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.
SPF helps you understand UV conditions and plan your time in the sun with a personalized routine built around your skin type.
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for SPF - Tan Timer & UV 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
SPF helps you understand UV conditions and plan your time in the sun with a personalized routine built around your skin type. WHAT YOU GET WITH YOUR SUBSCRIPTION - Real-time UV index — see current UV levels for your location - Personalized tanning routine — tailored to your skin type - Quick Tan timer — time your tanning sessions - Tan progress tracking — log your sessions A clear plan instead of guesswork. Built for people who want structure around their time in the sun. Download SPF and start building your routine. — — — SUBSCRIPTION SPF is a subscription-based app. An active auto-renewable subscription is required to access app features. SPF Premium is $5.99/week with a 3-day free trial. Pricing and subscription length are also shown in the app before purchase. - Payment is charged to your Apple ID at confirmation of purchase. - Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. - Your account is charged for renewal within 24 hours prior to the end of the current period. - Manage subscriptions and turn off auto-renewal in your Apple ID Account Settings. - Any unused portion of a free trial is forfeited upon purchase of a subscription. DATA & PRIVACY SPF processes facial and skin images on your device to estimate skin attributes (such as tone and skin type) used to personalize your tanning routine. No biometric identification data is collected. All image data is stored exclusively on your device and is deleted when you uninstall the app. HEALTH & SAFETY NOTICE SPF provides general guidance based on UV index and weather data. It is not a medical device and does not provide medical advice, diagnosis, or treatment. UV exposure carries inherent risks, including skin damage, premature aging, and skin cancer. Consult a qualified healthcare professional or dermatologist before making decisions about sun exposure, particularly if you have a history of skin conditions, are taking photosensitizing medications, or have other health concerns. Always follow guidance from medical professionals over recommendations in this app. WEATHER DATA SPF uses Apple Weather to provide UV index and weather information. Learn more about Apple WeatherKit at: https://weatherkit.apple.com/legal-attribution.html LINKS Terms of Use (EULA): https://forested-danger-c97.notion.site/SPF-Terms-and-Conditions-1d21673c1ce280598b03c03583b3bf14 Privacy Policy: https://forested-danger-c97.notion.site/SPF-Privacy-Policy-1d21673c1ce2807fa560e63f8cb21191
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited customization for users' UV index notifications
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of detailed tanning information based on skin type
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.