Opik vs three.ws Brain
Opik is an MCP server published by comet-ml. Marketplaces we read that list it: 2 (Official MCP Registry, Docker MCP Catalog). three.ws Brain is an MCP server published by nirholas. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-21. 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 |  Opik |  three.ws Brain |
|---|---|---|
| Official MCP Registry | Listed Version: 3.0.6 Downloads/month (PyPI): 3 591 Downloads/week (PyPI): 1 906 Forks (GitHub): 43 Stars (GitHub): 223 Not marked · First seen |
Listed Version: 0.1.4 Downloads/month (npm): 204 Downloads/week (npm): 49 Forks (GitHub): 67 Stars (GitHub): 242 Not marked · First seen |
| Docker MCP Catalog | Listed Version: sha256:0e0d7d33d5eb Forks (GitHub): 43 Pulls (Docker Hub): 17 036 Stars (Docker Hub): 1 Stars (GitHub): 223 Not marked · First seen |
Not listed |
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 | Opik | three.ws Brain |
|---|---|---|
| Marketplaces that list it (differs) | 2 (better) | 1 (worse) |
| Stars (GitHub) (differs) | 223 (worse) | 242 (better) |
| Pulls (Docker Hub) (differs) | 17 036 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 43 (worse) | 67 (better) |
| Last release (differs) | 2026-10-19 | Not published |
| Where it runs (differs) | Remote server or your machine | On your machine (@three-ws/brain-mcp) |
| Transport (differs) | Streamable HTTP, stdio | stdio |
| Tools it declares (differs) | 13 | Not published |
| Environment variables it asks for (differs) | 4, secrets among them: 1 | 3, secrets among them: 1 |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/comet-ml/opik-mcp | github.com/nirholas/three.ws |
| Changes in the last 7 days (differs) | 1 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 5 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
Opik
Read and score Opik traces, experiments, datasets and prompts from your AI assistant.
three.ws Brain
List LLM providers and run chat completions through the three.ws multi-provider router.
How to run each
Opik As a remote MCP server
claude mcp add --transport http opik-mcp https://www.comet.com/opik/api/v1/mcpRequires: OPIK_API_KEY (secret)
three.ws Brain As a local MCP server: npm package
claude mcp add --env "THREE_WS_API_KEY=<YOUR_THREE_WS_API_KEY>" --transport stdio brain-mcp -- npx -y @three-ws/brain-mcpRequires: THREE_WS_API_KEY (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only Opik has a remote endpoint we check. How we check endpoints
Tools each declares
The marketplaces of three.ws Brain publish no list of tools, so we do not compare tools.
Settings each asks for
Only Opik asks for
COMET_URL_OVERRIDEOPIK_API_BASE_URLOPIK_API_KEY (secret)OPIK_URLOPIK_WORKSPACEOPIK_WORKSPACE_NAME
Only three.ws Brain asks for
THREE_WS_API_KEY (secret)THREE_WS_BASETHREE_WS_TIMEOUT_MS
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: Opik · What it can do: three.ws Brain · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.