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.
How's the beach today?
Free · 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 Costa: Playas de Puerto Rico: map the core Weather 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 location accuracy for weather data
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase confusion among users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization for alerts
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Performance issues with radar loading
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.
How's the beach today? Costa gives you an answer, not a spreadsheet. One number from 1 to 100 — the Costa Score — sums up conditions at 110 beaches across Puerto Rico, in 36 municipalities and all six coasts. Underneath it sits everything that built it: currents, surf, wind, water quality, clarity, sargassum, Saharan dust, UV, water temperature, tide and weather. HOW IT WORKS Costa doesn't generate its own data. It reads 17 official sources — the National Weather Service, NOAA, CARICOOS, Puerto Rico's Environmental Quality Board, the San Juan Bay Estuary Program, USF and NOAA CoastWatch satellites, Copernicus CAMS — and turns them into something you can read at a glance. Readings are recalculated every 15 minutes. WHAT YOU GET • A clear verdict on whether it's OK to get in, and why • Rip current advisories, bacteria levels and sargassum, stated plainly • 17 public balnearios and 24 kid-friendly beaches, marked • Filters: best right now, favorites, no sargassum, balnearios, surf • Map, photos and directions • English and Spanish HONEST BY DEFAULT When we don't know something, we say so. If no water sample is taken near a beach, Costa won't show a reassuring green — it says there's no reading. A forecast is never dressed up as an observation. Every reading shows its source and when it was taken. Costa is free, has no ads, and never asks you to create an account. Made in Puerto Rico. Costa is a guidance tool, not a lifeguard service. The ocean changes by the minute. Always follow the flags, the lifeguards, and your own judgment.
Written user reviews are not shown here. Check current App Store reviews >
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.