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
Recipe Costing Calculator
The Recipe Costing Calculator allows you to easily and quickly cost your recipes
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
9 ratings · Below Average
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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Recipe Costing 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.
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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
Include detailed ingredient management and pricing history.
Assumption to check: Limited functionality for ingredient tracking
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to categorize and tag recipes for easier searching.
Assumption to check: Lack of customization options for recipes
Validate with people who use this workflow before building.
Hypothesis 3
Implement an onboarding tutorial to guide first-time users.
Assumption to check: Poor user reviews indicating confusion
Validate with people who use this workflow before building.
Hypothesis 4
Provide more free features to enhance user retention and satisfaction.
Assumption to check: In-app purchases for basic 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 Costing Calculator allows you to easily and quickly cost your recipes. You enter your ingredients, and the amount you pay for them, and then you enter your recipe and it will tell you how much it will cost to make the whole thing, and how much per portion. You can also store the instructions on how to make a recipe, along with photos, and print them out. The app will take tax into account, and allow the user to enter the margin that they want to make so they know how much they need to charge. Receipts can be printed from the app for sales, as well as printing recipes themselves. The app will take automatically convert between different units of measure so even though your recipe may be in one set of units, and you buy your ingredients in another set it will know what you are spending. The app allows you to keep track of stock, and will enable you to create shopping lists to cook various ingredients based on what you have left in stock and what you want to cook.
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
axios
react-navigation
zustand
Firebase
BUILD KIT DIFFICULTY
Intermediate
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.
