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headroom vs xerj

headroom and xerj share 11 technologies: axum, rusqlite, SQLite, Tokio, tower, hf-hub, ort, tokenizers, tracing, prometheus, and tracing-subscriber. headroom is written in Python and xerj in Rust.

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What they share and what sets them apart

headroomlabs-ai

headroom

Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.

Python78.9kRead on November 4, 2026, at commit 31dcaf4What is headroom built with?

Only in headroom

In common

xerj-org

xerj

AI search engine and MCP server for bots and 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.

Rust19.1kRead on November 6, 2026, at commit 87bf7acWhat is xerj built with?

Only in xerj

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
headroom789,601 lines written773 code files
xerj896,832 lines written725 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
headroom28.1% of its commits signed by AIWith Claude Code, GitHub Copilot, Codex, Cursor, Devin, and Mistral Vibe
xerj21% of its commits signed by AIWith Claude Code, Cursor, and Codex
ActivityFrom GitHub and its history, on the day SeeRepo read it.
headroomLast push November 4, 20263,201 commits78,851 stars
xerjLast push November 6, 20262,945 commits19,074 stars
TestsThe files that test the code, and the share of code files a test imports.
headroom1,220 test files68.2% of its code files have a test that imports them
xerj358 test files9.7% of its code files have a test that imports them

Frequently asked questions

Which is bigger, headroom or xerj?
xerj, with 896,832 lines written; headroom has 789,601.

The proof: xerj-org/xerj's code at commit 87bf7ac

Which has more GitHub stars, headroom or xerj?
headroom, with 78,851 stars; xerj has 19,074.

The proof: headroomlabs-ai/headroom on GitHub

Which has more tests, headroom or xerj?
headroom, with 1,220 test files; xerj has 358.

The proof: headroomlabs-ai/headroom's code at commit 31dcaf4

Which was updated more recently, headroom or xerj?
xerj: its last push was on November 6, 2026, and headroom's on November 4, 2026.

The proof: xerj-org/xerj's commits on GitHub

Which has more commits signed by AI, headroom or xerj?
headroom: an AI signed 28.1% of its commits, with Claude Code, GitHub Copilot, Codex, Cursor, Devin, and Mistral Vibe; in xerj, 21%.

The proof: the commits each tool signed in headroomlabs-ai/headroom

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