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
Pipe Fitter Calculator
The Pipe Calculator is evolving to provide more and more information at your finger tips
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
34 ratings · Top 50%
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/
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 Pipe Fitter 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 more calculation types and features.
Assumption to check: Limited functionality compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better input validation and error handling.
Assumption to check: Occasional bugs with user inputs
Validate with people who use this workflow before building.
Hypothesis 3
Revamp UI for a modern look and feel.
Assumption to check: Interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 4
Enhance calculation algorithms for accuracy.
Assumption to check: Inconsistent calculation 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
The Pipe Calculator is evolving to provide more and more information at your finger tips. Quick Facts: - Pipe Offset - 8 options in 1 - Rolling Offset - 9 options in 1 - Reducing Tee Offset - 8 Options in 1 - Back 2 Back Odd Angle Fitting Calculation - 90 to Odd Angle Fitting Calculation - Offset Calculation for Fixed Dimensions - Squaring Odd angle offsets - Squaring Odd angle 90 offsets Tech Data for: All Fitting Sizes Imperial, Metric, DIN 2-Hole Flange Alignment Back 2 Back Fitting Data The Core of this powerful app: - ANSI/ASME Pipe standards for use in Imperial/Metric systems - DIN Pipe standards for those under the Deutsches Institut für Normung or German Institute for Standardization - Input values as Feet, Inches, Fractions, decimal or any combination of. - Input as Cm and MM and decimal or any combination of - Calculate "long radius", "short radius" and "3 Radius" fittings - Use the XR to enter custom value for a Custom Pipe Radius. - Manual input that will work with any pipe standard in the world. - Determines Cut Length of Pipe to build spool piece - Generates Values to cut any angle fitting out of a 90 - Rolling Offsets - Equal Spread offsets up to 4 lines, different pipe sizes for each line, different fitting radius allowed, and detects layout errors for lines with insulation. - Advanced rolling offset vertical outlet - Advanced rolling offset exiting pipe left - Calculates bolt hole rotation for 2-holing flanges in the bench - Pipe Guide Book - Finding angles and sides - Pipe charts for Imperial/ Metric fittings under ASME/ANSI standards Find the App on Facebook http://www.facebook.com/PipeCalculatorApp 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) Please note we make no claim or responsibility in the values generated and the user takes sole responsibility when using this application. Thank you. *** Please note this is a calculator with accurate functions similar to a standard calculator. The data generated is 100% based upon the data you put in. any issues please use the in app feedback screen and contact me and I will assist you.***
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/native
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.
