Speedtest by Ookla

Speedtest by Ookla is a broadband and mobile speed-testing tool, offering desktop and mobile apps across iOS, Android, Windows, macOS and Apple TV, along with data resources including the Speedtest Global Index, Speedtest Performance Directory and Speedtest Awards, which track internet performance across regions. Ookla also owns Downdetector, Ekahau and RootMetrics as related brands.

Each year, 500 million unique visitors use Speedtest, according to the site. Advertising is offered through custom programs with guaranteed placement, including full site takeover, or self-managed options for purchasing individual ad units administered directly by the advertiser.