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
Lunar - Moon Phase & Widgets
Lunar: Moon Phase & Widget brings the magic of the Moon right to your iPhone, iPad, and Apple Watch
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
6,339 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Lunar - Moon Phase & Widgets: 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
Allow users to fully customize widget appearance and data.
Assumption to check: Limited customization options for widgets
Validate with people who use this workflow before building.
Hypothesis 2
Provide manual location input for better accuracy.
Assumption to check: Location services can be inaccurate
Validate with people who use this workflow before building.
Hypothesis 3
Implement smooth transitions and animations for a more engaging experience.
Assumption to check: Basic UI lacks engaging animations
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature to share moon phase data on social media.
Assumption to check: No social sharing options
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
Lunar: Moon Phase & Widget brings the magic of the Moon right to your iPhone, iPad, and Apple Watch. Track the current moon phase, moonrise and moonset times, and upcoming Full Moon, New Moon, and Lunar Eclipse with stunning accuracy and realism. Experience a beautiful Liquid Glass design and real-time, 3D-lit Moon renderings that make the Moon feel alive on your device. Effortlessly explore any date—past or future— to see precise lunar data, illumination, distance, and the Lunar Zodiac sign for that day. Switch to the Moon Phase Calendar to view the entire month’s lunar cycle at a glance, or tap a date for detailed moon information. Perfect for astronomy enthusiasts, photographers, or anyone who loves the night sky. Personalize your experience with a variety of Home Screen and Lock Screen widgets (including compact and expanded formats) that keep lunar information always in view. Receive notifications for Full Moon, New Moon, and Eclipse events, and stay connected with your Apple Watch using the included Lunar Compass to locate the Moon’s position in the sky. Whether you’re planning stargazing sessions, tracking tides, or simply admiring the beauty of the cosmos, Lunar: Moon Phase & Widget is your essential moon tracker—designed with care, precision, and a touch of lunar wonder. ------- Subscription Apple's standard terms of service apply to all subscriptions available in the app. If you purchase a subscription, payment will be charged to your Apple ID Account. You will be automatically charged for renewal unless auto-renew is turned off at least 24-hours prior to the end of the current subscription period. You can turn off auto-renew at any time by going to your Account Settings on the App Store after purchase. All purchases are final and refunds will not be provided for any unused portion of the term. You will be automatically billed for the full amount at the end of the free trial period unless you cancel within 24-hours before the end of the free trial period. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ -------
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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 Navigation
Zustand
Expo Constants
React Native Reanimated
React Native Vector Icons
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.
