# I built a free extension to track Claude's usage limits before you hit them > Source: > Published: 2026-06-13 18:46:45+00:00 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.