moon looks like on any date * Share what the moon looks like on any date to Facebook, Twitter, iMessage etc. * Save current moon image to camera roll * Lunar illumination percentage * Countdown to upcoming New and Full Moons * Beautiful animated, layered spacescape * Hemisphere setting * Universal app * Support for iPhone, iPad, and Apple Watch * Built for iOS 12+ * Shake for Star Harp Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://moonapp.me/privacy.html
Written user reviews are not shown here. Check current App Store reviews >
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
Include more comprehensive data and educational content about moon phases.
Assumption to check: Limited features for detailed moon information
Validate with people who use this workflow before building.
Hypothesis 2
Offer more value in the free tier to improve user retention.
Assumption to check: In-app purchases may deter free users
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set custom alerts based on specific moon phases.
Assumption to check: Lack of customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 4
Update the design with modern UI elements and animations.
Assumption to check: User interface may feel dated
Validate with people who use this workflow before building.
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
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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.
