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.
London is the most populous city in the United Kingdom
$2.99 · 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.
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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 London: 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 offline access to information
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficult navigation between sections
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalized content
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited user engagement features
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.
London is the most populous city in the United Kingdom. It is the leading global city with strengths in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism and transport all contributing to its preeminence. It is a world cultural capital and the world's most visited city. London also has a diverse range of peoples and cultures. This app is designed specifically to assist visitors navigate around interesting sights within London and its surrounds as well as places of interest. There are 222 sights included in the app with purple pin-drops showing their locations on the map. Once your hotel details are entered, you can easily find what interesting sights are around the hotel you're staying through the map pin-drops. The app also allows you to check the weather conditions, send postcards to family and friends, enter your hotel information by keying in the address or obtain from your contacts, visitor information, modes of transport, and restaurants in London. As this app accesses the internet, an internet connection is required for the app to work. Features: Map - The map is mainly centred around London and its surrounds. It uses four coloured pin-drops. Purple pins shows all 222 sights. Red pins shows the location of hotels you've entered, green pins shows the locations that you wish to find, and the blue pin shows your current location. When you are in London, the 'Locate' button will pin-point your current location with a blue pin-drop. There is also a 'Find' button that allows you to find an address or place that you've entered and this location is shown with a green pin-drop. Sights - All 222 sights are listed. When you select a sight, a summary of the sight will be displayed including the address, opening times and entrance fees. You have the option to mark the site as visited or give a rating for the site. You can also visit its website or display its location on a map. Hotels - You can enter the name and address of a hotel or get one from your Contacts. When you press the 'Save' button, the hotel will be shown on the map. This will provide an indication of how far the sights are from your chosen hotel address. More than one hotel addresses may be entered. You can then go back to the Map section to see the locations (shown by red pin-drops) of these hotels. You can also save the hotel details to your contacts. Weather - This website shows the 5-day forecast on the current weather conditions in London. Postcard - You can send a postcard to your loved ones or friends with an attached photo of the sight you're visiting. Select the 'Sight' photo to send, enter the email address, type your email message, press either 'Send', 'Cancel', 'Delete Draft' or 'Save Draft'. Transport - Obtain information on buses/trains/trams timetables, fares and tickets, journey planner, using public transport, etc. Places - Shows the nearest location of places like restaurants, supermarket, banks, medical centres, etc. on the map based on your current location. It also shows driving direction or walk direction on the map between your current location and the selected place. Directions - This takes you to a website where you can obtain directions (by car, bus, walk, or cycle) to where you want to go. It will initially show your current location. Visitor Information - Obtain information on events, things to see and do, shops, food, etc. Restaurants - Find restaurants by cuisine, landmarks, cities, etc.
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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.