What is the difference between social.plus and Circle?

Circle is a community platform that gives you a branded site with discussions, events, courses and payments. social.plus is infrastructure you build into your own app: SDKs, fully customizable UIKit components and APIs for feeds, groups and forums, chat, live streaming, monetization and moderation. The core difference is where the experience lives. With Circle, your community is a separate destination. With social.plus, social and community features are embedded inside your product, under your brand.