Free, always
Check a snippet for security issues
Two free ways to check Python code. The quick scan needs no account: a deterministic, zero-model pass over a fixed public checklist of textbook issues, instant, and the code never leaves the request. The essential security review runs the real Security (D6) judge, the one narrated in the worked example, on that single dimension. It needs a free account (that is the abuse boundary, not a paywall), it sends the snippet to the third-party judge (disclosed right at the button), and it stays free: no card, no expiring trial, a capped daily allowance so it stays fair for everyone.
Neither result is a certificate that the code is secure, and the quick scan is not the D6 judge. Read what each one actually checks before relying on either.