App Overview

UV Index Widget - Worldwide icon

UV Index Widget - Worldwide

Bjorn Jenssen · Weather

UV Index Widget - Worldwide brings one of the most useful pieces of weather data, the UV Index, front and center

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
14,582 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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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/
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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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for UV Index Widget - Worldwide: 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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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

UV Index Widget - Worldwide brings one of the most useful pieces of weather data, the UV Index, front and center. Use this app to track your UV exposure, help plan your day outside, and avoid burning. Perfect for planning your tanning routine. UV Index Widget - Worldwide is a convenient app that lets you monitor the Sun’s radiation levels anywhere on Earth. It shows the current UV Index, today’s peak forecast, and a 7-day UV forecast. You can add the UV Index to your Home Screen via widgets, receive alerts when UV Index reaches specific levels, and automatically log the data to your Apple Health app. The app instantly displays your current UV Index (UVI) in an easy-to-understand format. Just tap and hold to view today's highest UVI reading. You can also check the sunrise and sunset times, along with the moment when the UV Index peaks. 7-day hour-by-hour forecast: The Forecast tab provides an hour-by-hour UVI prediction for the next 7 days. My Skin: In the My Skin section, select your skin type for tailored safety tips and recommendations. You can also monitor your sun exposure and receive alerts when there’s a high risk of sunburn. Additionally, the app tracks your Vitamin D production from sunlight and automatically syncs the data to your Apple Health app. Places: In the Places tab, you can select any location around the world to see its current UV radiation and a 7-day forecast. It's a great tool for checking the UV levels at your travel destination before you head out. Widget: The app offers a variety of Home Screen widgets and Lock Screen Widgets, designed for both your iPhone and Apple Watch. Choose from multiple options to customize your experience on the Home Screen, Today view and Apple Watch. Notifications: The app alerts you when the UV Index exceeds your specified threshold, sending a notification whenever your area's UV levels surpass that mark. It also warns you when you're at high risk of sunburn and reminds you to reapply sunscreen. Apple Health app: The app automatically logs your location's hourly UV Index and the vitamin D generated from sun exposure into the Apple Health app. Open Apple Health to review your UV exposure history and vitamin D data. Apple Watch: Monitor the UV Index directly from your watch. Tap and hold to view today's peak UVI, just like in the iOS app. The watch app also features a My Skin section and a 7-day hourly forecast. Additionally, you can always check the UVI right on your favorite watch face using the included UVI complications. The app will work anywhere in the world, and is a perfect companion whether you are at home or travelling. --- Information about UV Index Widget - Worldwide subscription: -At confirmation of purchase, or following the completion of a free-trial period, payment will be charged to your iTunes account. - Yearly subscriptions are available. - Payment will be charged to your iTunes account at confirmation of purchase. - Your subscription will automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. - Your account will be charged for renewal within 24-hours prior to the end of the current subscription period. Automatic renewals will cost the same price you were originally charged for the subscription. - You can manage your subscriptions and turn off auto-renewal by going to your Account Settings on the App Store after purchase. -Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Terms of Use: https://uv-index-worldwide.web.app/tos_bjorn_jenssen.html --- The UV Index scale used in this app conforms with international guidelines for UVI reporting established by the World Health Organization.

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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 edit or delete saved locations easily.

Assumption to check: Limited customization for users to manage locations.

Validate with people who use this workflow before building.

Hypothesis 2

Implement a more diverse set of backgrounds for better clarity.

Assumption to check: Inconsistent background images based on conditions.

Validate with people who use this workflow before building.

Hypothesis 3

Provide customizable notifications based on user preferences.

Assumption to check: Notifications may be too generic.

Validate with people who use this workflow before building.

Hypothesis 4

Include a feature to view historical UV index trends.

Assumption to check: Lack of historical UV index data.

Validate with people who use this workflow before building.

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
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.