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
Offender Locator
Top 3 Paid App in US, #1 in Utilities Category (Aug
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
3,943 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 Offender Locator: map the core Utilities 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 advanced filters such as radius and offense type.
Assumption to check: Limited search functionality leads to inaccurate results.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize UI for better readability and navigation.
Assumption to check: User interface may feel cluttered on smaller screens.
Validate with people who use this workflow before building.
Hypothesis 3
Implement caching and indexing for faster queries.
Assumption to check: Growing database may slow down search performance.
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline mode for previously searched offenders.
Assumption to check: No offline access for viewing stored data.
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
Top 3 Paid App in US, #1 in Utilities Category (Aug. 2009) · CNN: "iPhone App Helps Track Sex Offenders" · Today Show, NBC September 4th: "Is Your Family Safe From Sex Offenders" · Fox & Friends FOX: "iPhone App Tracks Sex Predators" · USA Today: "iPhone App Finds Registered Sex Offenders" · ABC News: "Top Selling iPhone App: Offender Locator" · Biz Journal, Wall Street Journal online, Yahoo Finance, Finance AOL, USA Television Network: "ThinAir Wireless Strengthens Partnership with Stop Child Predators" The Offender Locator ® allows anyone living in the United States to view Registered Sex Offenders living in their area. The Offender Locator gives everyone the ability to find out if Registered Sex Offenders live in their area. Knowledge = Safety Purchase the Offender Locator and see if Registered Sex Offenders are living near you, your friends, or any address that you want to check. We compile data from all 50 state's "Registered Offender Databases" so that you have a single source for finding Offenders living anywhere in the United States, no matter where you are, right in the palm of your hand! Our data is updated DAILY with each state offender registry so you always have the most accurate information available. ___________________________________________ FEATURES: · Utilize the GPS function on your iPhone to find registered offenders living near your current location. · View registered offenders who live near your friends by simply selecting a name from your iPhone contact list. · Enter your home address or any address to find registered offenders living in that area. · Enter the name of any registered offender in the U.S. and find out instantly where they reside and offenses committed. · Upload any picture or link URL and find the likelihood that a face in your photo matches any offender in public databases. Harnessing the power of machine learning, this is possible and now available in our app. Once you choose one of the four ways to view registered offenders, the application will compile a list of offenders based on that selection allowing you to view details for each offender including photo and offense. You can then find out how close they live to you or your loved ones using the mapping capabilities of the iPhone. This application is extremely simple to use! Terms of Service: https://offenderapps.com/tos.html Privacy Policy: https://offenderapps.com/privacy.html
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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
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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.
