Slack vs Apple Mail MCP
Slack is a plugin bundle for AI coding tools published by Salesforce. Marketplaces we read that list it: 1 (Claude: knowledge-work-plugins). Apple Mail MCP is an MCP server published by jayvee6. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-19. 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 |  Slack |  Apple Mail MCP |
|---|---|---|
| Claude: knowledge-work-plugins | Listed Version: 1.0.0 Forks (GitHub): 3 427 Stars (GitHub): 30 326 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.0 Downloads/month (npm): 204 Downloads/week (npm): 36 Forks (GitHub): 2 Stars (GitHub): 2 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 | Slack | Apple Mail MCP |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 30 326 (better) | 2 (worse) |
| Forks (GitHub) (differs) | 3 427 (better) | 2 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (mcp.slack.com/mcp) | On your machine (@jdot6/apple-mail-mcp) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 8 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/anthropics/knowledge-work-plugins | github.com/jayvee6/apple-mail-mcp |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 3 days ago, requires a key | no remote endpoint we check |
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
Slack
Slack integration for searching messages, sending communications, managing canvases, and more
Apple Mail MCP
LLM access to Apple Mail and iCloud via AppleScript. Read, search, compose, reply, flag and delete.
How to run each
Slack As a Claude Code plugin
/plugin marketplace add anthropics/knowledge-work-plugins
/plugin install slack-by-salesforce@knowledge-work-pluginsApple Mail MCP As a local MCP server: npm package
claude mcp add --transport stdio apple-mail-mcp -- npx -y @jdot6/apple-mail-mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Slack has a remote endpoint we check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Slack · What it can do: Apple Mail MCP · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/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.