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.
•• The top paid earthquake app for 10 years.
$0.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for QuakeWatch: map the core News workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited customization for alerts
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Outdated data in some regions
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No user feedback mechanism
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
•• The top paid earthquake app for 10 years. •• A #1 News app in 60 countries so far including the US, UK, and Canada. •• An App Store Top 100 app in 40 countries so far including the US and Canada. •• Written-up in USA Today. •• Shown and discussed on CNN Newsroom. QuakeWatch has been the most popular paid earthquake app in the App Store for over 10 years now -- used by schools, relief agencies, media outlets, and thousands of people around the world curious about earthquakes near to them, family, or friends. It has reached the App Store Top 100, and #1 in News, multiple times. It is a feature-rich reference guide, free of ads, of the latest magnitude 1.0 and larger earthquakes from around the world as provided by ten worldwide sources including the US Geological Survey and the European-Mediterranean Seismological Centre. Find out when they happened, where they happened, how big they were, and more. All in an easy-to-use interface without losing space to banner ads! The key features of QuakeWatch include: • An interactive world map view with tectonic plates showing reported earthquakes over the past week. Pan and zoom the map to focus on hot spots and click the details button to see the quake report. Also the ability to replay the earthquakes in order. • Sort the listing by the most recent earthquakes. • Sort by the largest earthquakes over the past week. • Sort by the closest earthquakes to your location and see the distance and direction from your position. • Sort by earthquakes nearest to a place anywhere on the earth that you easily specify. Great for tracking quakes near family members. Shows the distance and bearing from them. • Choose from reporting services in the US, Europe, Canada, Mexico, UK, Australia, New Zealand, Germany, Iceland, and Italy. • Select the tsunami icon in the toolbar for quick access to the latest tsunami information for the Pacific, US West Coast & Alaska, Australia, and Japan. • Send earthquake information to yourself or others through email, Twitter, Facebook, or SMS text messaging. • Filter out smaller earthquakes from the list by setting the minimum shown to be between 1.0 and 6.0. • Select an earthquake from the list to view more information along with a live map of its location and the ability to show nearby earthquakes. • Selecting the blue additional details button will take you to the reporting web site integrated into the application for more information about the earthquake which may include distances from cities, historical maps, shake maps, etc., and then easily return to the list. • Universal app - supports the iPad, iPhone, and iPod touch. • Supports quick view multitasking on the iPad on iOS 10 and newer. • iPod touch and iPad WiFi users can manually specify their current location if greater accuracy is needed. • The ability to define local earthquakes within a radius of your location. Then sort by "Closest" to see all local earthquakes sorted by distance or the most recent. • Earthquakes within the last 2 hours and within your local range are colored blue for quick identification. • All times are shown in your time zone. • No banner ads.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.