App Overview

UV Index - Sun rays icon

UV Index - Sun rays

LionsApp di Nallbati Elton · Weather

Never let your guard down.

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.9
11 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.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

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.

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.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

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 - Sun rays: map the core Weather workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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 manually add locations.

Assumption to check: Limited location settings can frustrate users.

Validate with people who use this workflow before building.

Hypothesis 2

Include home screen widgets for instant UV index viewing.

Assumption to check: No widget support for quick access.

Validate with people who use this workflow before building.

Hypothesis 3

Implement alerts for significant UV index changes.

Assumption to check: Lack of notifications for changing UV levels.

Validate with people who use this workflow before building.

Hypothesis 4

Provide more educational content about UV risks and protection.

Assumption to check: Insufficient detailed UV index explanations.

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

Never let your guard down. Protect yourself from the risks that uncontrolled exposure to the sun can cause. The App helps protect you from UV rays, giving you the level of solar ultraviolet radiation that reaches the earth's surface at your location. Index values range from zero upwards: the higher the value, the greater the potential for skin and eye damage. The UV index was conceived with a view to increasing population awareness of the risks of excessive exposure to solar radiation and was developed as part of a collaboration between the World Health Organization, the Program for the Environment of United Nations (UNEP), the World Meteorological Organization and the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Make sure you have turned on your device's Location Services and are connected to the Internet. At this point the application will detect your geographical position. The display will show the name of the place and the value of the UV radiation, also indicating recommendations for the level of protection required. [ CHARACTERISTICS ] • Measurement of UV radiation in real time • Location detection • Detection of weather conditions • Recommended clothing indicator for the protection of the sun's rays • Search City • Save favorite places (unlimited) • Ease of use [ COMPATIBILITY ] • Devices: All iPhones, iPads and iPods. • iOS: 17.0 or later. [ SUPPORT ] If you need help, do not hesitate to contact us at [email protected], or visit our website at www.lionsapp.com If you like the app, don't forget to leave us a review in the App Store.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

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
Zustand
Axios
react-navigation
expo-location
BUILD KIT DIFFICULTY
Starter

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.