App Overview

Withholding Calc icon

Withholding Calc

3 Dogs and a Cat Software, LLC · Finance

Tax time is coming again! Will you be ready for it?

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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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What's included16 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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Withholding Calc: 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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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

Provide a guided experience with tooltips and explanations for each input.

Assumption to check: Users often find tax calculation apps confusing and not user-friendly.

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to save and edit multiple scenarios.

Assumption to check: Lack of customization options for tax scenarios.

Validate with people who use this workflow before building.

Hypothesis 3

Incorporate charts and graphs for better understanding of withholding amounts.

Assumption to check: Limited visual representation of results.

Validate with people who use this workflow before building.

Hypothesis 4

Make subscription benefits and features more transparent and visible.

Assumption to check: In-app purchases can be unclear.

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

Tax time is coming again! Will you be ready for it? WithholdingCalc is an ad-free estimator for your pay check. Input your pay check gross pay, pre-tax deductions (insurance, 401k, etc.), filing status, state, and withholding allowances from your W-4 and get an estimate of how much of each of your pay checks is going to the government, and how much is going into your pocket. You can see how to optimize your monthly budget and make sure you've had enough taxes held back for tax time! Want to get even more advanced? Switch over to the advanced view and you can enter extra withholding amounts for both Federal and State taxes, and separate filing status and withholding allowance amounts for your state to get an even more accurate picture of your tax withholding. WithholdingCalc lets you easily manipulate the numbers from your W-4 form to help you get an accurate picture of your budget and how much tax withholding you will have accumulated for tax season. WithholdingCalc is based on current 2018 tax rates for most federal and state tax rates for the 41 states that have income tax plus the District of Columbia and Puerto Rico. We will update Withholding Calc as further tax rate changes come in. WithholdingCalc uses an annualized method for computing taxes for most jurisdictions. This means that the total tax withholding that it computes may be slightly different from what your employer computes. Generally the two numbers will agree to within a few cents. If they don't, please use our contact form to let us know and we'll investigate it! With the updates some of the 2018 tax brackets now in place, we'll be adding in some of the features we've been working on, like the option to compute your pay check based on an hourly pay rate (with or without overtime pay), calculations for places where there are local taxes as well as state taxes, and more accurate options for states like Arizona which use flat percentage options for withholding instead of a withholding allowance amount. The 2018 IRS tax brackets aren't available yet, but we'll be adding them as soon as they are. WithholdingCalc is not endorsed by any taxing authority, including the Department of the Treasury or the Internal Revenue Service (They want you to give them too much money :) ).

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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.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
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BUILD KIT DIFFICULTY
Intermediate

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.