lumen
Active·★ 202·NOASSERTION·Updated 2026-05-20
★ Trending★ RAG / Knowledge Base
Cut Claude Code costs and latency with precise, local semantic search across your entire codebase. Best for teams working on large code bases. Enterprise-ready and compliant. No subscription or payment or sign up needed.
Lumen is a 100% local semantic code search engine for AI coding agents. It uses open-source embedding models, SQLite, and your CPU to provide fast and cost-effective code understanding. No API keys or cloud required.
#agentic-coding#claude#claude-ai#claude-code#claude-pl#codex#context#gemini
01
Features
01Semantic vector search
02Auto-indexing with Merkle tree change detection
03Incremental updates
04Supports 15 language families
05Zero cloud, fully local
02
Compatibility
Ollama
ollama-backend
Verified via docs
LM Studio
lm-studio-backend
Verified via docs
03
Use cases
↳Enhancing AI coding agents to find relevant code quickly
↳Reducing API costs for code understanding tasks
↳Enabling offline code search without external services
04
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Comments
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- JJordan KimMay 25, 2026
Local execution means no round trips to remote search services.
- KKai KimMay 23, 2026
Local semantic search for Claude Code that cuts costs and latency measurably.
- HHayden WhiteMay 20, 2026
Good for Claude Code users on large codebases where context limits are the bottleneck.
- CCameron RiveraMar 21, 2026
Precise retrieval means smaller context windows — direct cost reduction.