Zoom aims for parity of software and support across three PC platforms (Windows, Mac, and Linux). A company blogger contrasts this with (unnamed) competitors who (she suggests) offer only a reduced service on the Linux platform.[30] Browser extensions are available as an alternative to installing the program, and for mobile users apps are available for Android, iOS, and BlackBerry.[31][32] A seminar can therefore welcome participants from all five IT platforms, joined on audio by participants dialing in from regular phones.[33]