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
Moonlitt: Moon Phase Tracker
#1 Moon Tracker App • Apple Design Award 2026 Winner • App of the Day • Great on iOS 26
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
877 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'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 Moonlitt: Moon Phase Tracker: 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 create custom notifications for various moon phases.
Assumption to check: Limited customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time updates for lunar events.
Assumption to check: Inconsistent data updates
Validate with people who use this workflow before building.
Hypothesis 3
Provide users with articles or tips about lunar cycles.
Assumption to check: Lack of educational content about moon phases
Validate with people who use this workflow before building.
Hypothesis 4
Add sharing options for users to share moon phases or events with friends.
Assumption to check: No social sharing features
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
#1 Moon Tracker App • Apple Design Award 2026 Winner • App of the Day • Great on iOS 26 Moonlitt is your complete moon tracker and lunar calendar: a clear, accurate guide to follow the lunar cycle every day. Whether you’re planning Full Moon photography, witnessing the Blood Moon, or exploring lunar traditions, Moonlitt helps you with moon position, timings, and visibility. MOON PHASE & LUNAR CALENDAR • Follow the moon phase with moon illumination and lunar age. • Find exact moonrise, moonset, and culmination times. • See today’s moon phase and browse any date in the lunar calendar. • Receive notifications for Full Moon, New Moon, Blue Moon, and eclipses. KEY FEATURES • Visualize the moon path where you are in AR. • Use the Moon compass to locate the moon in the sky. • Monitor moon position, distance, and timings. • Check weather and moon visibility insights. LUNAR TRADITIONS • Check dates for Chinese moon festivals. • Discover the Wolf Moon, Harvest Moon, and other Full Moon names. • Learn about Moon signs, Constellations, Blood Moon, Blue Moon, and more. SOLAR ECLIPSES & LUNAR ECLIPSES • Visibility maps and local timing for any lunar eclipse and solar eclipse. • Play realistic animations to preview eclipse phases and colors. • Check if buildings or terrain will obstruct your view in AR. THE BEST MOON APP • Widgets, Apple Watch app, and Live Activity for moon phase, moonrise, and moonset. • Works offline, with no ads or tracking. • Built with care by a small indie team. From the first sliver of a New Moon to the brilliance of a Supermoon, with Moonlitt you always know where the Moon is, when it rises, and how brightly it shines. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
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
react-navigation
react-native-gesture-handler
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
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.
