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: Tracker & Alerts
Real-time earthquake alerts from USGS & EMSC — delivered straight to your phone
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.7
190 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.
Build your own version
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 Earthquake: Tracker & Alerts: 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 set alerts based on various parameters like time frame and magnitude range.
Assumption to check: Limited alert customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time data fetching for a more reliable experience.
Assumption to check: Inconsistent data update frequency
Validate with people who use this workflow before building.
Hypothesis 3
Include a history feature for users to view past earthquakes.
Assumption to check: Lack of detailed historical data
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the UI design for better user experience and usability.
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
Real-time earthquake alerts from USGS & EMSC — delivered straight to your phone. Earthquake: Tracker & Alerts monitors seismic activity worldwide with customizable push notifications, an interactive map, and a built-in Emergency SOS feature. REAL-TIME EARTHQUAKE DATA • Browse earthquakes worldwide in a timeline or on an interactive map • Color-coded markers by magnitude for quick visual assessment • Filter by magnitude (2.5+ or 4.0+) and data source • Detailed info for each event: magnitude, depth, location, time, and distance from you SMART NOTIFICATIONS • Receive push alerts when earthquakes happen near you • Customize your magnitude threshold (2.0 – 6.0) • Set your preferred monitoring radius (up to 1000 km) • Never miss a significant event in your region EMERGENCY SOS • Add emergency contacts from your phonebook • One-tap "I'M SAFE" or "I'M IN DANGER" alerts sent via SMS • Automatically share your location and address with loved ones • Built-in flashlight and alarm for emergencies TRUSTED DATA SOURCES • U.S. Geological Survey (USGS) • European-Mediterranean Seismological Centre (EMSC) 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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-native-maps
@react-navigation/native
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.
