Sun Session calculates your personal sun-protection window - skin type × live UV × SPF - and sends a push notification exactly when protection runs out, with the real UV level at that moment. No app, no account: it runs from any of 420+ city pages on uvindex.now. Also on board: a live UV checker in 4 languages (EN, ES, FR, DE), a sunburn calculator, tomorrow's UV, and free classroom materials that replace EPA's retired SunWise program
