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.
Finally, a calculator that works the way you think! Ever wonder why your calculator gives you a different answer than you expected? Our app solves that with Dual Calculation Logic:
$2.99 · 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 Calc Tape Calculator Pro: map the core Productivity 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 customization options for tape entries
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of advanced calculation features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No cloud sync for tape entries
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User interface can be cluttered
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.
Finally, a calculator that works the way you think! Ever wonder why your calculator gives you a different answer than you expected? Our app solves that with Dual Calculation Logic: Mode 1: The Math Professor (Smart Mode) – For complex equations, this mode uses the correct mathematical rules, prioritizing multiplication and division (PEMDAS/BODMAS). You get the accurate, scientific result every time. Example: 2+2x2 = 6 Mode 2: The Adding Machine (Normal Mode) – For everyday use, this mode calculates strictly from left to right. If you prefer 2 + 2 before you multiply, this is the mode for you. Example: 2+2x2 = 8 You choose your method. Never get the wrong answer again because of calculation confusion! Simply the best editable tape calculator with history. Prefer a free version with occasional ads? Try Calc Tape Calculator here: https://play.google.com/store/apps/details?id=com.calc.calculator.tapecalculator Calc Tape Calculator Pro is a powerful, precision-driven tool designed for professionals, shoppers, students, and everyday users. It features a multi-line tape interface that lets you view, edit, and print your entire calculation history — no need to start over when you make a mistake. • Unlimited number of entries — enter 8,999+ rows effortlessly • Edit any previous number at any time — click it to enter Edit mode • Press '+' or '=' to exit Edit mode and recalculate instantly • Backspace or CE button corrects mistakes without restarting • Print current calculation or full tape history — perfect for documentation • Print to Thermal Receipt Printer • Share the calculation via WhatsApp • Restore cleared calculations using Retrieve Last option • View tape history anytime — retains up to 75 past sessions • Continue adding entries even after pressing '=' • Choose decimal precision — auto-converts to 2 or 3 decimals on-the-fly • Displays results with localized formats: • USA: 75,125,005.01 • Italy: 75.125.005,01 • France: 75 125 005,01 • India: 7,51,25,005.01 • Supports percent calculations and running totals • Auto-saves progress on exit — stays in memory when needed • Add numbers up to 9,999,999,999,999,999 • Resulting totals up to 99 quadrillion+: 99,631,110,471,113,520.99 Use Calc Tape Calculator while shopping, budgeting, or doing finance — enter prices as you go to stay on track. Tap “View Tape History” to revisit or reuse any of your past calculations. The app shows up to five lines and a separate total for clear readability. Format and precision update instantly based on your Settings — no need to retype. Before leaving negative feedback, please reach out via email — I’m happy to help solve any issues! Whether you're planning expenses or crunching massive numbers, Calc Tape Calculator Pro gives you full control over your calculations.
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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.