Outlook Calendar vs Google Calendar
Outlook Calendar is a plugin bundle for AI coding tools published by OpenAI. Marketplaces we read that list it: 1 (Codex: openai-curated (openai/plugins)). Google Calendar is an MCP server published by domdomegg. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-23. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Google Calendar | |
|---|---|---|
| Codex: openai-curated (openai/plugins) | Listed Version: 0.1.8 Forks (GitHub): 965 Stars (GitHub): 7 554 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.1.3 Downloads/month (npm): 341 Downloads/week (npm): 215 Forks (GitHub): 0 Stars (GitHub): 1 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Outlook Calendar | Google Calendar |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 7 554 (better) | 1 (worse) |
| Forks (GitHub) (differs) | 965 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (google-cal-mcp) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 4, secrets among them: 2 |
| Parts of the bundle (differs) | 1 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/openai/plugins | github.com/domdomegg/google-calendar-mcp |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Outlook Calendar
Connect Microsoft Outlook Calendar for scheduling, daily briefs, event prep, and safe meeting changes.
Google Calendar
Allow AI systems to list, create, update, and manage Google Calendar events.
How to run each
Outlook Calendar As a Codex plugin
codex plugin marketplace add openai/pluginsGoogle Calendar As a local MCP server: npm package
claude mcp add --env "GOOGLE_ACCESS_TOKEN=<YOUR_GOOGLE_ACCESS_TOKEN>" --env "GOOGLE_CLIENT_ID=<YOUR_GOOGLE_CLIENT_ID>" --env "GOOGLE_CLIENT_SECRET=<YOUR_GOOGLE_CLIENT_SECRET>" --env "MCP_TRANSPORT=<YOUR_MCP_TRANSPORT>" --transport stdio google-cal-mcp -- npx -y google-cal-mcpRequires: GOOGLE_ACCESS_TOKEN (secret), GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET (secret), MCP_TRANSPORT
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
The marketplaces of Outlook Calendar publish no settings it asks for, so we do not compare settings.
What it can do: Outlook Calendar · What it can do: Google Calendar · Compare two other plugins
Data comes from the public marketplace file https://github.com/openai/plugins/blob/HEAD/.agents/plugins/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.