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.
The Date and Time Calculator Plus is a fast, reliable time calculator built for professionals who need accurate time math without spreadsheets, formulas, or guesswork.
$0.99 · In-app purchases
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 Date & Time Calculator Plus: 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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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: Limited functionality for complex time calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can be cluttered with multiple inputs.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual feedback during calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No option to customize time formats.
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.
The Date and Time Calculator Plus is a fast, reliable time calculator built for professionals who need accurate time math without spreadsheets, formulas, or guesswork. Whether you're calculating work hours, payroll totals, aviation time, or billing logs, this app delivers instant, precise results every time. Stop Making Costly Time Calculation Errors: Manual time math is error-prone. Mixing hours, minutes, seconds, and decimal time often leads to mistakes especially in payroll, overtime, and billing calculations. Time Calculator Plus removes that risk with a purpose-built tool designed exclusively for time calculations. Key Features • Add and subtract time instantly: Calculate hours, minutes, and seconds with professional accuracy. • Convert time formats with ease: Switch between HH:MM, decimal hours, and total minutes in seconds. • Perfect for payroll and billing: Get accurate totals for work hours, overtime, and invoices. • Persistent calculation history: Review and reuse previous calculations without re-entering data. • Clean, calculator-style interface: Designed for speed, clarity, and zero distractions. • Works fully offline: No internet required. No data tracking. Just fast results. Who Is This App For? • Freelancers, contractors, and consultants who bill by time • Payroll and accounting professionals • Aviation and transportation users • Office workers tracking work hours and overtime This app features: • Send your calculations or conversions by email • Universal App (iPhone, iPod Touch, and iPad) • Retina Display graphics • Fast app switching • Automatically Saves Your Inputs • All iPhone are supported • All iPhone screens are supported • Latest version of iOS is supported No network connectivity required.
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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.