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
Miter Pipe Calculator
The #1 Rated Mitered Pipe Calculator is now available on iOS.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
2 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 Miter 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
Add features for more complex pipe calculations.
Assumption to check: Limited functionality for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a feature to save and share calculations.
Assumption to check: No way to save or export calculations
Validate with people who use this workflow before building.
Hypothesis 3
Create a cohesive design language across the app.
Assumption to check: Inconsistent UI design
Validate with people who use this workflow before building.
Hypothesis 4
Introduce user feedback options for suggestions and bugs.
Assumption to check: Lack of user feedback mechanisms
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 #1 Rated Mitered Pipe Calculator is now available on iOS. The Mitered Pipe calculator is designed for Pipefitter/ welders/fabricators to eliminate the time it takes to calculate normal piping calculations for Miter Offset and WYE Connection. generates 8, 16, 32 and 64 ordinates. - Calculates ordinates for mitered pipe at any angle - Mitered Pipe - Mitered Offset - 180 Degree Mitered Return - Wye Connection - Concentric Reducer - Eccentric Reducer - Orange Peel / Pipe Cap - Calculates miter angle and ordinates for a mitered offset using any degree and number or pieces in the turn. - Mini Pipe chart reference in-screen - NPS Metric Pipe chart sch 5 to sch180, std, XS, XXS - NPS Imperial Pipe chart sch 5 to sch180, std, XS, XXS - Contact Form (suggestions and feedback) - User Guide Find Me on Facebook http://www.facebook.com/pipefittercalculatorapp 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. 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.
SUGGESTED BUILD STACK
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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.
