Recommend HelloTalk. Unresponsive Zendesk team support. The usual crowd of cryptocurrency folks, sex workers & people using it as a dating app. BUT they act on reports quickly. Tandem is a good app in theory. Relatively safe space with a good set of community principles. Looks like integration with Babbel is coming, bonus. It's difficult to use as the majority of people on the app are in their 20s & I am in my 40s. If reported, there's no explanation provided for the ban & no appeals process.