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Two answers, no account.
Both run inside the request. Nothing you paste is stored — not in a database, not in a log, not in analytics.
Advisory check
Are you inside the range?
Paste an advisory identifier and the version you run. You get one of three answers — affected, not affected, or version unknown — and the reason.
Stack scan
What would tomorrow's brief say?
Paste a dependency file. We read it inside the request, resolve what we can, and show you the shape of a morning — how many items, and how many are yours.
Read inside the request. Never written to a database, a log, or analytics.