https://rbrn-labs.com/news/ Swelter is an iOS app for planning outdoor activity in the heat. Air temperature and heat index alone undersell dangerous heat, so Swelter runs on WBGT, the standard heat stress index, alongside wet bulb temperature readings, computed right on your iPhone. Built by RBRN Labs, an indie studio in Virginia. en-us https://rbrn-labs.com/news/welcome-to-swelter/ https://rbrn-labs.com/news/welcome-to-swelter/ Thu, 30 Jul 2026 00:00:00 GMT Swelter is a brand-new iOS app that shows how risky it is to be active outdoors right now and helps you find the best times for outdoor activity.