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.
App Overview
Kitchen Calculator
The Fast Cooking Measurement Converter
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.6
20 ratings · Top 50%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Kitchen Calculator: map the core Food & Drink workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Add more units and custom unit options for better user experience.
Assumption to check: Limited unit options for conversion
Validate with people who use this workflow before building.
Hypothesis 2
Expand recipe database and allow user submissions.
Assumption to check: Lack of recipe variety
Validate with people who use this workflow before building.
Hypothesis 3
Implement a modern UI with better visuals and animations.
Assumption to check: User interface feels dated
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to save favorites and access converters offline.
Assumption to check: No offline access
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
The Fast Cooking Measurement Converter Convert cooking measurements quickly and easily using fractions or decimal values. Kitchen Calculator is designed for home cooks and bakers who need fast, accurate kitchen conversions without the hassle of manual calculations. Whether you’re converting teaspoons to tablespoons, ounces to grams, Fahrenheit to Celsius, or adjusting recipe quantities, Kitchen Calculator makes kitchen math simple. FEATURES • Enter and view measurements using standard cooking fractions (1/2, 1/3, 3/4, etc.) • Display results as fractions or decimal values • Supports US, UK, and metric cooking measurements • Convert volume measurements such as teaspoons, tablespoons, cups, pints, quarts, liters, and milliliters • Convert weight measurements including ounces, pounds, grams, and kilograms • Convert temperature measurements including Fahrenheit and Celsius • Convert distance measurements DESIGNED FOR COOKS Unlike generic conversion tools, Kitchen Calculator is built specifically for cooking and baking measurements, making common kitchen conversions fast and easy. Whether you’re following a recipe from another country or adjusting measurements in the kitchen, Kitchen Calculator helps you get the right answer in seconds. NEED CUPS-TO-GRAMS CONVERSIONS? Kitchen Calculator Pro adds ingredient-specific weight and volume conversions, recipe scaling tools, and a customizable ingredient database for accurate cups-to-grams and grams-to-cups conversions.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
React Navigation
React Native Paper
TypeScript
BUILD KIT DIFFICULTY
Starter
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.
