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
Sun Tracker AR
Sun Tracker AR is an essential digital tool for e.g
$11.99 · In-app purchases
PRICE
$11.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,037 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 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 Sun Tracker AR: map the core Photo & Video 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
Optimize power usage and provide battery-saving modes.
Assumption to check: AR features may drain battery quickly.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize colors and display settings.
Assumption to check: Limited customization options for sun path display.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a guided tutorial for first-time users.
Assumption to check: Some users find the interface confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear explanations and previews of premium features before the paywall.
Assumption to check: Premium features are unclear to 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
Sun Tracker AR is an essential digital tool for e.g. photographers, architects, prospective house buyers, garden enthusiasts, surveyors and installers of solar panels. The intuitive, sleek interface provides access to a comprehensive range of professional functionalities. SOLAR PATH IN AR Augmented Reality projection of the position of the sun at your current location. MULTIFUNCTIONAL MAP PRESENTATION Extensive 2D and 3D visualization of the solar path, compass mode and shadow simulator. You can see at a glance which side of a building gets the most hours of sunlight per day. DATA TABLES A comprehensive overview of sun positions, day and night lengths, sunrise and sunset times, golden hour and dusk (astronomical, nautical and civil). All solar eclipses, winter and summer solstices and equinoxes. INTERACTIVE 3D SHADOW SIMULATOR Position a customizable 3D object (a box or a tree) on the map to have the app simulate its shadow at any time of year. Furthermore the user can add a target spot near the object. The app will calculate how long is the spot under the shade of the object and how long in direct light. DAY & NIGHT MAP Map visualization of the current position of the line between day and night. CALENDAR NOTIFICATIONS Calendar notification with selectable solar events (sunrise, sunset, solar eclipse) and a choice to receive one-time or daily notifications. WIDGET Our widget keeps you informed about the approaching sunrise and/or sunset. No ads! The free version of the app shows all information about solar positions for your current time and location only. The paid Premium version of the app grants you access to information for any location for any time of year.
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.
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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.
