If you use Claude daily, you've probably hit a wall mid-task. The reason it's so easy: Claude doesn't have one limit. It has several. And the weekly pool is sneaky: Fable has no cap of its own and draws that shared pool down ~2× faster than Opus. So you can burn the week without realizing it.
I wanted that state visible at a glance instead of digging through settings, so I built Claude Usage Monitor — a small browser extension for Chrome and Firefox.
It puts a color-coded % badge in your toolbar, and one click shows the full breakdown:
It's open source (MIT) and runs 100% locally — no backend, no analytics, no servers.
A design decision I'm happy with: the host permissions are scoped to exactly four claude.ai endpoints (org list, usage stats, routine-run budget, prepaid balance). It physically can't read your chats, projects or files. Narrow permissions = less to trust, and less to exploit.
One honest caveat: it reads claude.ai's own usage endpoints, so it can break if Anthropic changes them. Not affiliated with Anthropic.
It's free, no account needed (desktop Chrome & Firefox): Happy to hear what else you'd want tracked — drop a comment.