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.
Finally understand the temperature scale you didn't grow up with.
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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 CelsiusFahrenheit: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Finally understand the temperature scale you didn't grow up with. CelsiusFahrenheit shows your local temperature in both units at once — on your Home Screen and Lock Screen. No tapping, no converting, no math. Just glance and learn. 5-DAY FORECAST IN BOTH UNITS See the next five days with every high and low in Celsius and Fahrenheit together. In the app, each day gets a range bar so you can see at a glance how warm the week is running. On your Home Screen, the forecast widget lines up all five days, and you choose which unit leads. Widget backgrounds show a photo of your city from Unsplash that changes daily, so it feels native to wherever you are. Whether you're an American trying to make sense of a 22°C forecast or a visitor staring down 87°F, the answer is always one widget away. WIDGETS INCLUDED - Small Home Screen widget — primary unit large, secondary unit below - Medium Home Screen widget — both units side by side at full size - 5-Day Forecast widget (medium) — daily highs and lows in both units, plus the current temperature - Lock Screen circular widget — both readings stacked in the corner - Lock Screen rectangular widget — location name + both readings Choose Celsius-primary or Fahrenheit-primary depending on which unit you're learning. On the forecast widget, touch and hold, tap Edit Widget, and pick the unit that leads — or leave it on Automatic to follow your device. Your current city is detected automatically. IN THE APP - Current temperature in both units over a photo of your city - 5-day forecast with highs, lows and conditions in both units - Convert any temperature between Celsius and Fahrenheit, with fun facts along the way - Always fresh: opening the app or tapping a widget fetches the latest data, and you can pull down to refresh any time HOW IT WORKS Temperature and forecast data come from Open-Meteo, a free and accurate weather service. City background photos are sourced from Unsplash with full photographer attribution. Your location is used only to request local weather and a photo of your city — the app never stores it, and there are no accounts, ads or tracking. Can be used as a widget on visionOS! A mnemonic to get you started: "Thirty is hot, twenty is nice, ten is cool, zero is ice."
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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 customization for weather notifications
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of detailed weather maps
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No integration with smart devices or wearables
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Basic user interface lacks engagement
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.
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.