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
Tan AI: Tanning app
Your Personal AI Tanning Assistant
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
3,852 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/
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Tan AI: Tanning app: 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
Allow users to input detailed skin profiles and preferences.
Assumption to check: Limited customization for skin types and tanning preferences.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social sharing and community tips.
Assumption to check: Lack of community features like sharing tanning experiences.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate multiple data sources for more reliable forecasts.
Assumption to check: Inconsistent data accuracy for UV index.
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free premium subscription to enhance user experience.
Assumption to check: Ads can disrupt user experience.
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 AI Tanning Assistant Tan AI helps you build a safe, personalized tanning routine using AI skin analysis, real-time UV tracking, and smart timers — so you can glow smarter, not harder. How It Works 1. Snap a selfie — AI analyzes your skin tone and undertone 2. Set your goal (gradual glow or deeper bronze) 3. Follow a custom routine with flip reminders, SPF alerts, and UV warnings 4. Track your progress with photos and tone comparisons 5. Ask your AI assistant anything — available 24/7 Key Features • AI Skin Tone Scanner — Personalized analysis from a single selfie • Real-Time UV Index — Live readings, 16-day forecast, and exposure alerts • Smart Tanning Timer — Session timers with flip and SPF reminders • Progress Tracking — Photo comparisons to see your glow evolve • AI Tanning Assistant — Chat anytime about routines, sun safety, or tips • UV Notifications — Get notified when tanning conditions are perfect • Product & Food Suggestions — Recommendations to support your tan naturally • Privacy First — All data stays on your device Frequently Asked Questions What does Tan AI do? Tan AI is a personal tanning assistant that uses AI to analyze your skin tone, create a custom tanning routine, track UV conditions, and help you tan safely. How does the AI skin scanner work? Take a selfie — our AI analyzes your base shade and undertone, then builds a tanning plan tailored to your skin type. Does Tan AI track the UV index? Yes. Real-time UV readings, a 16-day forecast, and alerts when conditions are ideal or when you should take a break. Can Tan AI help prevent sunburn? Tan AI includes SPF reminders, flip timers, and exposure alerts based on your skin type so you can enjoy the sun without overdoing it. Is Tan AI free? You can use Tan AI for free with ads. A subscription removes ads and unlocks the full experience including unlimited AI scanning, advanced UV tracking, and personalized routines. Is my data private? All your photos and personal data stay on your device. We don't store selfies on any server. Can I use Tan AI at the beach or pool? Absolutely! Tan AI is designed for outdoor use — beach, pool, park, or your backyard. The UV tracker works wherever you are. Does Tan AI recommend sunscreen? Yes — Tan AI suggests SPF levels based on your skin type and current UV conditions, plus reminds you when to reapply. What makes Tan AI better than other tanning apps? Tan AI combines AI skin analysis, real-time UV data, smart timers, product suggestions, and a 24/7 AI assistant — all in one app. Does Tan AI help with vitamin D? Tan AI helps you track sun exposure and understand how it relates to vitamin D, so you can get the benefits of sunlight safely. Note: Tan AI does not provide medical advice. Always consult a dermatologist for skin health concerns. Have questions? Reach us at [email protected] Terms: https://usetanai.com/terms Privacy: https://usetanai.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.
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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.
