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
America's Lighthouses
The America’s Lighthouses App is an indispensable companion for anyone that loves lighthouses
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
75 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 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 America's Lighthouses: 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
Provide detailed descriptions and historical context for each lighthouse.
Assumption to check: Limited information on some lighthouses
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline caching for lighthouse data.
Assumption to check: No offline access to information
Validate with people who use this workflow before building.
Hypothesis 3
Clarify in-app purchase benefits and simplify access.
Assumption to check: In-app purchases for additional features can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to submit reviews and share their experiences.
Assumption to check: Lack of user-generated content or reviews
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
The America’s Lighthouses App is an indispensable companion for anyone that loves lighthouses. If you travel the country visiting, climbing, photographing and even painting these historical American monuments, you’ll love America’s Lighthouses! Documenting the over 800 lighthouses, along the Atlantic, Pacific, Great Lakes, Gulf coasts and even inland waterways . . . The America’s Lighthouses App is the perfect guide for the dedicated lighthouse explorer. Follow the pulsing blue dot as you navigate your way from lighthouse to lighthouse. Tap on the GPS linked icons and review on-line reference material on each building. Would you like to know how to get Portland Headlight? Want to know when Cape Hatteras Lighthouse was built? Which lighthouses in the Bay Area you have visited and when? America’s Lighthouses App should be on your mobile device. Every lighthouse has exact GPS coordinates and can be viewed using built in Satellite Maps, navigation guides, and personal notes. The America’s Lighthouses App will make your next Lighthouse excursion more informative and enjoyable.
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
Zustand
axios
react-navigation
react-native-image-gallery
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.
