The people you meet are simply whoever happens to be online. In practice that means Antigua and Barbuda and its the Caribbean neighbours — Dominica and Haiti among them — mixed in with strangers from every other continent, which is a fast way to lose an hour.
You will not need a translation app for Antigua and Barbuda. English is the working language, and the only real adjustment is tuning your ear to an unfamiliar accent for the first minute or two.
Time zones do most of the work in deciding who is awake. Antigua and Barbuda runs on UTC−4, so its 8pm is 1am in Lagos and 9pm in São Paulo, and evenings are when conversations stretch past the first question.
No cost and no upsell. The site is ad-free and donation-funded, so people in Antigua and Barbuda get the same unrestricted access as the rest of the Caribbean.
No sign-up, and no app either — it runs in the browser. Confirm you are 18 or over, pick video, voice or text, and start; a session at 8pm in Antigua and Barbuda leaves no more of a trace than one at noon.
English is the working language in Antigua and Barbuda, so you can open with a normal sentence and get one back. Matching is worldwide rather than filtered by country, so you will also meet the Caribbean neighbours who open in something else.
Their evening is the window that works — 8pm at UTC−4. Convert it to your own clock (1am in Lagos, 9pm in São Paulo) and start your session so the two overlap.