Show HN: Lumen–free Real-time LLM token and cost monitor

Category: devtools

Tags: llm-monitoring, cost-tracking, proxy

Score: 7.3/10 (Innovation: 6, Technical: 8, Documentation: 8, Utility: 7)

Lumen is a macOS status bar app that acts as a local HTTP proxy to intercept and track LLM API usage, token counts, and costs in real-time. It combines a Rust daemon with a SwiftUI interface for live gauges and event feeds, and offers relay and proxy capture modes for various clients. Its privacy-first design and multi-platform support (macOS, Linux, Windows) make it a practical tool for developers and teams managing AI spending.

Target audience: backend devs, devops, data engineers

Repository: https://github.com/DataGrout/lumen · Rust · MIT · 6 stars

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