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
Oilfield LWD Calculation
LWD Calculation is a powerful and easy-to-use oilfield calculator designed specifically for the needs of Directional Drilling and MWD/LWD professionals.
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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Combine features and design from your favorite apps.
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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 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 Oilfield LWD Calculation: map the core Reference 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
Incorporate tooltips and help sections for each calculator.
Assumption to check: Limited user feedback or guidance on calculations
Validate with people who use this workflow before building.
Hypothesis 2
Simplify inputs and provide examples for better understanding.
Assumption to check: Potentially complex calculations may confuse users
Validate with people who use this workflow before building.
Hypothesis 3
Enable sharing of calculation results via social media or messaging.
Assumption to check: No sharing functionality
Validate with people who use this workflow before building.
Hypothesis 4
Add diagrams or charts to support calculation results.
Assumption to check: Lack of visual aids for understanding calculations
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
LWD Calculation is a powerful and easy-to-use oilfield calculator designed specifically for the needs of Directional Drilling and MWD/LWD professionals. Whether you're on the rig or in the office, this app provides accurate, field-ready tools to support efficient decision-making and real-time calculations. Included Calculators: • ROP Calculator – Calculate rate of penetration based on time and depth. • Record Rate Calculator – Track peak drilling performance. • Data Density Calculator – Evaluate logging quality per measured depth. • Dogleg Severity + Minimum Curvature – Compute DLS and well path geometry with high precision. …and more tools are being added to support your downhole operations. Key Features: • Supports feet/meters unit toggle • Fast, accurate, and field-tested formulas • Clean interface built for real-world use • Works offline – no signal required
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
React Native Paper
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.
