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.
Take the window seat.
$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.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
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 I Call Window Seat - Trains: map the core Entertainment workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Take the window seat. The curtains part, the platform slides away, and an hour-long journey rolls past: rice valleys and cedar hills, Alpine passes and lake shores, sea cliffs and olive groves, high plains under a big sky, the tides of the St. Lawrence, palms and paddy on India's west coast. When the train pulls into the station, the next journey departs. It's a living world, not a video. Every journey is built as the train moves, a stretch of track at a time: the route, the land, the towns, the weather, the hour of the day. Houses, barns, temples and chalets are drawn from code as they're placed, so no two are quite alike. Windmills turn, laundry ripples in the wind, birds bank over the river, herds lift their heads as you pass. A festival lights up at dusk. A storm rolls off the mountains. Leave it running all day and you won't see the same hour twice. SEVEN RAILWAYS - Japan: rice valleys, onsen towns, cedar hills - The Alps: lake shores, chalets, mountain passes - The Italian Riviera: sea cliffs, olive groves, palazzi - The Colorado Rockies: high plains, ranch country, downtown Denver - Québec: along the St. Lawrence, Québec City to La Malbaie - India: the Konkan coast, Ratnagiri to Goa, past palms and paddy - Lapland: above the Arctic Circle, Abisko to Narvik, past fells, ore trains and the fjord One purchase covers iPhone, iPad, Apple TV and Mac. ON IPHONE AND IPAD - Turn your iPhone on its side for the full view; upright, the curtains open wide. On iPad, any way up, full screen or in a window beside your other apps. - On iPhone Duo, opening the phone parts the curtains: the hinge draws them as you unfold it. Close it and the next railway waits behind the curtain on the cover. - Tilt it and the view shifts like a real window: near fences sweep past while the mountains barely move. Set it down and the view keeps a gentle drift of its own. - Tap to pause, swipe for the next place, or use the arrow keys and Space on a keyboard. In Settings, choose which railways the train visits and set the speed, from 0.5× to 2×. - The screen stays on while it plays, so you can prop it up on a desk or a bedside table. - Kind to OLED screens: nothing stays still. The scenery always rolls past, and the curtains and compartment sway and drift too slowly to notice, so no edge stays on the same pixels. You can also hide them in Settings. - Bring your own soundtrack. I Call Window Seat never interrupts your audio, so play music or a podcast from any app and let the scenery roll. - No account, no ads, no in-app purchases. UNDER THE ENGINE Dozens of regions, hundreds of unique objects, and 400 small stories woven through the journeys: dolphins alongside the train on the Riviera, a Corpus Christi procession in the Alps, Diwali night on the Konkan coast. Depth-sorted 3D and a moving gaze give the view real perspective, and it adapts to your iPhone or iPad to stay smooth.
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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: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor performance
Validate with people who use this workflow before building.
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.
Not assessed in a Build Kit yet.
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.