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
Pool Volume & Size Pro Plus
Designed for pool owners and pros, this all-in-one calculator gives fast, precise water volume for any pool shape—US gallons, imperial, or liters
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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.
Build your own version
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/
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 Pool Volume & Size Pro Plus: 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
Expand options to include custom shapes and pool features
Assumption to check: Limited shapes to calculate volume
Validate with people who use this workflow before building.
Hypothesis 2
Add a visual representation of pool designs
Assumption to check: No visualization of pool dimensions
Validate with people who use this workflow before building.
Hypothesis 3
Include advanced features like chemical dosage and maintenance tips
Assumption to check: Basic calculation features only
Validate with people who use this workflow before building.
Hypothesis 4
Implement user accounts for saving history and preferences across devices
Assumption to check: No user accounts or data sync
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
Designed for pool owners and pros, this all-in-one calculator gives fast, precise water volume for any pool shape—US gallons, imperial, or liters. Built-in converters (length, flow, pressure, temperature) and LSI tools help you size, balance, and manage your pool with confidence. No guesswork—just clean, reliable numbers when you need them. Pool Calculators * Square Pool * Rectangular Pool * Free Form Pool * Circular Pool * Oval Pool * Elliptical Pool * Bean Shaped Pool Included are converters from feet to meters, temperature conversions, pressure units, flow rate, gallons to liters, a volume calculator for rainfall, and even a Langelier Saturation Index calculator. * Rainfall Calculator * LSI Calculator (Langelier Saturation Index) * Pressure Units * Flow Rate Converter * Temperature Conversion Area Converters • Square Inches and Shorter Conversion • Square Feet & Yards & Meters Conversion Distance Converters • Inches & Centimeters & Millimeters Conversion • Feet & Yards & Meters Conversion • Nautical Miles, Statue Miles and Kilometers Conversion Volume Converters • US/Imperial to Metric Units Conversion • Metric to US/Imperial Units Conversion • Inches & Centimeters Volume Conversion • Feet, Yards, & Meters Volume Conversion This app features: • Send your calculations or conversions by email • Universal App • iPhone screens are supported • Retina Display graphics • Fast app switching • Automatically Saves Your Inputs • Latest version of iOS is supported No network connectivity required. Note: All information in this app is for informational purposes only.
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
React Navigation
Zustand
react-native-paper
AsyncStorage
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.
