onWatch is a free, open-source CLI tool that tracks Synthetic, Z.ai, and Anthropic (Claude Code) API quota usage in real time.
Cost / License
- Free
- Open Source (GPL-3.0)
Platforms
- Mac
- Linux
- Windows
- Docker




CapMeter is described as 'A macOS menu bar app that shows your Claude usage and turns your burn rate into a countdown, so you know when you'll hit the limit before you do' and is an app in the ai tools & services category. There are more than 10 alternatives to CapMeter for a variety of platforms, including Mac, Microsoft Edge, Google Chrome, Brave and Chromium apps. The best CapMeter alternative is onWatch, which is both free and Open Source. Other great apps like CapMeter are UsageFleet, AIQuotaBar, CodeQuota and Claude Usage.
onWatch is a free, open-source CLI tool that tracks Synthetic, Z.ai, and Anthropic (Claude Code) API quota usage in real time.







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