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
Freelancer Take-Home Pay
Freelancer Take-Home Pay is a fast, accurate tax calculator designed specifically for US freelancers and independent contractors
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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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Combine features and design from your favorite apps.
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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 Freelancer Take-Home Pay: 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
Include simple guides or tooltips explaining tax categories.
Assumption to check: Users find tax calculations confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Add options for various income sources (e.g., contracts, hourly rates).
Assumption to check: Limited functionality for different income types.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to save preferences and customize their experience.
Assumption to check: Lack of personalization in settings.
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
Freelancer Take-Home Pay is a fast, accurate tax calculator designed specifically for US freelancers and independent contractors. Get instant estimates of your take-home pay after federal income tax, self-employment tax, and state income tax. Features: - Calculate take-home pay based on annual income - Tax calculations for all 50 states and Washington DC - Federal tax brackets for 2025 and 2026 - Self-employment tax (Social Security + Medicare) - Filing status options (Single, Married Filing Jointly) - Detailed tax breakdown showing each tax component Comprehensive FAQ with tax explanations - All calculations done locally on your device—no data collection Perfect for: - Freelancers estimating quarterly taxes - Independent contractors planning income - Gig workers understanding tax obligations - Anyone wanting a quick tax estimate *All numbers are estimates. Not tax advice. Consult a tax professional for accurate tax planning.* Designed for US freelancers and independent contractors. US tax rules only.
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.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
axios
react-native-picker-select
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.
