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.
Calc VAT is an easy to use VAT Calculator, designed to make your Value Added Tax calculations much faster than using a traditional calculator
$0.99 · 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.
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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 Calc VAT – UK VAT Calculator: map the core Business 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 features for VAT calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface is not very engaging.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Low rating due to bugs.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No data persistence for history.
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.
Calc VAT is an easy to use VAT Calculator, designed to make your Value Added Tax calculations much faster than using a traditional calculator. Simply enter the amount you wish to calculate in the Input Amount field and select if you want to find out the Inclusive VAT or add VAT to the original amount. Calc VAT will then show you the breakdown of the amount and at any time you can change the VAT rate or inclusive VAT setting and the breakdown will automatically update for you. By default Calc VAT will start up set to add 15% VAT onto any amount you enter. This is the current UK Vat rate, however you can you can set Calc VAT to a different VAT rate such as the reduced rate of 5%. With Calc VAT you can even select any country in Europe and the application will auto load in the standard VAT rates and reduced rates for the selected country. When you close Calc VAT it will remember your preferred VAT rate and Inclusive VAT setting which makes it simpler for the next time you start up Calc VAT. With Calc VAT you will no longer need to try and remember those complicated VAT formulas!! Calc VAT will auto update itself when ever a new VAT rate released or changed, and will even remember your calculations on the history for later use. --- Please let us know what you would like to see in future versions of Calc VAT when writing your review.
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.