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
Tanning, UV Index: SunDose
Your personal sun companion
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
2 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.
Build your own version
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 Tanning, UV Index: SunDose: 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
Offer more detailed weather data and alerts.
Assumption to check: Limited features compared to comprehensive weather apps
Validate with people who use this workflow before building.
Hypothesis 2
Introduce customizable notifications and themes.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Consider a freemium model with ads for basic features.
Assumption to check: In-app purchase for fundamental features may deter users
Validate with people who use this workflow before building.
Hypothesis 4
Implement real-time data fetching and updates.
Assumption to check: Slow updates on UV index data
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
Your personal sun companion. Real-time UV data, tailored to your skin. SunDose takes the guesswork out of tanning. Whether you want a golden glow or need to protect sensitive skin, SunDose delivers personalized sessions, smart timers, and live UV intelligence, all calibrated to your skin type and the conditions outside right now. TAN SAFELY EVERY SESSION Start sessions calibrated to your skin type, current UV index, and SPF level. SunDose calculates your safe exposure window and notifies you when to flip, reapply sunscreen, or wrap up. Tan smarter, not longer. REAL-TIME UV INDEX See the UV index for your exact location with hourly and weekly forecasts. Know when the sun is safest, when it peaks, and plan your outdoor time around real data. ROUTINES MADE FOR YOU Get a daily sun care routine tailored to your profile. Log sessions, keep a photo diary, and build habits with routines that adapt to your schedule and skin goals. STAY HYDRATED IN THE SUN Sun exposure increases your body's need for water. Track your intake with a visual bottle tracker and quick-add buttons. Stay hydrated through every session and beyond. KNOW YOUR SKIN'S NEEDS On Retinol? Accutane? Antibiotics? SunDose recognizes 11+ photosensitizing conditions and medications, then adjusts your safe exposure time accordingly. No other tanning app does this. LIVE ON YOUR LOCK SCREEN Your session stays visible on the Lock Screen and Dynamic Island. See your timer, UV level, and controls without unlocking your phone. Pause, resume, or stop with one tap. WIDGETS FOR YOUR HOME SCREEN Check today's UV index, hydration progress, tanning streak, and SPF reminders right from your home screen. Multiple widget sizes to fit any layout. SEE YOUR TAN JOURNEY Review your progress week by week. Session history, average UV exposure, streaks, and trends, all in one place. Understand your patterns and keep improving. SunDose is for people who love the sun but respect their skin. Start tanning with confidence today. This app uses Apple’s Standard End User License Agreement (EULA). Terms of Use (EULA) 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
axios
react-navigation
expo-location
react-native-paper
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.
