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.
Programmer Calc is a powerful calculator designed for developers, engineers, and computer science enthusiasts
$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 BinaryHexCalc: map the core Developer Tools 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 features for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No history of past calculations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of tutorial or help section
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.
Programmer Calc is a powerful calculator designed for developers, engineers, and computer science enthusiasts. Instantly convert between hexadecimal, decimal, and binary number systems, and perform advanced bitwise operations with ease. Key Features: - Multi-base support: HEX, DEC, BIN - Real-time conversion as you type - Interactive 64-bit Bit-Set panel for granular control - Bitwise operations: AND, OR, XOR, NOT, shifts, two’s complement - Mask & Copy: Highlight and copy masked values for any data type - Paste support: Long-press to paste values into any field - Equation history tracking - Square root and modulo operations - ntuitive UI with dark/light mode - Rate and feedback options The dashboard provides a single location to input and convert values among hexadecimal, decimal, and binary representations. Long-pressing any field pastes a number directly into the corresponding system for rapid entry. The Bit-Set panel offers granular control over every bit, updating all number formats immediately after each toggle. Multiplying values that exceed 64 bits returns 1, and square roots are rounded up to the nearest integer (for example, √15 becomes 4). The Mask & Copy feature highlights the bits for the selected data type and copies the masked value to the clipboard in one step, ensuring consistent data sharing. Whether you’re debugging, reverse engineering, or learning about binary math, Programmer Calc is your essential toolkit.
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.