What to look for in a UV Index app
Look for hourly UV, clear risk bands, last-updated state, sunscreen reminders, and language that treats burn timing as an estimate. A bare UV number is helpful, but it is not the whole planning job.
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Fresh data
If UV reads 0 in daylight or the provider is stale, the app should explain that state rather than calculate from a bad number.
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Actionable bands
EPA and WHO bands should map into practical actions: shade, clothing, sunglasses, sunscreen, and shorter windows.
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App handoff
The mobile app is where alerts, saved places, Live Activity, and routine progress can keep working after the web visit.