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
Hot Air
Hot Air is a complete balloon flight companion, built by balloon pilots for balloon pilots
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
578 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.
Build your own version
Build Kit
Make this idea yours
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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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 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 Hot Air: 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
Expand partnerships with more hot air balloon companies.
Assumption to check: Limited ride options in certain areas
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a pay-per-ride option.
Assumption to check: High subscription cost for occasional users
Validate with people who use this workflow before building.
Hypothesis 3
Improve map filtering and search functionalities.
Assumption to check: Difficulties in finding rides on the map
Validate with people who use this workflow before building.
Hypothesis 4
Encourage user reviews and ratings for all rides.
Assumption to check: Lack of user reviews for most rides
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
Hot Air is a complete balloon flight companion, built by balloon pilots for balloon pilots. From preflight planning to postflight review, it delivers live tracking, flight recording, waypoint navigation, wind profiling, and more — all designed specifically for the unique needs of hot air ballooning. Whether you’re a student pilot, a commercial operator, or flying for fun, Hot Air helps you stay organized, informed, and connected. Features include: • Live tracking on street or satellite maps • Wind profiling by altitude during climb and descent • Waypoint navigation with bearing, distance, and estimated time • Automatic flight recording with 3D export support • Custom map overlays (KML/KMZ) • Offline-capable with map caching • Real-time flight sharing with crew or friends • Detailed flight logs for crew, passengers, propane, and temperature • Flight summaries and totals for logs or checkrides • Interactive map history of takeoffs and landings • Export to HTML, KML, or GPX • Payload calculator for accurate weight and balance • Integrated weather data and forecasts • Improved UTM 4x4 waypoint format support Additional features: • Real-time heading projection • Built-in data backup and restore • Localized in English, French, Czech, and Slovak • Fully optimized for iPhone and iPad (portrait and landscape) Note: Continued use of GPS can reduce battery life. Use an external battery for longer flights.
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 Navigation
Expo Location
Supabase
Axios
React Native Reanimated
React Native Maps
BUILD KIT DIFFICULTY
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.
