What mobile OS competes with Android?

The primary competitor to Android in the mobile operating systems market is iOS, developed by Apple. The competition between Apple and Android manufacturers has significantly influenced the smartphone landscape and, consequently, search engine usage in the U.S.[1].

Additionally, Tizen, created by Samsung, is mentioned as another mobile operating system, though it's less prominent compared to iOS. Historically, Blackberry and Windows Mobile were also part of the competitive landscape, but their current status as competitors is unclear[2].