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
Northern Lights Tracker
Never Miss the Northern Lights Again!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
124 ratings · Top 15%
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 included17 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 Northern Lights Tracker: 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 customizable push notifications for user preferences.
Assumption to check: Limited notifications for aurora alerts
Validate with people who use this workflow before building.
Hypothesis 2
Enhance prediction algorithms using real-time data.
Assumption to check: Inaccurate forecasting
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and improve UI layout.
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options for users to share aurora sightings.
Assumption to check: Lack of community features
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
Never Miss the Northern Lights Again! Northern Lights Tracker is the most advanced and reliable Northern Lights prediction app for travelers, photographers, and aurora enthusiasts. Built with real-time NOAA space weather data, magnetic latitude calculations, and interactive maps, it helps you know exactly when and where the aurora borealis will appear. Whether you are planning a trip to Tromsø in Norway, chasing auroras in Fairbanks Alaska, watching the skies in Iceland, or exploring Rovaniemi Finland and Yellowknife Canada, this app ensures you are always prepared to experience the magic of the northern lights. Unlike basic aurora apps, Northern Lights Tracker combines professional accuracy with an intuitive design. Check aurora probability at your location, see the best viewing spots worldwide, monitor the KP index in real time, and explore global activity maps. You also get solar wind speed, magnetic field strength, and personalized viewing tips. With Apple Watch support and smart notifications, you can chase the aurora without missing the right moment. Key Features • Real-time aurora probability for your exact location • NOAA-powered KP index with scientific accuracy • Interactive maps showing global aurora activity • Best viewing locations like Tromsø, Rovaniemi, Reykjavik, Fairbanks, Yellowknife, and Kiruna • Location-based visibility recommendations • Space weather data including solar wind and magnetic field strength • Smart alerts for high KP index and daily summaries • Apple Watch integration for quick aurora checks • Global coverage with magnetic latitude adjustments Apple Watch Support Stay connected outdoors with seamless Apple Watch integration. Check KP index, view forecasts, and get instant alerts directly on your wrist — perfect for aurora hunters in cold conditions. Intelligent Notifications Northern Lights Tracker only notifies you when conditions are right. Get smart alerts based on real-time KP activity, daylight conditions, and your position. Receive daily summaries, high KP warnings, and viewing alerts that help you catch the aurora at the perfect time. Aurora AI Discover Aurora AI, your smart assistant powered by advanced artificial intelligence. Ask questions, get personalized insights, and receive real-time aurora predictions — all in natural language. Plan your perfect viewing experience with AI precision. Premium Features Upgrade to Northern Lights Tracker Pro and unlock: • Unlimited location searches and map probability checks • Extended list of aurora hot-spots across Iceland, Alaska, Norway, Canada, Finland, and Sweden • Real-time alerts with no limits • Full Apple Watch functionality • Priority customer support Why Choose Northern Lights Tracker? Powered by data from the NOAA Space Weather Prediction Center and other trusted sources, it delivers the most accurate aurora forecasts available. Monitor solar wind, magnetic fields, and geomagnetic storms in real time and plan your next adventure with confidence — from Iceland to Alaska, from Tromsø to Rovaniemi. Perfect For • Photographers chasing the best Northern Lights shots • Travelers planning aurora trips across the Arctic • Astronomy lovers following space weather • Anyone dreaming of seeing the aurora borealis live Northern Lights Tracker combines scientific precision, smart design, and global coverage to make aurora hunting simple and rewarding. From Alaska to Iceland, from Tromsø to Rovaniemi, your perfect aurora moment is just a forecast away. Download Northern Lights Tracker today and experience the most breathtaking light show on Earth. Privacy: https://sites.google.com/view/aurora-forecast-tracker/main Terms: https://sites.google.com/view/aurora-forecast-tracker-terms/main
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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.
SUGGESTED BUILD STACK
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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.
