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.
Locate every site on the Historic England list of historic sites in England!
$1.99 · 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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Generating… usually about a minute.
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 Historic Sites: England: map the core Travel 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 user reviews can lead to trust issues.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulty in finding specific sites can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of in-app communication for bookings can cause confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High competition in the travel app space makes user retention challenging.
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.
Locate every site on the Historic England list of historic sites in England! The Historic England list contains over 379,000 (!) entries, each a site that has been designated as having historic value. That means that no matter where you travel in the country you are almost certainly near one or more sites on the Historic England list. Finding those sites can be difficult! Most are not marked with any kind of signage, and there is no map showing of them. Historic Sites: England solves that problem! Historic Sites: England presents the standard Apple Map, with sites in the Historic England list marked on the map at their location. For any locale you choose or for the area around your current location, you can see what Historic sites are nearby. You can use it in two ways: "Search and Locate" mode: Search for Historic sites by state, by city or by name, or any combination of those three. You'll get a list of all the sites matching your search criteria. From that list you can see more information about a site, or you can tap a site and the map will center itself on the site you selected. "While You're Moving" mode: As you drive or walk, the map will show your current location and any Historic Sites in the area. You can zoom the map to cover a small area or larger areas around your current position. In both modes you can see where sites are located on the map, and then see more detailed information about the site by tapping the site's callout balloon. From that information view, you go directly to the Historic England page for the selected site. For each site you can see the Historic England description of the site. For Grade II, this description is truncated keep the size of the database to a level usable on iOS. To see the full description for a Grade II site, you can go from the app to the Historic England page for that site. You can enter. a location (town or country) and the map will move to that location showing sites in the area. You can filter sites, so the map shows only Grade I sites, only Grade II* sites, only Grade II sites or any combination of the three. With your Historic Register Site Finder, you'll be able to locate sites on the United States Historic Register and find them as you travel across the country. Excellent!
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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.