Self-hosted Cal.com MCP alternatives
Cal.com offers both a hosted endpoint and a build you can run yourself, so the process and its credentials can sit on your own machine. If that local-first setup is why you came, the servers below all keep the process on your side, whether over stdio or a local HTTP port.
One honest caveat covers most of them: running the server locally controls where the process and tokens live, but the schedule or chat data still travels to each product's own API. Matrix and Mattermost go a step further, since you can host the chat backend itself inside your network.
The 8 best self-hosted alternatives
- Google Calendar (Workspace MCP)Community
Closest by job and self-hostable. The Google Workspace server, scoped to Calendar, installs locally and reads your calendars, creates events, and checks availability over OAuth, so the process stays yours even as it talks to Google.
Set up Google Calendar (Workspace MCP) → Run it yourself over stdio and the community Slack server reads history, DMs, and search with no workspace bot to install. The local option when an agent confirms a meeting in chat rather than booking the slot.
Set up Slack →Powered by Telethon, the Telegram server runs on your own machine, reading chats, managing groups and contacts, and sending or editing messages and media. Useful when meeting confirmations go out over Telegram.
Set up Telegram →LINE's official server installs locally and pushes or broadcasts text and flex messages, manages rich menus, and reads profiles for a LINE Official Account. It notifies an audience about a booking; it does not run the calendar.
Set up LINE →Schema-first and local, the maintained Airtable server inspects a base, then reads, searches, and writes records, fields, and comments. Fits a booking log kept as rows on a process you control.
Set up Airtable →Coda's server runs on your own machine and connects an agent to docs, pages, tables, and rows. It can hold a schedule as structured data, though it has no notion of availability or a confirmed booking.
Set up Coda →A self-hosted server for Matrix homeservers that reads rooms and messages, sends chats, and manages rooms over local HTTP with OAuth. Reach for it when both the chat backend and the MCP process stay inside your own network.
Set up Matrix →Self-hosted team chat is the point of Mattermost, and its server works with channels, messages, threads, reactions, users, teams, and files from a local process. The pick when the conversation and the server both stay on your infrastructure.
Set up Mattermost →
How to choose
For the same job Cal.com does, Google Calendar is the only true local stand-in here, and it still calls Google's API. Airtable and Coda keep a schedule as rows on a process you run. The rest are chat tools: Slack, Telegram, and LINE reach an external API, while Matrix and Mattermost let you host the chat backend itself locally. Self-hosting controls where the process lives, not where every product's data ends up.
FAQ
- Can the Cal.com MCP server be self-hosted?
- Yes. Cal.com ships both a hosted endpoint and a self-installable build, so you can run the server and hold its credentials yourself. Every alternative on this page also runs locally, over stdio or a local HTTP port.
- Does running the server locally keep my schedule on my own infrastructure?
- It keeps the server process and its tokens on your infrastructure, which is usually the point. The booking and chat data still goes to each product's API, with Google, Airtable, and the rest. Matrix and Mattermost go further, since you can self-host the chat backend itself.