postqueen
The open source scheduler built for AI agents
postqueen is the open source core of this list: 30 channels, unlimited posts on every plan, and a full automation surface (CLI, MCP server, REST API, webhooks, Node SDK, n8n node) so agents like OpenClaw, Claude Code, and Codex can run your whole calendar.
The honest part: yes, we ranked our own product first. Cloud plans cap connected channels at 5, 10 or 30 depending on tier, with the top tier uncapped, and AI image and video credits are metered per month. Self-hosting is free if you would rather run everything yourself.