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
Sunny Pal
Sunny Pal - UV Index & Appearance Tracker
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
1,455 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/
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 Sunny Pal: 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
Utilize multiple data sources for improved accuracy.
Assumption to check: Inaccurate weather predictions
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their dashboard and notifications.
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 3
Optimize API calls and caching.
Assumption to check: Slow loading times during peak hours
Validate with people who use this workflow before building.
Hypothesis 4
Offer a premium ad-free experience.
Assumption to check: Ads can be intrusive
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
Sunny Pal - UV Index & Appearance Tracker Sunny Pal helps you review local UV conditions, weather, SPF prompts, timers, and optional photo-based appearance estimates before spending time outdoors. Use Sunny Pal to check current UV levels, view weather conditions, set reminder windows, track visible shade changes, and keep your sun-related routine organized. Results vary, and Sunny Pal does not guarantee visible appearance changes or prevent sunburn. How It Works: Check UV & Weather: View local UV index, temperature, humidity, and forecast details. Set Reminders: Use SPF prompts, timer check-ins, and shade-break reminders. Optional Selfie: Estimate visible skin tone and appearance from a photo. Track Progress: Log visible shade changes and review your history over time. Home Screen Widgets: See UV, weather, and SPF prompts at a glance. Key Features: Real-time UV index and weather information UV-aware reminder windows SPF prompts and timer check-ins Home screen widgets for quick updates Photo-based appearance estimates Visible shade and session history tracking Informational UV guidance and app limitations Sunny Pal is for informational purposes only and is not medical advice. Sunny Pal does not diagnose, treat, or prevent sunburn, skin damage, or any medical condition. Consult a healthcare professional for medical advice. Use sun protection according to product labels and local conditions. A subscription is required to use Sunny Pal. Your subscription will be charged to your Apple account upon purchase and will automatically renew unless canceled at least 24 hours before the end of the current period. Manage your subscription anytime in your Apple Account Settings. Terms of Service: https://www.getsunnypal.com/terms Privacy Policy: https://www.getsunnypal.com/privacy
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 Navigation
Axios
React Native Maps
Zustand
Expo
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.
