App Overview

Calc VAT – UK VAT Calculator icon

Calc VAT – UK VAT Calculator

Aaron Wardle · Business

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

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.4
5 ratings · Below Average

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.

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

Screen plan

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.

Differentiate and validate

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

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

Include more calculation options like reverse VAT and custom rates.

Assumption to check: Limited features for VAT calculations.

Validate with people who use this workflow before building.

Hypothesis 2

Enhance the UI with modern design and animations.

Assumption to check: User interface is not very engaging.

Validate with people who use this workflow before building.

Hypothesis 3

Implement thorough testing to ensure a bug-free experience.

Assumption to check: Low rating due to bugs.

Validate with people who use this workflow before building.

Hypothesis 4

Add functionality to save and retrieve calculation history.

Assumption to check: No data persistence for history.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

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.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Starter

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.