atlan vs 4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting
atlan is a plugin bundle for AI coding tools published by atlanhq. Marketplaces we read that list it: 4 (Claude Code: claude-plugins-official, Claude: knowledge-work-plugins, Claude Code: claude-plugins-community, Community GitHub marketplaces). 4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting is an MCP server published by 4chems.com. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-13. 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 |  atlan |  4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting |
|---|---|---|
| Claude Code: claude-plugins-official | Listed Version: 1.0.0 Forks (GitHub): 31 Stars (GitHub): 40 Not marked · First seen |
Not listed |
| Claude: knowledge-work-plugins | Listed Version: 1.0.0 Forks (GitHub): 31 Stars (GitHub): 40 Not marked · First seen |
Not listed |
| Claude Code: claude-plugins-community | Listed Version: 1.0.0 Forks (GitHub): 31 Stars (GitHub): 40 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.12.1 Forks (GitHub): 0 Stars (GitHub): 0 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 | atlan | 4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting |
|---|---|---|
| Marketplaces that list it (differs) | 4 (better) | 1 (worse) |
| Stars (GitHub) (differs) | 40 (better) | 0 (worse) |
| Forks (GitHub) (differs) | 31 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (mcp.atlan.com/mcp) | Remote server (mcp.4chems.com/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 2 | Not a bundle |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/atlanhq/agent-toolkit | github.com/4chems/mcp |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | not checked yet | Responded 2 h ago |
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
atlan
Atlan data catalog plugin for Claude Code. Search, explore, govern, and manage your data assets through natural language. Powered by the Atlan MCP server with semantic search, lineage traversal, glossary management, data quality rules, and more.
4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting
Remote MCP server for 4chems hosted IUCLID, CHESAR and QSAR Toolbox: onboarding, inquiries, admin.
How to run each
atlan As a Claude Code plugin
/plugin install atlan@claude-plugins-official4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting As a remote MCP server
claude mcp add --transport http platform-api https://mcp.4chems.com/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only 4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting 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: atlan · What it can do: 4chems Platform — IUCLID, CHESAR & QSAR Toolbox hosting · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-official/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from public marketplace files in GitHub repositories of their authors. 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.