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
Sunrise Sunset Tracker
Master the magic hour and never miss a stunning shot
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
13 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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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 Sunrise Sunset Tracker: map the core Travel 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
Improve the search feature with better location APIs.
Assumption to check: Limited location search accuracy
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature to enable notifications for sunrise/sunset alerts.
Assumption to check: No notifications for sunrise/sunset times
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize how they view times (e.g., 12-hour vs 24-hour formats).
Assumption to check: Lack of customization options for sunrise/sunset display
Validate with people who use this workflow before building.
Hypothesis 4
Implement a freemium model with basic features free and a premium subscription for advanced features.
Assumption to check: Pricing model may deter 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
Master the magic hour and never miss a stunning shot. Track sunrise, sunset, and golden hour times worldwide with our easy-to-use map and offline GPS. Sunrise Sunset Tracker uses your device’s GPS to calculate accurate sunrise, sunset, blue hour, and golden hour times with no internet required. Stay in sync with the sun’s natural rhythm on your iPhone and Apple Watch. View sunrise, sunset, first light, and last light times at a glance, along with remaining daylight. Set reminders, drop map pins, and enjoy widgets and Apple Watch support — all designed for travelers, photographers, and outdoor enthusiasts. PERFECT FOR OUTDOOR ACTIVITIES: Whether you're planning hiking adventures, camping trips, or outdoor workouts, get accurate sunrise sunset times for optimal timing. Our golden hour and blue hour calculator helps photographers capture stunning shots, while fitness enthusiasts can time their runs and yoga sessions with natural light cycles. PRECISE SUN TRACKING FOR PROFESSIONALS: This GPS sun position tracker works completely offline, making it essential for pilots, sailors, and travelers in remote locations. Real estate professionals use our solar calculator to assess property sunlight exposure, while solar installers rely on accurate sun path data for panel positioning and energy calculations. SMART LOCATION FEATURES: Explore our interactive sun path map to visualize the sun's journey throughout the day. Drop pins for custom locations, search any city worldwide, or use GPS tracking for instant results. The app works seamlessly without internet or mobile data, perfect for remote work sites and outdoor adventures. COMPREHENSIVE SUN DATA: Track daylight hours, twilight times, and receive first light and last light notifications. Set up smart sunrise sunset alerts, golden hour notifications, and blue hour reminders. Monitor civil, nautical, and astronomical twilight periods for complete solar movement information. IDEAL FOR: Outdoor enthusiasts, photographers, hikers, campers, travelers, fitness trainers, yoga practitioners, astronomers, astrophotographers, pilots, sailors, solar installers, real estate professionals, gardeners, cinematographers, and anyone who needs reliable solar timing information for work or recreation. KEY FEATURES: Experience our offline GPS sun tracker that requires no internet connection. The minimalist, intuitive interface delivers accurate solar calculations worldwide using smart backup coordinates when GPS is unavailable. Enjoy multiple notification options, custom map pin dropping, and comprehensive daylight duration tracking. Whether you're timing your morning jog, planning a real estate showing, installing solar panels, or capturing the perfect sunset shot, Sunrise Sunset Tracker delivers accurate sun times and solar data anywhere in the world. Download now and optimize your daily activities with the sun!
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
Zustand
axios
expo-location
react-navigation
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.
