Safari 9 was officially released on , alongside OS X El Capitan (version 10.11). However, a standalone version for OS X Yosemite (10.10) was made available on the same day. The iOS version (Safari 9 for iPhone/iPad) launched slightly earlier, on September 16, 2015 , with the release of iOS 9.
Looking back from the present day, the Safari 9 release date feels like a turning point. safari 9 release date