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
Piping Offset Calculator
Piping Offset Calculator provides precise dimensions and cut lengths for different types of piping offset spool configurations, pipe sizes, and bend angles
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
14 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.
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 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 Piping Offset Calculator: map the core Utilities 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
Enhance functionality with additional calculation types and features.
Assumption to check: Limited calculation features compared to other utilities apps.
Validate with people who use this workflow before building.
Hypothesis 2
Redesign UI for better accessibility and aesthetics.
Assumption to check: User interface could be more modern and user-friendly.
Validate with people who use this workflow before building.
Hypothesis 3
Implement clipboard support to easily copy calculations.
Assumption to check: No clipboard integration for copying results.
Validate with people who use this workflow before building.
Hypothesis 4
Include advanced piping calculations and customizations.
Assumption to check: Lack of support for advanced piping scenarios.
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
Piping Offset Calculator provides precise dimensions and cut lengths for different types of piping offset spool configurations, pipe sizes, and bend angles. Piping Offset Calculator is designed to be used by draftsman, designers, engineers, and construction personnel. Piping Offsets have never been easier to calculate. The offset calculator is very intuitive and flexible: the graphical menu is provided to easily select the type of offset you wish to compute. User supplies any three sides and/or angles combination(s). The user is presented with the solved graphical representation of the offset. The complete graphics include multiple solution views which provide clear, graphical, design and fabrication data. All bend angles, tangents, cut lengths, rise, run, hypotenuse, miter angles, roll angles, inside and outside arc lengths of mitered ells, etc are presented. User can select 1/4" through 48" pipe sizes, preset bend or ell radius, or the user can also choose a fixed user input numerical radius for those unusual bend radius requirements. Even though the offset calculator automatically calculates trimmed elbows (per user request), now includes a separate tool to calculate trimmed elbow dimensions. To learn more about this useful tool, browse www.jplanaux.com or go to you tube and search "Piping Offset Calculator".
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
expo-clipboard
@react-native-async-storage/async-storage
TypeScript
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.
