Self-hosted Google Calendar (Workspace MCP) MCP alternatives
The Google Workspace MCP scoped to Calendar already runs on your own machine: you install it and it talks to your agent over stdio, authenticating to Google over OAuth. If you want that same setup but pointed at a different product, every server here runs on your own infrastructure too.
One caveat worth stating plainly. Running the server yourself keeps the process and its credentials on your infrastructure, but the data still travels to each product's own API. None of these reads from a purely local store the way a file-based server would.
The 8 best self-hosted alternatives
- Cal.comOfficial
Cal.com is the closest match for scheduling and runs locally: its server manages event types, bookings, schedules, and availability from a process you control.
Set up Cal.com → Run it yourself and the community Slack server reads history, DMs, and search over stdio with no workspace bot to install. It fits when coordination happens in chat rather than on a calendar grid.
Set up Slack →Powered by Telethon, the Telegram server runs on your own process and reads chats, manages groups and contacts, and sends or edits messages and media.
Set up Telegram →For pushing reminders rather than booking slots, LINE's official server runs locally and broadcasts text and flex messages, manages rich menus, and reads profiles for a LINE Official Account.
Set up LINE →Date-driven records fit Airtable. Its maintained server installs locally and is schema-first: the agent inspects a base, then reads, searches, and writes records, fields, and comments.
Set up Airtable →A planning doc with a date column maps onto Coda, and its server runs on your machine, connecting an agent to pages, tables, and rows for reading and editing.
Set up Coda →Federated chat on your own homeserver: the Matrix server reads rooms and messages, sends chats, and manages rooms over a local HTTP endpoint, so coordination that lives in chat stays on infrastructure you run.
Set up Matrix →Mattermost is the self-hosted team-chat option here: its server works with channels, messages, threads, reactions, users, teams, and files, all from a local process you run.
Set up Mattermost →
How to choose
For local scheduling, Cal.com is the direct match, since it models event types and bookings the way Google Calendar models events. If your coordination is really chat, Matrix and Mattermost keep the server on your own infrastructure, with Slack and Telegram close behind, and Airtable or Coda fit date-driven records and planning docs. Remember the limit: self-hosting controls where the server and tokens live, not where the workspace data ends up, since each product's API still sees it.
FAQ
- Is the Google Calendar MCP server self-hosted?
- Yes. The Google Workspace MCP scoped to Calendar installs locally and runs over stdio, authenticating to Google over OAuth. Every alternative on this page runs on your own infrastructure too, whether over stdio or as a local HTTP service like Matrix, which is the point if you need the process and credentials local.
- Does running the server locally keep my calendar data private?
- It keeps the server process and its OAuth tokens on your infrastructure. The calendar data itself still goes to Google's API, and each alternative still talks to its own product's API. Self-hosting controls the process and credentials, not where the underlying data is stored. Matrix is the closest to fully local, since the homeserver is yours.