Anyone who's hit Claude's rate limit mid-conversation knows the frustration. Claude Tuner is a new Chrome extension that tracks your usage against Anthropic's rate windows and warns you before you get cut off.
The extension shows two gauge bars in your browser: one for the 5-hour usage window and one for the 7-day window that Anthropic uses to throttle heavy users. A countdown timer shows when each window resets. At 80% and 95% usage, you get alerts so you can pace yourself or switch to a different tool before hitting the wall.
The more interesting feature is plan optimization. After 14 days of tracking your usage patterns, Claude Tuner recommends whether you should upgrade, downgrade, or stay on your current plan. It works across Pro, Max 5x, Max 20x, Team, and Enterprise tiers. For teams, there's a paid dashboard ($20/user/month) with per-user tracking, usage leaderboards, and CSV/PDF exports.
The personal tier is free. The team features are where the developer, who goes by Chaehyun, plans to make money. The pitch to team managers: see which seats are over-provisioned and which engineers are constantly hitting limits, then right-size your plan accordingly.
It's a niche tool solving a real annoyance. Anthropic doesn't surface rate limit data clearly in their interface, so a third-party tracker fills a genuine gap. The main risk is the same as any browser extension that monitors your activity on a specific site - you're trusting a small developer with visibility into your usage patterns. The extension claims all data stays local, but that's worth verifying before installing.