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
NY Pay: Salary Calculator
PAY
$4.99 · In-app purchases
PRICE
$4.99
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'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 NY Pay: Salary Calculator: 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
Simplify inputs and provide clear instructions.
Assumption to check: Users often find salary calculators overly complex and confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Include more states and customize deduction rules.
Assumption to check: Limited state options can lead to inaccurate calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a free trial and transparent tiered pricing.
Assumption to check: Many apps lack a free trial or clear pricing structure.
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
PAY. KNOWS YOUR PAYCHECK BETTER THAN YOUR EMPLOYER NYC is the only city in America where five separate tax authorities take a cut of your salary. Pay. calculates every layer instantly, offline, with 2026 official tax tables. FIVE-LAYER TAX BREAKDOWN Federal income tax, FICA, NY State, NYC local tax, and SDI & PFL — calculated separately and combined into one clear number. See exactly where every dollar goes. NYC VS. SUBURBS COMPARISON Thinking of moving to New Jersey, Westchester, or Long Island? See the exact annual and monthly tax savings of dropping the NYC resident surcharge without changing your job. PROMOTION CALCULATOR Got an offer? Enter your new salary and see how much of the raise you actually keep after taxes. The real number — not the headline number. PRE-TAX DEDUCTIONS Model your 401(k), HSA, and other pre-tax contributions to see how they reduce your taxable income across all five layers simultaneously. 2026 TAX TABLES Built on IRS Rev.Proc. 2025-32, NYS Pub. NYS-50-T-NYS(1/26), and NYC Finance IT-201 instructions. Updated for the One Big Beautiful Budget Act brackets. 100% OFFLINE No account. No server. No data ever leaves your device. Your salary stays private. DISCLAIMER Pay. provides estimates for informational purposes only based on publicly available tax data. Results do not constitute tax, legal, or financial advice. Consult a qualified CPA for your specific situation.
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
Zustand
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Firebase
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.
