CallHub is described as 'Hosted voice broadcasting software. It is used to call people and alert them of deals, updates, building closures and other information quickly. Campaigns can be run at very high number of calls per second' and is an website. There are more than 25 alternatives to CallHub, not only websites but also apps for a variety of platforms, including SaaS, iPhone, Windows and Linux apps. The best CallHub alternative is OnAir. It's not free, so if you're looking for a free alternative, you could try EasyCall Phone Call Center or MyOperator. Other great sites and apps similar to CallHub are CallRail, Bland.ai, Clickatell and Voiptime Cloud Call Center.