Developer builds open-source browser extension to predict Claude AI usage limits

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A developer created a free, open-source browser extension called Claude Usage Companion after being unexpectedly cut off mid-task by Claude's session limit with no prior warning. Claude's paid plans enforce both a 5-hour session window and a 7-day weekly cap, shared across claude.ai and Claude Code, with usage data visible in settings but no real-time depletion forecast. The extension intercepts internal API calls and server-sent events from Claude's chat stream to gather live utilization data without scraping page HTML, making it more resilient to frontend redesigns. Using two Chrome scripts — one in the page's main world to capture network data and one in an isolated world to relay it — the tool calculates a projected time when the session limit will be reached at the current usage pace. All data remains on the user's device, and the extension displays a single actionable estimate such as 'session runs out at 3:50 PM' so users can adjust their workflow before hitting the wall.

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