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.
CalculatorBiz is the ultimate business calculator built for today’s high-performing sales professionals, entrepreneurs, and decision-makers
$1.99 · 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 CalculatorBiz: 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 compared to advanced calculator apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of tutorial or help section
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance on older devices
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.
CalculatorBiz is the ultimate business calculator built for today’s high-performing sales professionals, entrepreneurs, and decision-makers. Whether you’re closing deals, evaluating investments, or planning your next big move. No handwritten formulas, no second-guessing. In the middle of a negotiation, you need answers—not spreadsheets. CalculatorBiz delivers instant, accurate results you can trust, every single time. *** Core Features • Cost / Margin / Sell Price: Enter any two, get the third—automatically. • Break-Even Analysis: Enter Fixed Cost, Variable Cost, Quantity, or Selling Price—any three, get the fourth instantly.. • Loan Calculator – compare payments, interest, and terms with ease. • Compound Interest Calculator – investment growth over time, simplified. • Depreciation Calculator – Asset depreciation using multiple methods • Scientific calculator- with 30+ functions and Expression input • Currency converter - instant conversion between currencies *** App Functionalities • Graphic Representation and tables easy to copy and export • Customizable Tax Rate: Add or remove taxes with a single tap. • 1-Tap Tax Add/Subtract • Clean Transaction History + Restore • Backspace key • Tap and hold to copy result in the clipboard • Haptic Feedback • Top of the line design with multiple skins • In-App User Guide – learn features quickly, right inside the app. • Localized in Arabic, German, Spanish, French, Japanese, Portuguese, Russian, Chinese (Simplified) *** Why CalculatorBiz? Because in business, mistakes are costly. With CalculatorBiz, you’ll always be ready—with clear numbers, smart insights, and zero distractions. No ads. No clutter. Just pure business efficiency. Upgrade your business game today with CalculatorBiz.
Written user reviews are not shown here. Check current App Store reviews >
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.