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
The Sun Arc
Follow the Sun helps you see the day differently.
$0.99 · In-app purchases
PRICE
$0.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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.
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 The Sun Arc: 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
Add more interactive features like sun path visualizations.
Assumption to check: Limited features for detailed sun tracking
Validate with people who use this workflow before building.
Hypothesis 2
Simplify in-app purchase process and provide clearer benefits.
Assumption to check: In-app purchase complexity
Validate with people who use this workflow before building.
Hypothesis 3
Implement a feedback system to gather user insights.
Assumption to check: No user reviews to gauge app quality
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their sun tracking settings.
Assumption to check: Lack of personalization options
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
Follow the Sun helps you see the day differently. Watch the Sun travel across the sky, explore sunrise and sunset times, and see how daylight changes throughout the day around you. Scroll forward or backward in time to discover how the sky will look later tonight, tomorrow morning, or months from now. Features include: • Beautiful animated sky views that change with the time of day • Sunrise, sunset, and twilight times for your location • Interactive timelines showing daylight over 24 hours • Light energy curves that reveal how sunlight changes throughout the day • Directional sky maps showing where sunlight comes from at different times • Apple Watch support for checking the sky at a glance • Explore future and past dates simply by turning the Digital Crown or scrolling Whether you're planning a walk, taking photographs, heading outdoors, or just curious about the changing sky, Follow the Sun turns solar data into something you can see and explore. No forecasts, no clutter, and no complicated charts — just a different way of looking at the day.
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
React Navigation
@react-native-maps
date-fns
expo-location
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.
