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.
App Overview
FinTax
FinTax is designed to provide payroll withholding tax calculations based on the Australian ATO PAYG tax system for employees.
$18.99 · In-app purchases
PRICE
$18.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for FinTax: 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
Conduct user research to identify key features and improve the app.
Assumption to check: Limited user reviews and feedback on features.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a freemium model to attract more users.
Assumption to check: High upfront cost of $18.99 may deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement in-app support and FAQs.
Assumption to check: Lack of customer support options.
Validate with people who use this workflow before building.
Hypothesis 4
Provide educational resources or guides within the app.
Assumption to check: Complexity in understanding tax regulations.
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
FinTax is designed to provide payroll withholding tax calculations based on the Australian ATO PAYG tax system for employees. All PAYG tax tables from 1996 to the year 2015/2020 are contained and tax can be calculated for income in any of these years. A reverse tax procedure is available. This lets you enter a desired net pay and have FinTax calculate the gross pay and tax that will produce the desired net. HECS/HELP debt and SFSS debt are catered for The tax free exemption (currently $18,200) can be turned off for employees whose pay is not from primary employer. Employees without a tax file number, or who are not Australian residents can also be handled A report on the input screen shows the calculated tax and the effective tax rate based on calculated tax and taxable amount HELP is available from main screen
Written user reviews are not shown here. Check current App Store reviews >
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
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.
