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 & Tracker
Earthquake+ keeps you informed when seismic and volcanic activity occurs.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
22,124 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 Earthquake+ Alerts & 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
Implement more granular alert settings and real-time notifications for users.
Assumption to check: Limited real-time alerts can miss significant events
Validate with people who use this workflow before building.
Hypothesis 2
Design a cleaner, more organized UI layout with better information hierarchy.
Assumption to check: Interface can feel cluttered with too much information
Validate with people who use this workflow before building.
Hypothesis 3
Add features for user reports and community discussions on earthquake events.
Assumption to check: Lack of community feedback features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize map performance and offer a low-power mode for extended use.
Assumption to check: App can drain battery quickly due to map interactions
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
Earthquake+ keeps you informed when seismic and volcanic activity occurs. See what’s happening around you and worldwide with fast, reliable data from over 30 trusted sources, including USGS, EMSC, and the Smithsonian Institution. Track earthquakes, tsunamis, and volcanic activity with powerful maps, alerts, and real-time updates. =================================== FREE VERSION: =================================== - Receive real-time earthquake alerts for up to 20 locations. - See the latest earthquakes and volcanic activity worldwide and near you. - View recent events, seismic time-lapses, and weekly summaries. - Get real-time updates on volcanic eruptions. - Receive tsunami warnings when risk is detected. - Customise maps, alerts, lists, and filters. - Explore earthquake history (since 2010) with tectonic and fault data. - Save favourite events and search locations easily. - Share updates via SMS, email, or Facebook. - Access daily summaries through the Home or Today widget. - Visualise data with multiple map layers. - Customise alert sounds so you never miss an event. - Stay informed about air travel disruptions from volcanic activity. =================================== PREMIUM SUBSCRIPTION: =================================== - Unlock advanced features for deeper insights and control - Remove all advertisements - Customise alerts with advanced filters and sound options - View earthquakes in 3D with additional map layers - Assess impact instantly with ShakeMap - Track volcanic ash clouds in real time - Create animations of earthquake activity =================================== SUBSCRIPTION INFO: =================================== We offer an auto-renewable Earthquake+ subscription that provides access to Premium features. Payment will be charged to your iTunes account at confirmation of purchase. Subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage subscriptions and turn off auto-renewal in your App Store account settings. Any unused portion of a free trial period will be forfeited when a subscription is purchased. Terms of Use: http://earthquakesapp.com/terms.html
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
Zustand
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.
