Turnstile is being presented as “a user-friendly, privacy preserving alternative” to CAPTCHA. According to a press release, it will get rid of the interactive challenges used to verify people, which Cloudflare says normally take an average of 32 seconds to pass, and reduce the entire process to one second.
An interaction-free test that reduces confirmation time to one second
Although hardware keys can work well, they require that users always have access to one. So, the company also made a version that can “ask” a trusted device (smartphone or otherwise) if it’s, in fact, not being operated by a bot.