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 Theory
Moon Theory is a beautifully simple, fully private moon companion
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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 Moon Theory: 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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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
Integrate multiple weather APIs for better accuracy.
Assumption to check: Weather apps often have inaccurate forecasts.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize widgets and notifications.
Assumption to check: Lack of customization options.
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed explanations and history of moon phases.
Assumption to check: Limited moon phase information in other apps.
Validate with people who use this workflow before building.
Hypothesis 4
Simple and clear paywall with transparent benefits.
Assumption to check: In-app purchases can be confusing.
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
Moon Theory is a beautifully simple, fully private moon companion. Everything is computed right on your device — no account, no sign-in, no servers, and nothing about you ever leaves your phone. Open it tonight to see exactly where the Moon is in its cycle: a live illuminated glyph, the precise illumination percentage, the current phase name, and tonight's moonrise and moonset for your location. Countdowns show exactly how long until the next new and full moon. FEATURES • Today — a large, live moon glyph drawn from the real illuminated fraction, plus illumination %, phase name, and today's moonrise and moonset in your local time. • Tonight — an at-a-glance look at what the sky is doing tonight. • Calendar — a month grid with a phase glyph on every day; new, quarter, and full days are marked. Tap any day for its phase and rise/set times. • Reminders — optional local notifications for the moments that matter: New, First Quarter, Full, and Last Quarter, each with your own lead time. • Your location, your way — use GPS or enter coordinates by hand. • 12- or 24-hour time. PRIVATE BY DESIGN Moon Theory works entirely offline after your first location fix. There is no backend and no network call in the core app. Your coordinates are used only on your device to compute moon times — never transmitted, never stored remotely, never shared. No analytics. No tracking. No ads. Whether you're planning a night hike, chasing the full moon, or just love knowing what the sky is doing, Moon Theory keeps the Moon at your fingertips — quietly, accurately, and privately.
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
Axios
Redux
React Navigation
expo-location
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.
