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.
Make your day-to-day calculations quick, easy, and beautiful with Calzy
$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 Calzy: 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 buttons and themes
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of advanced features like scientific calculations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No cloud sync for history and favorites
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases may confuse users
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.
Make your day-to-day calculations quick, easy, and beautiful with Calzy. Whether you're a student, professional, or just looking for a better way to manage your everyday math, Calzy is the perfect solution. With its advanced features and gorgeous design, Calzy will quickly become your go-to calculator. One of its standout features is the "Memory Area," where you can store and easily reuse multiple numerical values with just a drag and drop. Another one is the bookmarking feature, allowing you to save any calculation with a title for future reference. Using the latest iOS technology, like Live Activity, Drag and Drop, Haptic Touch, Face ID, and more, Calzy makes mathematical problem-solving a seamless experience. And with privacy being our top concern, rest assured your data stays with you. Key Features: • Memory Area for saving and reusing numerical values • Basic and advanced modes • History and Bookmarking with privacy mode (Face ID support) • Clean, modern, and beautiful design • Privacy-conscious app • Multitasking with slide-over and split view for iPad • Haptic Feedback for a more immersive experience • Tax + and Tax - functions • Quick toggle for decimal and currency rounding • Smart parenthesis • Today widget and iMessage extension • Ability to edit keypad layout • Apple Pencil 2 support and external keyboard support • Dynamic type support for enhanced readability • Custom App Icon support for a personalized touch • Universal app for iPhone, Apple Watch, and iPad • Handoff support, start on one device and resume on another • iCloud sync • Dark and Light modes with multiple color accents • Regional support for countries using decimal commas • Instant calculations as you type • Bookmarks are available in the Spotlight search • Universal purchase for all your devices • Family Sharing support • Localized in Chinese, Japanese, French, Italian, Russian and German Powered by the latest iOS technology, Calzy is the calculator for the new age.
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.