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.
Travel confidently around London with Transport for London's official app, built around our iconic live Tube map
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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 TfL Go: Plan, Pay, Travel: map the core Navigation 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 functionality in navigation apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Confusing user interface for new users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Frequent crashes or slow performance
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be unclear
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.
Travel confidently around London with Transport for London's official app, built around our iconic live Tube map. Try switching to step-free mode and watch the map adjust to show only accessible stations, ensuring your journeys are as smooth as possible. With a clear, user-friendly design, TfL Go is easy for everyone to use. Find the Best Route We'll suggest multiple ways to get to your destination, whether by Tube, London Overground, Elizabeth line, DLR, Tram, National Rail, London Cable Car, or even cycling and walking. You choose the route that suits you best. Check Before You Travel Get live arrival times for Buses, Tube, London Overground, Elizabeth Line, DLR, Tram, and National Rail. Check the live status of all TfL lines and stations directly on the map, or view a summary of current disruptions in the "Status" section. Freedom to Explore Find travel options tailored to your needs, including step-free journeys and routes avoiding stairs or escalators. Journey plans automatically adapt to the accessibility status of stations, helping you avoid disruptions. TfL Go also supports VoiceOver and Dynamic Type, making it more accessible for everyone. Manage Your Payments Create an account or log in to manage your payments for travel across London. Top up pay as you go credit or purchase Travelcards for your Oyster card, and view your journey history for both Oyster and contactless cards registered to your account. Note: Oyster and contactless accounts can only be accessed within UK/Europe. Understand Station Facilities Check how busy a station is right now, or see if it has toilets or Wi-Fi access. Find detailed information about step-free access and interchanges including platform gap width, step height and boarding methods available. What People Are Saying: "...a surprisingly phenomenal app for commuters travelling via public transport in London!" "One of the finest transport apps there is, well thought out, well designed and well executed." "The most accurate app in London for bus times" "Fantastic app if only just to have a live Tube map / bus tracker in your pocket at all times!" "TfL Go is your number one stop for live tube and bus arrivals" Get in Touch Any questions, feedback or something we've missed? Email us at [email protected]
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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.