Kerstel

v1.3.1 macOS 14+

System metrics, port management, and AI usage tracking — all from your menu bar. Open source.

$ curl -fsSL https://kerstel.dev/install.sh | bash
Features

Everything you keep checking

One click from your toolbar. No windows to manage, no dock icon.

CPU
Usage, load averages, per-core breakdown
Memory
Active, wired, compressed, cached
Disk
Storage used, free, and total capacity
GPU
Chip, cores, Metal version
Battery
Charge, source, time remaining
Ports
Listening TCP ports with kill controls
Processes
Top 5 by CPU or memory, kill any
Cleanup
Purge memory, clear caches, flush DNS
AI Usage
Claude, Cursor & Codex tracking
AI Tracking

Know where you stand

Reads local credentials and shows your AI coding tool usage at a glance.

C
Claude
Session & weekly utilization, plan type, reset countdown
>_
Cursor
Premium requests used out of monthly quota
ox
Codex
Session & weekly rate limit usage tracking
CLI

Full control from the terminal

Manage Kerstel without leaving your workflow.

kerstel open       # launch the app
kerstel stop       # stop the app
kerstel restart    # restart
kerstel update     # pull latest & rebuild
kerstel version    # show version
kerstel uninstall  # remove everything
Changelog
v1.3.1 Latest
v1.3.0
v1.2.0
v1.1.0
v1.0.0 Initial

Requires macOS 14 (Sonoma) or later and Swift (included with Xcode Command Line Tools). Launches from Spotlight after install.