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.
Work out your lease instalment in seconds — and see exactly where it comes from.
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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 Leasing Calculators: map the core Finance 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: Users find it hard to accurately input leasing terms
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of visual representations for calculations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited customization options for calculations
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.
Work out your lease instalment in seconds — and see exactly where it comes from. Enter the value of the asset, add the down payment and the final buyout if your contract has them, set the term and the rate: the instalment appears as you type, together with the total cost and the interest. • THE INSTALMENT, IN ADVANCE OR IN ARREARS Choose whether payments fall at the start or the end of each period. A bar shows how the total cost splits between down payment, instalments and buyout. • THE FULL SCHEDULE Every instalment with its due date, principal, interest and outstanding balance — the down payment first, the buyout last. Export it as CSV for your spreadsheet, or as a print-ready PDF. • THE COMPARISON How much is a bigger down payment worth? And what does a bigger buyout really cost? The app lays out five scenarios for each lever, showing the instalment and the total cost side by side. This is where the trade-off becomes visible: a bigger buyout lowers the instalment but raises what you pay overall. • REAL DATES Set the date of the first instalment and the schedule follows your contract's actual due dates. Everything is calculated on your device. No account, no sign-up, nothing sent anywhere. No advertising of any kind. The figures estimate the financial component: a real contract may include fees, insurance and taxes that this app does not calculate.
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.