AgentIndex icon
AgentIndex
Noema logo
Noema
★ 23
vs
xerj logo
xerj
★ 17.1k

Noema vs xerj

Noema: Noema gives AI agents and the humans beside them a persistent, structured place to record what they know, decide, observe and intend. Every memory is a plain markdown file, indexed locally in SQLite with FTS5, and exposed as an MCP server.; xerj: XERJ is a single Rust binary that auto-indexes any folder (code, docs, logs, CSV, PDFs) for BM25, vector and hybrid search behind an Elasticsearch-compatible API. It plugs into Claude Code, Cursor and other MCP clients so agents retrieve exact passages instead of reading files one by one.

01

TL;DR

Noema logo
NoemaMCP Servers · ★ 23

Give Claude Code, Copilot, Zed or Cursor persistent memory

Read Noema full review →
xerj logo
xerjMCP Servers · ★ 17.1k

Reference coding: clone and index similar open-source repos, then retrieve how they solved a problem

Read xerj full review →
02

Side-by-Side Comparison

Field
Noema logoNoema
xerj logoxerj
Category
MCP Servers
MCP Servers
Stars
★ 23
★ 17.1k
License
MIT
Apache-2.0
Install Command
brew install Fail-Safe/tap/noema
curl -fsSL https://xerj.org/get | sh
Updated
6d ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
agent-memory, agents, ai-tools
agent-memory, ai-agents, bm25
03

Features

Noema logoNoema
01Plain markdown on disk as the source of truth, with a local SQLite index
02No cloud, no API keys, no telemetry
03Single cross-platform Rust binary for macOS, Linux and Windows
04Peer-to-peer federation across memory collections
xerj logoxerj
01xerj autoindex sniffs every file and creates typed indices with no schema or pipeline to write
02Code indexed with symbols and line numbers via tree-sitter, plus go-to-definition (xerj def)
03BM25 full-text, kNN vector and hybrid search behind an Elasticsearch-compatible API
04xerj init wires it into Claude Code or Cursor as an MCP server plus skill in one command
05/_memory namespaces give agents long-term memory recalled by meaning
04

Use Cases

Noema logoNoema
↳Give Claude Code, Copilot, Zed or Cursor persistent memory
↳Edit agent memories in Obsidian or VS Code alongside the agent
xerj logoxerj
↳Reference coding: clone and index similar open-source repos, then retrieve how they solved a problem
↳Codebase Q&A and RAG with answers cited by file:line
↳Security audits and log/incident analysis across mixed file types
↳Persistent agent memory across sessions
05

Best For

Noema logoNoema
—
xerj logoxerj
Most Popular
FAQ

FAQ

What is the difference between Noema and xerj?
Both Noema and xerj are in the MCP Servers category. Noema has 23 stars, while xerj has 17.1k stars.
Which is better, Noema or xerj?
The best choice depends on your use case. Choose Noema if Give Claude Code, Copilot, Zed or Cursor persistent memory, and xerj if Reference coding: clone and index similar open-source repos, then retrieve how they solved a problem.
Is Noema free or open source?
Yes, Noema is open source on GitHub (MIT).
Is xerj free or open source?
Yes, xerj is open source on GitHub (Apache-2.0).
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Alternatives to Noema →Alternatives to xerj →Noema details →xerj details →