Monthly subscription, not tokens - no API keys, no per-token bills, nothing to configure. No limits on debugging sessions; there's a fair-use ceiling on AI volume, set well above normal bench work.
It is a desktop app - your whole debugging log (measurements, verdicts, hypotheses, rework) stays on your machine. YProbe server does not store anything of your project - only some summary, like what was wrong and how it was fixed, if you wish to share this.
The project file is also stored locally - you can reopen it any time whatever your subscription is doing.