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
Sunlitt: Sun Tracker & Seeker
# Apple Design Awards Finalist
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
771 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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Sunlitt: Sun Tracker & Seeker: 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
Enhance interactivity with real-time data and animations.
Assumption to check: Limited interaction with the map and sun path data.
Validate with people who use this workflow before building.
Hypothesis 2
Add customizable location features and saved locations.
Assumption to check: Lack of detailed location settings.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce themes and UI customization for a personalized experience.
Assumption to check: Absence of user customization options.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a clearer paywall and feature descriptions for premium features.
Assumption to check: In-app purchase features are not clearly defined.
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
# Apple Design Awards Finalist # Featured on the App Store # Great on iOS 26 # App of the Day # "Apps We Love" by Apple Harness the Power of the Sun with Sunlitt: your all-in-one tool for tracking the sun’s position, movements, and shadows, anywhere and anytime. → Follow the Sun’s Path and Position Access precise, up-to-the-minute sun tracking data tailored to your location, anytime—even without an internet connection. → Analyze Sunlight and Shadows Discover how sunlight interacts with shadows. Perfect for architects, photographers, and outdoor enthusiasts. → Augmented Reality - AR See the sun’s path in your environment and use the Monolitt to visualize real-time shadow movement directly in your scene. → Solar Events Times Stay on top of important solar events like sunrise, sunset, golden hour, blue hour, solstices, and equinoxes with detailed timing information. → Map Dive deeper with powerful tools like the Shadow Map and view the Sun’s Path over terrain or satellite imagery for a thorough visual analysis. → Landform Shadows See how hills, mountains, and valleys affect sunlight by casting real shadows on the 3D map. PRO required. → Monolitt Mode Enjoy a simple yet engaging sun-tracking tool, perfect for daily tasks like finding a good parking spot, selecting a sunny picnic area, or getting the perfect tan! Designed for creators & explorers, Sunlitt works seamlessly offline, syncs across all your devices, and offers: • Support for Apple Watch, iPad, Mac, and Vision Pro • Widgets for Lock & Home Screen • Notifications & Live Activities • App Intents and Shortcuts • Free access to essential sun-tracking features Unlock even more with Sunlitt PRO: Change the date, get twilight details, azimuth, altitude, shadow ratio, weather forecasts, shadows in AR, landform shadows and much more. Whether you’re a photographer, real estate professional, designer, or outdoor enthusiast, Sunlitt is your ultimate tool for tracking the sun’s journey in the sky. Got feedback? We’d love to hear from you! Reach us at [email protected] Loving Sunlitt? Leave a review and share the love! Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
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.
