App Overview

XW Calc - Crosswind Calculator icon

XW Calc - Crosswind Calculator

Jeff Quayle · Weather

Crosswind calculations shouldn't require a keyboard

$2.99 · In-app purchases

PRICE
$2.99
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.

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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for XW Calc - Crosswind Calculator: map the core Weather 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

Implement features to save and share calculations on social media.

Assumption to check: Limited user engagement due to lack of advanced features such as saved calculations or sharing results.

Validate with people who use this workflow before building.

Hypothesis 2

Provide clear descriptions of premium features and benefits.

Assumption to check: In-app purchase model might confuse users about what features are premium.

Validate with people who use this workflow before building.

Hypothesis 3

Add a feedback feature to gather user insights and improve the app.

Assumption to check: No user feedback options, making it hard to understand user satisfaction.

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

Crosswind calculations shouldn't require a keyboard. XW Calc uses four rotary knobs — runway, wind direction, speed, and gusts — to give you an instant, always-current answer. Designed for one-handed cockpit use. Rotary Knob Controls Touch any dial directly on the value you want, then drag to fine-tune. Four knobs for runway heading, wind direction, wind speed, and gust. No typing. No menus. Results update as you move. Keypad Mode Prefer numbers? Switch to the keypad view for direct numeric entry. Same instant results, different input style. Both modes are always one tap away. Instant Crosswind Crosswind and headwind components update in real time as you adjust any parameter. Color-coded severity at a glance — green when you're well within limits, amber when it's worth thinking about. Gust Factor Aware Separate gust speed input with automatic Vref adjustment advisories. Know exactly how much extra speed to carry for gusty conditions before you turn final. Pilot Advisories Automatic recommendations for flap reduction when crosswinds are significant. Tailwind warnings with Vref adjustments. Directional indicators show which side the wind is hitting — no math required. Flip the Runway Tap the runway number in the readout to instantly switch to the opposite end. Perfect for non-towered fields where you're deciding which direction to use — see both options in seconds.

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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.

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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.