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
Earthquake - alerts and map
6M downloads worldwide
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
50,662 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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Earthquake - alerts and map: 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
Implement faster push notifications and real-time alerts.
Assumption to check: Delayed notifications for earthquakes
Validate with people who use this workflow before building.
Hypothesis 2
Integrate more global data sources for better coverage.
Assumption to check: Limited geographical coverage
Validate with people who use this workflow before building.
Hypothesis 3
Add educational resources and tips for safety during earthquakes.
Assumption to check: Lack of educational content about earthquakes
Validate with people who use this workflow before building.
Hypothesis 4
Improve UI design to prioritize information and enhance user experience.
Assumption to check: User interface can be cluttered
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
6M downloads worldwide. The most popular Earthquake app for iPhone, iPad and Apple Watch. Updated for iOS 26 with Liquid Glass Get the latest global earthquake data from multiple sources and receive push notification alerts. No ads. Main features: • Rich push notifications as soon as the data becomes available from official sources (you can configure up to four alerts based on location and/or magnitude threshold), or opt-in for preliminary notifications based on user reports (faster) • Multiple sources, including U.S. Geological Survey (USGS), European-Mediterranean Seismological Centre (EMSC), Geoscience Australia, GNS Science (GeoNet), Instituto Geográfico Nacional, Servicio Sismológico Nacional, British Geological Survey, GFZ GEOFON, Natural Resources Canada, NOAA • Map with different-sized, color-coded circles to represent event magnitude and age • Dedicated Stats tab with customizable charts: select insights, tweak their display, and pin them to your dashboard for quick access. • Filter events by region (country, continent) or magnitude • Earthquake catalog covering all regions worldwide, dating back to 1970: search by date, region/country, city or reporting agency • Report felt earthquakes to help the community confirm seismic events in your area • The app analyses user reports to calculate an estimated earthquake location once the event has occurred, pending official confirmation • Timeline view (today, yesterday, previous days) • Detail view for each event, accessible from the map and timeline • Tsunami bulletins powered by NOAA data • Map layers: tectonic plate boundaries, orogens, volcanoes, nuclear power plants, population density • Widgets for your Home Screen and Lock Screen, so the latest seismic data is always at your fingertips • Population and built-up area estimates around each epicenter • Export earthquake data to mapping apps • Social sharing: share event map and data • Reverse geocoding: when a location name is unavailable, it is automatically calculated from GPS coordinates • Critical Alerts support * Haptic feedback, Dynamic Type and improved VoiceOver support • Siri Shortcuts support: "Siri, what are the latest earthquakes in the United States?" Terms of Use (EULA): Apple’s Standard End User License Agreement applies: 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.
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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.
