Butterbase Oss vs Xerj
A side-by-side look at the Butterbase Oss and Xerj MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
X
XerjKnowledge & MemoryLocal-first search engine and MCP server for AI agents. One Rust binary indexes code, docs, logs, JSONL/CSV and PDFs for BM25 full-text, vector and hybrid search, code search without grep, agent memory and RAG. Elasticsearch-compatible API; Corpus Hub serves hundreds of reference memory corpora.53GoodAuth: no auth requiredVerdict: choose Butterbase Oss for knowledge & memory work as a local process; choose Xerj for knowledge & memory. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Butterbase Oss when
- You need dedicated capabilities in the Knowledge & Memory domain.
- You prefer a local stdio subprocess transport.
XChoose Xerj when
- You need dedicated capabilities in the Knowledge & Memory domain.
- Its auth model fits you: No auth required.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | X Xerj | |
|---|---|---|
| Category | Knowledge & Memory | Knowledge & Memory |
| Quality signal | 51/100 · Good | 53/100 · Good |
| Install command | Confirmed | Not confirmed yet |
| Transport | Local subprocess (stdio) | — |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 3,111 | 10,645 |
| Directory activity | 2 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | Not listed | Not listed |
| Full listing | View Butterbase Oss | View Xerj |
Tools & capabilities
Butterbase Oss tools
No tool names declared yet. Check the project README from the listing page.
Xerj tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Butterbase Oss
{
"mcpServers": {
"mcp-285": {
"command": "npx",
"args": [
"-y",
"@butterbase/mcp"
]
}
}
}
Xerj
No confirmed install command for Xerj yet — follow the setup steps linked from its listing page rather than a guessed package name.
Frequently asked questions
Butterbase Oss is categorized under Knowledge & Memory and uses a local stdio subprocess. Xerj belongs to Knowledge & Memory and uses an install path we have not confirmed yet. Pick Butterbase Oss for knowledge & memory work and Xerj for knowledge & memory.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client. Xerj has no confirmed install command yet — follow its own setup instructions.
Butterbase Oss has no declared pricing — check the project's own site. Xerj is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add mcp-285 and xerj as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Butterbase Oss has a quality signal of 51/100 (Good) with 2 views, 0 installs and 3,111 GitHub stars. Xerj has 53/100 (Good) with 0 views, 0 installs and 10,645 GitHub stars.