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
Wire Gauge Calculator: Cable
Design reliable 12V DC systems with ease
$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 included15 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 Wire Gauge Calculator: Cable: map the core Utilities 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
Add features like voltage drop or load calculation.
Assumption to check: Limited functionality for advanced electrical calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to save previous calculations.
Assumption to check: No history tracking for past calculations
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI using modern design principles.
Assumption to check: User interface may not be visually appealing
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to switch between metric and imperial units.
Assumption to check: No unit conversion 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
Design reliable 12V DC systems with ease Cable empowers you to construct effective power systems for RVs, vans, boats, cabins, and custom setups. Add components like loads, batteries, chargers, and solar panels, ensuring every cable and fuse is perfectly sized — in AWG or metric. Assess performance and safety thoroughly before installation. Intelligent electrical design for mobile power - Ensure optimal fuse and cable sizing with voltage drop analysis - Model comprehensive systems including loads, chargers, batteries, and solar - Get accurate runtime and charging time predictions - Receive system health checks with clear alerts - Automatically generate a detailed Bill of Materials - Operates offline for convenient field use Designed for creators and installers - Ideal for van and RV conversions - Suitable for marine and off-grid systems - Perfect for workshops, service technicians, and knowledgeable builders Cable simplifies electrical design with intuitive visuals and a guided workflow, applying rigorous engineering principles in the background. Build safer, build smarter
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
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.
