Sam Kohl, also known professionally as iupdate, is an American YouTuber and blogger, best known for his Apple-focused videos as well as his podcast, Genius Bar. The name of his YouTube channel was originally iupdateos, which was started in March 2013. As of June 2021, he has over 310 thousand subscribers and over 78 million total video views. Kohl started AppleTrack, a bite-sized Apple blog, in May 2020 during the COVID-19 pandemic.