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Estimate password guess counts, attack times, common patterns, and practical improvement guidance with zxcvbn.
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How it works
Important
Use these utilities for development, learning, and local checks. Do not treat a browser tool as a replacement for audited identity systems, password managers, production key management, or server-side authentication controls.
Practical details
The pinned zxcvbn estimator recognizes dictionary words, names, dates, repeats, sequences, keyboard paths, and substitutions, then reports conservative guess counts across four attack-rate scenarios without transmitting the password.
Lucaden performs this task in the browser so the source stays under your control. The result is created only after you request it, and nothing is saved to a Lucaden account by this tool.
Questions
No. Reused, leaked, or predictably constructed passwords can still be unsafe. Use unique credentials and multifactor authentication.
No. Avoiding a network request keeps the password local, but it also means this tool cannot tell whether the exact value has appeared in a breach.
Open-source foundations
Lucaden documents its standards sources, architectural references, and permissive runtime dependencies while keeping this workspace consistent with the Lucaden interface.