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Free · paid from $20/mo US · checked Sep 30
Usage tracker
Claude Counter
Browser extension for claude.ai that shows a token count against the context limit, a cache countdown and session and weekly usage bars.
- Author
- pauljones0
- Works with
- Claude app (claude.ai)
- License
- MIT
- Documented
- Oct 28, 2026
What Claude Counter is
Claude Counter adds widgets inside the claude.ai composer: an approximate token count for the current conversation against a 200k context limit, a live cache countdown and session (five-hour) and weekly (seven-day) usage bars with reset timers. It wraps window.fetch to read Claude's own traffic read-only, parses message_limit events and reads only the lastActiveOrg cookie to query the /usage endpoint. Available for Firefox, Chrome and Edge, and as a userscript.
What it does
- Approximate token count against the 200k context limit
- Live prompt-cache countdown
- Session and weekly usage bars with percentages and reset timers
When to use it
Good fit
- You chat on claude.ai in a browser and want the limits next to the composer
Not for
- Claude Code or the desktop app
How to install Claude Counter
You need: Firefox, Chrome or Edge
- Firefox: install from Firefox Add-ons (addons.mozilla.org/addon/claude-counter)
- Chrome or Edge: download the zip from GitHub Releases and load it unpacked in developer mode
- Or use the userscript from the userscript folder
Permissions and security
What it can access
- Wraps window.fetch on claude.ai to read traffic; reads the lastActiveOrg cookie
Security notes from the maintainers
- All processing is local; requests go only to claude.ai, per the README
Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.
Limitations
- Token count is approximate
Tools it extends
Frequently asked questions
Is Claude Counter available for Chrome?
Yes, as a zip from GitHub Releases loaded in developer mode; the store listing is Firefox only.
What data does Claude Counter read?
It wraps window.fetch on claude.ai read-only, parses message_limit events from the stream and reads only the lastActiveOrg cookie to query the /usage endpoint; processing is local.
How accurate is the token count?
The README calls it approximate; it is shown against a 200k context limit.
Sources and gaps
- https://github.com/pauljones0/claude-counter readme, checked Oct 28, 2026
- https://addons.mozilla.org/addon/claude-counter/ store, checked Oct 28, 2026