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
COOK OBSESSION CALCULATOR
COOK OBSESSION CALCULATOR es la herramienta de precisión para quienes quieren cocinar arroces secos controlando cada variable: desde la evaporación a los grados Brix.
$12.99 · In-app purchases
PRICE
$12.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for COOK OBSESSION 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
Implement precise algorithms and user feedback for adjustments.
Assumption to check: Users often find measurement conversion apps lack accuracy.
Validate with people who use this workflow before building.
Hypothesis 2
Add a robust database for common substitutions.
Assumption to check: Limited functionality for ingredient substitutions.
Validate with people who use this workflow before building.
Hypothesis 3
Design a clean and user-friendly interface with intuitive navigation.
Assumption to check: Poor user interface can make navigation difficult.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate a favorites system and recipe sharing options.
Assumption to check: Lack of user engagement features like saving favorites.
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
COOK OBSESSION CALCULATOR es la herramienta de precisión para quienes quieren cocinar arroces secos controlando cada variable: desde la evaporación a los grados Brix. Desarrollada por Félix Vallugera —Premio Wikipaella a la Innovación 2022 y autor de "Arroces de Precisión"—, la app simplifica los cálculos de las metodologías desarrolladas por el autor. QUÉ HACE: Calcula la cantidad exacta de caldo según tus paellas, cantidad de arroz, paellero y tiempo. Calcula la cantidad de arroz, grasa y sal a partir del diámetro de tu recipiente. Memoriza los resultados de tus paellas y nómbralos como quieras para poder usarlos en el futuro. Registra el peso de tus ollas para cálculos instantáneos. Ajusta los grados Brix en función de tus necesidades. IMPORTANTE: Esta app da por conocidas las metodologías de cocción que hay detrás de los cálculos. No es un tutorial sino una potente herramienta de trabajo que simplifica mucho los procesos y evita errores. Si quieres entender el porqué de cada variable (la evaporación, los grados Brix, el socarrat), te recomendamos el libro "Arroces de Precisión" y tanto el "Taller online de arroces secos y capa fina con socarrat" como el "Taller avanzado de caldos". Más información en arrocesdeprecision.com
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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
Supabase
react-navigation
@supabase/supabase-js
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.
