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
El Tubero 2.0
This application is the updated and expanded version of Trazado de tubería El Tubero.
$3.99
PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 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.
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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 included15 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 El Tubero 2.0: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
This application is the updated and expanded version of Trazado de tubería El Tubero. With it, you can calculate the development of any pipe branch, track fitting runs, calculate bends, elbow cutting dimensions, pipe combs, determine the size and number of bolts required for each flange, calculate volumes and weights, use a unit converter, and much more. NEW FEATURES compared to El Tubero: - Language options include Spanish, English, Chinese, Hindi, French, Bengali, Portuguese, Russian, Indonesian, Swahili, German, Japanese, Italian, Romanian, Turkish, Korean, Urdu, and Arabic. - Calculate branch tapping. - Create pipe-to-elbow and elbow-to-pipe branches, including tapping. - Bevel-to-bevel bends. - Pipe dimensions from 14 different standards, including 9 metric stainless steel standards for the pharmaceutical and food industries. - Dimensions of screws and bolts for 5 different standards. Also includes wrench dimensions in both millimeters and inches. - Dimensions of gaskets for 6 different standards, including gaskets for RTJ flanges. - Dimensions of flanges for 4 different standards, including metric stainless steel flanges for the pharmaceutical and food industries. - Dimensions of BW elbows for 5 different standards, including metric stainless steel for the pharmaceutical and food industries. - Dimensions of tees for both ANSI and the pharmaceutical and food industries. - Dimensions of reducers for both ANSI and the pharmaceutical and food industries. - Dimensions of valves: flanged gate, flanged globe, flanged check, SW gate, SW globe, SW check, wafer check, wafer butterfly, lugged butterfly, ANSI flanged ball, DIN flanged ball, and SW ball. - Dimensions of flanged filters according to ANSI and DIN standards. - Cut elbows according to 5 different standards, including those used in the pharmaceutical and food industries. You can even manually specify the radius and diameter. - Expanded and improved unit converter. - Tightening torques for screws and bolts. You can see a sample video at the following link: https://www.youtube.com/watch?v=FDrwTxRHZD0 For any complaints or questions, please write to [email protected]
Written user reviews are not shown here. Check current App Store reviews >
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 additional features for complex measurements and calculations.
Assumption to check: Limited functionality for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Enhance visual aesthetics to improve user engagement.
Assumption to check: Unattractive UI design
Validate with people who use this workflow before building.
Hypothesis 3
Add a feedback or rating system to gather user insights.
Assumption to check: Lack of user feedback options
Validate with people who use this workflow before building.
Hypothesis 4
Implement iCloud sync to save measurement history across devices.
Assumption to check: No iCloud sync for history
Validate with people who use this workflow before building.
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
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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.
