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.
HourlyTax helps hourly workers and freelancers track their hours and estimate their taxes instantly — no account, no sign-up, no personal data collected
$9.99
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for HourlyTax: Pay 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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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
Assumption to check: Lack of personalization for different professions
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No historical data tracking
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited user engagement
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
HourlyTax helps hourly workers and freelancers track their hours and estimate their taxes instantly — no account, no sign-up, no personal data collected. Everything runs on your device. WHETHER YOU'RE A W-2 EMPLOYEE OR 1099 CONTRACTOR HourlyTax calculates your federal income tax, self-employment tax, and state income tax for all 50 states in real time — without sending a single byte to any server. HOURLY PAY TRACKER Log your work hours daily with a simple tap. Set your hourly rate and see your gross pay calculated instantly. TAX ESTIMATOR FOR FREELANCERS & GIG WORKERS Know exactly how much to set aside for taxes every week. HourlyTax estimates your federal and state tax burden based on your income, filing status, and state of residence. SELF-EMPLOYMENT TAX CALCULATOR 1099 workers see a full breakdown: federal income tax, self-employment tax (SE Tax), and quarterly estimated payments — all in one screen. W-2 PAYCHECK ESTIMATOR Employees get a clear picture of their take-home pay after federal and state withholding estimates. ALL 50 STATES SUPPORTED From California's top rate to zero-tax states like Florida and Texas — HourlyTax uses 2026 IRS-verified tax brackets for every state. PAY HISTORY & REPORTS Track your earnings by week, biweekly, or monthly. See your full tax breakdown for any period at a glance. 100% PRIVATE — WORKS OFFLINE No account. No sign-up. No ads. No tracking. No internet required. Your salary, hours, and tax data never leave your phone — ever. BILINGUAL — ENGLISH & ESPAÑOL Built for the US Hispanic workforce. Switch between English and Spanish at any time. 2026 TAX BRACKETS INCLUDED Updated with the latest IRS rates, standard deductions, and Social Security wage base for tax year 2026. For informational and estimation purposes only. Does not constitute legal, tax, or financial advice.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.