Pick two types: yours and someone else's. You'll get the relation between you, where each of your functions sits for the other person, and what that means for planning together, explaining things, disagreeing and working under pressure. Nothing is stored on a server; the link at the bottom saves the pair so you can come back or send it on, and there's an image of it to post if you like.
Not sure of a type? The 12-question test gives you a working answer in a few minutes.
How this is put together: the relation, natural task and comfortable distance come from the site's relation data and socionics-core. Where each function sits is read straight from both types' Model A. The groups, and the tips beside them, summarise the site's own group pages: planning styles, perception groups, quasi-quadras, stress resistance, implementation groups and romance styles, mostly drawn from R.K. Kovalenko and N.A. Zvonaryova's 2020 lecture course and V.V. Gulenko's work. Treat it as a set of tendencies to test against the real person, not a verdict.