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
Sundaze: UV & Tan Tracker
Sundaze is your smart personal tanning companion that helps you achieve the perfect tan while protecting your skin
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
47 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 included18 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 Sundaze: UV & Tan Tracker: 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
Introduce advanced analytics for tanning sessions and skin tone tracking.
Assumption to check: Limited features for tracking tan sessions
Validate with people who use this workflow before building.
Hypothesis 2
Add features to share tanning progress on social media.
Assumption to check: Lacks social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Implement push notifications for dangerously high UV index.
Assumption to check: No alerts for extreme UV levels
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI by categorizing features and improving navigation.
Assumption to check: User interface can be cluttered
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
Sundaze is your smart personal tanning companion that helps you achieve the perfect tan while protecting your skin. Real-time UV Tracking • Live UV index for your exact location • 7-day weather and UV forecast • Know the best times to tan each day Personalized For Your Skin • Recommendations based on your skin type • Estimated burn times to keep you safe • SPF guidance for current conditions Your Tan Map • Every tan pinned to its exact spot • A private map of every place you've tanned • See your summer build, pin by pin Smart Tanning Sessions • Session timer with flip reminders • Position guides during sessions • Save and review your sessions with photos Tan with Friends • Add friends and compare progress • See where you rank on the leaderboard • Join one Tan Crew and track your tans together App Themes • Light and dark modes included • Choose from a curated theme library --- Sundaze Pro (subscription required) Unlock the full Sundaze experience with a Pro subscription: • Suni AI: chat with your personal AI tanning advisor • Daily Sun Report: AI-written daily briefing on the day's tanning conditions • Custom Tan Plans: create and save advanced multi-day tan plans • Daily UV Alerts: automatic notifications about peak UV windows • Full Tanning History: view your entire session history (free users see the current month only) • Full Tan Map: see every pin from every month (free users see the current month only) • All Premium Themes: unlock the full app theme library and create your own custom themes • Unlimited Friends: no friend cap and full leaderboard access • Tan Crews: create unlimited crews and join as many as you want (free users can join one) Subscription options: • Weekly: $2.99/week • Monthly: $8.99/month, 3-day free trial • Yearly: $39.99/year, 7-day free trial Auto-renewal & billing: Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period at the same price as your original subscription. You can manage your subscription and turn off auto-renewal at any time in your Apple ID Account Settings after purchase. --- Tan smarter with Sundaze. 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.
SUGGESTED BUILD STACK
React Native
Expo
react-navigation
@react-native-async-storage
expo-location
expo-notifications
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.
