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 & Tsunami Alerts
#1 Earthquake app for iPhone and iPad.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.0
45 ratings · Top 30%
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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 & Tsunami 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
Implement real-time push notifications for alerts.
Assumption to check: Difficulty in receiving timely alerts
Validate with people who use this workflow before building.
Hypothesis 2
Enhance map interactivity with better zoom and detail options.
Assumption to check: Limited map features
Validate with people who use this workflow before building.
Hypothesis 3
Use multiple reliable data sources for alerts.
Assumption to check: Inconsistent data accuracy
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI by organizing alerts and warnings more clearly.
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
#1 Earthquake app for iPhone and iPad. This app is brought to you by SMS Tsunami Warning, the award-winning earthquake monitoring app since 2011. The app turns your phone into an alert system for earthquakes and tsunamis. It monitors seismic activity worldwide 24/7 and it delivers an alert to your iOS device if conditions are met (magnitude, user’s distance from quake, etc.). Alerts are delivered as push notifications with a loud siren sound. APP FEATURES - Live earthquake map - Beautiful simple design, easy to use - No ads - Data feeds from various sources - Metrical / Imperial measurement systems - earthquake alerts / tsunami alerts - Loud siren sound - Quake data (location, magnitude, depth, distance, population density nearby, etc.) - Great educational tool - Support for the latest iPhone and iPad models. The user interface is simple and easy to use. For a better reading, the map only shows "significant" earthquakes (with magnitude equal to or bigger than 4.5 on the Richter scale) detected globally in the last 24 hours. In the Settings screen, you can set your parameters for receiving the alerts (ie. user’s distance from the quake’s epicenter and magnitude). After the parameters are set, you can enable (or disable) the alarm system in one touch for total peace of mind. The app supports both metric and imperial measurement systems (Kilometers / Miles) to assess distances. Each quake is represented by a marker on the map. Tap on the marker to open the details panel and dig more into the quake's data (depth, population estimates, etc.). The app is directly connected to our web platform, where you can learn more about a specific seismic event or, in general, get access to a vast literature concerning earthquakes and tsunamis (fault lines, features, history, etc.). The app is a great educational tool and it offers a vital alert service, especially to those living by the coastline or in seismic regions. The app is free and it contains NO ads. Push alerts are offered as in-app purchase for tiny $2.99 yearly fee (it may change slightly based on your country). End User License Agreement (EULA) available here: https://www.sms-tsunami-warning.com/pages/service-terms-mobile
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
zustand
react-native-push-notification
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.
