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
Lateral Pipe Calculator
The Lateral Pipe Calculator is designed for Pipefitter/ welders/fabricators to eliminate the time it takes to calculate Advanced piping calculations for "Fishmouth and Lateral" Connections.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
6 ratings · Top 30%
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 included17 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 Lateral Pipe 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
Incorporate advanced calculation options for different scenarios.
Assumption to check: Limited functionality for complex calculations
Validate with people who use this workflow before building.
Hypothesis 2
Add graphical representations of results.
Assumption to check: Lack of visual aids or graphs
Validate with people who use this workflow before building.
Hypothesis 3
Implement feedback mechanisms or tutorials.
Assumption to check: No user feedback on calculations
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize settings and preferences.
Assumption to check: Minimal customization 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
The Lateral Pipe Calculator is designed for Pipefitter/ welders/fabricators to eliminate the time it takes to calculate Advanced piping calculations for "Fishmouth and Lateral" Connections. Like us on Facebook http://www.facebook.com/PipefitterCalculator - Imperial or Metric calculations - Outputs values as fractions - Outputs values as Decimal - Choose to calculate 8, 16, 32, or 64 Ordinate lines for making templates - Calculate Concentric and Eccentric fit up - Values for Saddle In and Saddle on fit up - Calculates up to 64 ordinate lines for large pipe - Straight up awesome tool. Message me using the Feedback screen inside the app if you have any questions on how to use the ordinate values generated. I will be more than happy to help. Find Me on Facebook http://www.facebook.com/PipeCalculator Your feedback is always welcome on this app, as we are always improving its functionality. if for any reason your device has an issue on install or functionality please let us know. We will fix it. We want everyone to be able to utilize this tool at work to improve their productivity and value as a pipefitter/Fabricator. http://www.pipefittercalculator.com/lmf/contact Contact us either by: Phone: 207-200-1556 Text: 207-200-1556 email:[email protected] Web: www.pipefittercalculator.com (our webpage has a comment form. Enter your info and comments there as well as request to receive updates on existing and new products to improve your workflow) We have unveiled out referral program. Click the link to read more about it. http://www.pipefittercalculator.com/referral.php Please note we make no claim or responsibility in the values generated and the user takes sole responsibility when using this application. Thank you.
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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.
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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.
