OpenClaw is a self-hosted AI agent that connects to messaging platforms - Telegram, Discord, and WhatsApp - rather than living in its own separate web app. See OpenClaw messaging channels for how the connection to each platform works.
OpenClaw is one of the newer additions to the App Store; a fuller feature writeup is on the way. It gets the same platform-wide treatment as every other app in the catalog in the meantime - single sign-on, a private access path, and automated backups.
See Installing OpenClaw for the setup walkthrough.