I'm not affiliated with either but I just looked at the precursor page because I'm a huge nerd and love crowdfunded projects. They seem to be in slightly diffe

I'm not affiliated with either but I just looked at the precursor page because I'm a huge nerd and love crowdfunded projects. They seem to be in slightly different leagues. Tkey is small and meant to be easily carried with you to authenticate with ssh, gpg and more. While precursor is a full development board that can probably do everything tkey can, and more.