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 °
Headline:
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
Preview a sample Build Kit No email needed
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 °: map the core Productivity 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 advanced features like historical analysis or comparisons.
Assumption to check: Limited functionality beyond basic calculations
Validate with people who use this workflow before building.
Hypothesis 2
Include themes or font size adjustments.
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Implement a sharing feature for results via social media or messaging.
Assumption to check: No sharing capabilities for results
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
Headline: The essential toolbox for electricians and engineers. Instant AWG conversions, NEC reference, and Voltage Drop calculations. Body: Wire Gauge Calculator ° is a professional-grade utility designed for electricians, engineers, and DIY enthusiasts. Upgrade your workflow with a fast, modern, and offline-capable tool that replaces cumbersome charts and manual formulas. Whether you are sizing wire for a home renovation, checking a long cable run for voltage drop, or converting AWG to metric, this app provides instant answers based on standard electrical codes. KEY FEATURES: Professional AWG Tool Instant Reference: Scroll through standard sizes from 18 AWG to 4/0 AWG. Metric Conversion: Automatically converts AWG to Diameter (mm) and Area (mm²). Max Load Capacity: Built-in ampacity lookup based on NEC Table 310.16 (Copper, 75°C). No internet required. Voltage Drop Calculator (New in v1.1) Ensure your electrical runs are safe and compliant. NEC Compliance: Automatically alerts you if voltage drop exceeds the recommended 3% limit (Green/Red status indicators). Flexible Inputs: Quick-fill buttons for standard voltages (12V, 24V, 120V, 240V) or enter custom system voltages. Dual Units: Support for both Feet and Meters length inputs. Precise Formula: Uses standard resistance formulas (Copper) to calculate exact Voltage Drop (V) and Percentage (%). Built for iOS Clean Interface: Native SwiftUI design that is fast and responsive. Haptic Feedback: Feel the confirmation when calculations complete. Privacy First: No data collection, no ads, works 100% offline. Perfect for: Residential & Commercial Electricians Automotive & RV Wiring (12V/24V systems) Solar Power System Design Home Improvement & DIY Projects Stop guessing wire sizes. Download Wire Gauge Calculator ° today and work with confidence.
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-native-paper
react-native-gesture-handler
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.
