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 PRO
The Recipe Scaling & Ingredient Conversion Calculator
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
189 ratings · Top 30%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 PRO: 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.
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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
Expand measurement options to include more units.
Assumption to check: Limited measurement types compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize and save their own recipes.
Assumption to check: Lack of user customization for recipes
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline capabilities for conversions.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription benefits and simplify the purchase process.
Assumption to check: In-app purchase confusion regarding features
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 Recipe Scaling & Ingredient Conversion Calculator Stop struggling with recipe math. Kitchen Calculator PRO helps home cooks and bakers quickly scale recipes, convert measurements, and accurately convert ingredients between cups, grams, ounces, tablespoons, and more. Whether you’re doubling a cake recipe, cutting a recipe in half, or converting flour from cups to grams, Kitchen Calculator PRO does the math for you. FEATURES • Scale recipes instantly using fractions • Convert ingredients between weight and volume measurements, including cups, grams, ounces, tablespoons, teaspoons, and more • Convert cups to grams and grams to cups using ingredient-specific conversion data • Save custom ingredients for even more accurate conversions • Convert volume, weight, temperature, and distance measurements • Enter amounts and view results using standard cooking fractions (1/2, 1/3, 3/4, etc.) RECIPE SCALING MADE EASY Quickly scale recipes up or down without reaching for a calculator. Whether you’re cooking for one person or feeding a crowd, Kitchen Calculator PRO makes doubling, halving, multiplying, and dividing recipe quantities fast and simple. INGREDIENT-BASED CONVERSIONS Not all ingredients weigh the same. A cup of flour weighs differently than a cup of sugar, rice, oats, or cocoa powder. Accurate conversions require knowing the ingredient being measured. Kitchen Calculator PRO includes a database of common ingredients and allows you to save your own ingredient data for even greater accuracy. BUILD YOUR OWN INGREDIENT LIBRARY Need precise conversions for your favorite brands or recipes? Save custom ingredient weights and densities, including values from nutrition labels. Kitchen Calculator PRO remembers your ingredients so future conversions are fast, accurate, and effortless. PERFECT FOR • Home cooks • Bakers • Recipe creators • Culinary students • Anyone working with US and metric recipes Make recipe math effortless with Kitchen Calculator PRO.
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
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.
