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
Calculadora IGV Sunat
Calculadora IGV Sunat, es una herramienta poderosa y fácil de usar que te permite ahorrar tiempo, evitar errores y tener el control total de tus números.
$1.99 · In-app purchases
PRICE
$1.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 Calculadora IGV Sunat: map the core Finance 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
Provide clear explanations and examples of calculations.
Assumption to check: Users may find it difficult to understand tax calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature for users to track previous calculations.
Assumption to check: Limited functionality with no history tracking.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set preferences, such as default currency and notification settings.
Assumption to check: No user customization options.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a subscription model with a free trial to attract more users.
Assumption to check: Single purchase with no trial or subscription options.
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
Calculadora IGV Sunat, es una herramienta poderosa y fácil de usar que te permite ahorrar tiempo, evitar errores y tener el control total de tus números. Ideal para contadores, emprendedores, independientes y estudiantes. Ya no necesitas hojas de cálculo complicadas ni calculadoras antiguas: todo lo que necesitas está aquí. ¿Qué puedes hacer con esta app? Calcular IGV al instante (18%, 10%, 0% o personalizado). Separa automáticamente el valor neto, el impuesto y el total con solo tocar la pantalla. Visualización inteligente: Edita cualquier campo (neto, IGV o total) y la app calcula el resto al instante. Remuneraciones y beneficios: Calcula CTS, gratificaciones, seguros y más con precisión profesional. Calculadora de UIT: Obtén valores por porcentaje o múltiplos de la Unidad Impositiva Tributaria actualizada. Interfaz moderna, rápida y agradable. Diseñada para que cualquier usuario, sin conocimientos contables, pueda usarla sin complicaciones. Tu tranquilidad financiera empieza con un cálculo correcto. Descarga ahora y lleva el control de tus finanzas en la palma de tu mano.
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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
React Navigation
AsyncStorage
React Native Paper
Zustand
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.
