vary.im

"Vary" is a common English word meaning to change or differ, and the root of "variable," one of the first words in programming. With .im, it sounds almost exactly like "very," so anyone can say it, and at six characters it is easy to spell and remember. The meaning points to change and variation — a natural fit for personalization, A/B testing, analytics, dynamic content, adaptive tools, or fashion products that emphasize variety; combined with the .im instant-messaging association, it also works for chat, social, and real-time apps. A four-letter dictionary word with a short suffix is a scarce combination in the domain market.