App Overview

SkyDemon icon

SkyDemon

Divelements Limited · Navigation

SkyDemon is Europe's favourite software for VFR flight planning and in-flight navigation.

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
538 ratings · Top 5%

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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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.

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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Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for SkyDemon: map the core Navigation 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

Simplify navigation and onboarding process.

Assumption to check: Complex user interface can be overwhelming for new users

Validate with people who use this workflow before building.

Hypothesis 2

Implement better data sources for accuracy.

Assumption to check: Inaccurate real-time data can lead to flight planning issues

Validate with people who use this workflow before building.

Hypothesis 3

Offer more robust offline maps and features.

Assumption to check: Limited offline functionality can hinder usability in remote areas

Validate with people who use this workflow before building.

Hypothesis 4

Introduce a freemium model with essential features available for free.

Assumption to check: Subscription costs may deter casual users

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

SkyDemon is Europe's favourite software for VFR flight planning and in-flight navigation. Use this app to access your SkyDemon subscription on your iOS device, unlocking SkyDemon's powerful features while on the move. FLIGHT PLANNING FEATURES - SkyDemon vector charts are the clearest aeronautical charts you'll ever use, with dynamic airspace clipping and choice of map layers - Route planning is as simple as touching consecutive waypoints and dragging to make changes - Virtual Radar shows how your route relates to airspace, terrain, obstructions and other features - Pilot Log facility calculates headings and groundspeeds from actual wind data, and shows useful frequencies - Plates and other documents for relevant airfields are displayed automatically as you plan, and many are available georeferenced for use in flight - Intuitive pan, pinch and rotate support with no loss of map clarity or text legibility - File a VFR flightplan for your route directly to air traffic controllers - Automatic TAF, METAR and SIGMET briefing as you plan a route, with graphical decoding - Rainfall data can be overlaid on the main map, with animation, showing the trend of rainfall over time - Integration of GAFOR route forecasts for Switzerland, Austria, Slovenia and Croatia - Both narrow-route and area NOTAM briefings available, updated as you plan - Advanced NOTAM graphical interpretation and depiction on the main map - Easily print your PLOG and the output from various briefings - Warnings for airspace and other potential hazards to your flight, updated in real time - Airfield Admin Information shows useful contacts and other details for airfields featured in our charts - Forecast winds aloft are automatically retrieved for the flight time and displayed on the map - Create an advanced flight performance profile for each aircraft you use - ATS Routes mode offers an alternative chart presentation for flight along airways - Accurate fuel, weight and balance calculations including flight costings - Create an unlimited number of user-defined waypoints - Analyse your track logs for posterity - Choose between six different vector chart styles - Extensive European chart coverage as standard GPS NAVIGATION FEATURES - Intelligent warnings for approaching airspace, NOTAM, obstacles, terrain and other hazards - Virtual Radar shows a side-on projection of all approaching features and how your trajectory relates to them - Vector map automatically follows the aircraft in north up, track up or course up orientation - Clear and concise instruments show you flight statistics and help keep you on track - An HSI/ILS instrument helps you keep to your planned route and line up early for approach - Live Pilot Log shows progress through your route, ETAs, ATAs and useful frequencies based on your current position - TerrainSafe dynamically colours mountainous terrain around you to quickly identify safer areas - Direct To allows easy re-routing in a hurry by picking from a selection of nearby airfields - Approach Information shows runway diagrams, TAF, METAR, NOTAM and other airfield details useful for making an approach - Live updates of TAF and METAR while in flight, with associated alerts* - Extended runway centrelines appear automatically on the map as you near your destination airfield - Permanent display of position relative to nearest well-known waypoint, for position reporting - Easy changing of the planned route while in flight by touching and dragging Continued use of GPS running in the background can dramatically decrease battery life. * Internet connection required for live weather update while in flight

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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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Advanced

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.