Checking Kilo credits, OpenAI API balance, ChatGPT usage, and Claude limits used to mean switching among a collection of authenticated tabs and settings screens. AI Capacity Monitor keeps those displayed values in one local popup, with reset windows, freshness, and safe diagnostics beside each reading.

The extension reads only provider pages the user explicitly enables and never asks for credentials. It collects through its own pinned background tabs, so scheduled refreshes do not reload tabs the user is actively using. When a page is not ready, signed out, or structurally changed, it retains the last verified reading rather than fabricating a zero balance.

Built as a Manifest V3 Chrome extension with a constrained provider registry, fixture-tested extraction rules, optional per-provider permissions, and a versioned normalized snapshot contract. A local bridge or HTTPS webhook can publish derived readings to a separate dashboard or service, but the popup remains fully useful on its own.