How to track AI token usage before the expensive session is already over.

The most useful measurement is not just a daily total. It is the rate at which usage is climbing during an active session. That tells you whether the prompt or editor tool behavior is getting worse while you still have time to fix it.

OpenAI, Claude, Cursor, and similar tools all produce usage that can look normal until repeated requests or long sessions quietly compound. Live visibility helps because it makes those changes feel immediate instead of abstract.

A billing page is good for totals. It is not a good intervention tool. Once the session is over, the important context is gone: which prompt expanded, which request path kept firing, and which editor request kept growing.

That is why the ideal place for token visibility is closer to the work itself. If the signal shows up in the same environment where you are debugging, it becomes something you can act on.

TokenBar is designed as a local-first macOS menu bar app so the signal stays present without turning into another dashboard habit. It is meant to help developers keep OpenAI, Claude, supported Cursor workflows, and mixed provider sessions legible while they are still running.

If you want the practical next step after reading this, compare the dedicated OpenAI, Claude, and Cursor pages or follow the installation guide.