App Overview

Cook Units icon

Cook Units

Didier Burton · Food & Drink

You need 200g of sugar but you don’t have a scale—just a measuring cup?

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
2 ratings · Top 5%

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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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Cook Units: 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 range of units and categories for conversions.

Assumption to check: Limited unit options for conversion

Validate with people who use this workflow before building.

Hypothesis 2

Implement user accounts for saving frequently used conversions.

Assumption to check: No user account for saving favorites

Validate with people who use this workflow before building.

Hypothesis 3

Clarify the benefits of in-app purchases within the app.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

Hypothesis 4

Add offline capability for conversions without internet.

Assumption to check: Lack of offline functionality

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

You need 200g of sugar but you don’t have a scale—just a measuring cup? You need 1.5 tbsp of baking powder, but you only have a scale? You need to know how many strawberries you can expect in a 250g container? You need to cook for 7 people, but your recipe is for 2 servings? You need to mark your recipe ingredients as you’re cooking? You need to share your favorite recipes with friends? We got you covered! Cook Units is a measure converter for cooking ingredients designed with usability in a kitchen context. It features a growing set of 1,220+ ingredients with images, and a recipe manager. It works great in light or dark mode, portrait/landscape mode, and in iPad’s Split View/Slide Over layouts. The app can switch between 5 languages (English, French, Japanese, Italian, and Spanish) without changing the language of the device. CONVERT QUANTITIES Conversions of measures can be carried out between weight and volume (e.g. grams to/from cups) and displayed with fractions. Units of measurement automatically adjust to the order of magnitude of the quantities being measured. For example: 8 tbsp (tablespoons) will also show as ½ c (cup,) and 1,000 g (grams) will be displayed as 1 kg (kilogram.) While calculations are exact between weight units or volume units and displayed with up to 2 decimals, they are approximated across weight/volume—depending on an average volumetric mass for the measured ingredient. Conversions also make reasonable approximations in order to display closest fractions, when applicable. CREATE / SHARE / RECEIVE RECIPES Ingredients are browsable as a cover flow, grid, or searchable tagged list. Measured ingredients can be assembled into a recipe with an associated number of servings. Recipes live in iCloud when your account is connected, and so they will appear on any device connected to the same account. Recipes can be associated with notes, locked to avoid mishaps, and shared via Messages, email, AirDrop, etc. in (filtered) bulk or individually. You can also send them to yourself to create backups. ENJOY COOKING! Adjust the number of servings for your recipe and the quantities will automatically resize accordingly with appropriate measuring units. Mark the ingredients in your recipes as you are cooking or shopping for groceries. Just tap a recipe ingredient to see its equivalent measures in weight and volume on the fly. Happy Cooking!

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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
Axios
React Native Paper
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.