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 Tools
Newest edition to the LMFService Pipe apps
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.3
6 ratings · Below Average
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'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 Tools: 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
Provide tool descriptions and usage examples.
Assumption to check: The app lacks detailed explanations for tools.
Validate with people who use this workflow before building.
Hypothesis 2
Add more calculation tools and features.
Assumption to check: Limited functionality in calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a modern design with improved user experience.
Assumption to check: User interface is outdated.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for better handling of complex calculations.
Assumption to check: Performance issues with large datasets.
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
Newest edition to the LMFService Pipe apps. This app will continue to expand with new mini calculators for common and not so common tasks. Current app includes: Temperature converter - Fahrenheit to Celsius to Kelvin Chart included for common metals and their melting point. Linear Length Converter for Nautical Mile, mile, yard, feet, inches, Kilometer, Meter, Centimeter and Millimeter. Pipe Pitch Calculator - Calculates Pitch of pipe, Length of spool Piece, Custom angle fittings, cut length of pipe, elevation change. Pipe Weight Calculator - Calculates weight of pipe based on length, Pipe Size and Pipe Schedule. Use Imperial (lbs) or Metric (Kg) units of measurement. We are always adding new calculators to help improve your worth in the workplace. If you have any suggestions feel free to contact me anytime. This app comes with a small fee of 1.99 and will include ads to help fund future development costs to bring you top quality tools to your mobile device. Thank you very much for your continued support.
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
NativeBase
Axios
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.
