Is there a free, open-source alternative to CodexBar or Vibe Island?

Yes. Agent Island is a free, MIT-licensed, open-source status companion for your AI coding agents. It runs natively on both macOS and Windows, shows live session state, and alerts you when a background run needs you.

Is there a Claude Code / Codex usage and status tool for Windows?

Agent Island runs natively on Windows 10 and 11 as a self-contained WPF app. Its verified shared scope is live session state, your-turn alerts, and local monitoring.

Compare | Agent Island

Product	Price · source	Platforms	Surface	Live state	Usage	Best fit
Agent Island	Free · MIT	macOS + Windows	Menu bar, notch + floating bar	Claude · Codex · Gemini · Grok · Cursor	Claude · Codex · Gemini · Grok · Cursor	Cross-platform session attention
CodexBar	Free · MIT	macOS	Menu bar	Not documented; quota alerts	Broad provider coverage	Compact multi-provider quotas
ClaudeBar	Free · public repo, no license declared	macOS	Menu bar	Not documented	Claude, Codex, Gemini, Copilot + others	Native provider usage view
Usage4Claude	Free · MIT	macOS	Menu bar	Not documented	Claude + Codex limits	Focused quota countdowns
Vibe Island	Paid · closed source	macOS	Notch	Sessions, permissions + sounds	Documented	Notch-based agent control
ccusage	Free · public repo	CLI / Node-supported OS	Terminal	Not documented	Reports + machine-readable output	Scriptable cost analysis
Open Island	Free · GPL-3.0	macOS 14+	Notch / top bar	Sessions, permissions, jump-back + sounds	Claude + Codex tracking	Open-source Mac control surface
Agent Notch	Free · MIT	macOS 12+	Notch indicator + panel	Busy, idle, done by process/transcript inference	Not documented	Zero-config Claude + Codex status

The biggest difference

Agent Island combines live status and Usage for Claude, Codex, Gemini, Grok, and Cursor in one cross-platform desktop companion. Most alternatives go deeper in one narrower direction: provider quotas, terminal reports, Mac notch controls, direct approvals, or lightweight process detection.

Where the alternatives are excellent

CodexBar and ClaudeBar are strong native macOS choices for broad quota visibility. ccusage is excellent for scriptable reports and JSON output. Vibe Island and Open Island offer richer Mac-first control surfaces, while Agent Notch keeps setup deliberately light. The right choice depends on whether you need one five-provider status-and-usage view, deeper approvals, or terminal-grade reporting.