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
LighthouseMap
Explore over 69,500 lighthouses and navigation aids across every country on
$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.
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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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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 included16 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 LighthouseMap: map the core Travel 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
Implement a personalized recommendation engine based on user preferences.
Assumption to check: Users often find it difficult to discover new locations.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and provide a tutorial for first-time users.
Assumption to check: In-app navigation can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Add a robust review and rating system to increase user interaction.
Assumption to check: Limited user engagement features such as reviews.
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline map access and downloadable content for users.
Assumption to check: Lack of offline capability for map access.
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
Explore over 69,500 lighthouses and navigation aids across every country on Earth. LighthouseMap brings together data from five authoritative sources into one beautiful, easy-to-use map. One-time purchase — no subscriptions, no ads, no tracking, no hidden costs. INTERACTIVE MAP Tap numbered coastal bubbles to drill down from world view to individual lighthouse pins. Switch between Standard, Hybrid, and Satellite views. Search by name or jump to any coordinates. SMART FILTERS Filter by Notable lighthouses (with Wikipedia articles), Heritage-listed sites, or lighthouses with photos. Combine filters with intuitive Venn diagram controls to find exactly what you're looking for. COLOR-CODED PINS Amber for Heritage, Pink for Photos, Blue for Notable, Teal for standard. Instantly see which lighthouses have special significance. BROWSE & DISCOVER Explore by country, light character, range, focal height, or construction material. View pie chart statistics. Try a random lighthouse to discover something new. NEAR ME Find nearby lighthouses sorted by distance. Get driving directions via Apple Maps. Use the live compass radar to see lighthouses around you in real time. PHOTOS & DETAILS Over 5,000 lighthouses include photos. View detailed information including light characteristics, range, height, year built, heritage status, and Wikipedia links. FAVORITES & NOTES Save your favorite lighthouses and add personal notes. Export your favorites as CSV. COMPREHENSIVE DATA Built with data from the NGA List of Lights, US Coast Guard Light List, OpenStreetMap, Wikidata, and GeoNames. Over 32,400 confirmed lighthouses plus 37,000 additional navigation aids. All data is included in the app. No internet connection required for core features. No account needed.
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-maps
@supabase/supabase-js
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.
