Download nowDownload nowProtect your accounts in real time by detecting weak and leaked passwords before they put you at risk.
Nautillo’s weak password checker is a real-time protection feature that identifies unsafe, commonly used, or breached passwords as you type them.
Unlike traditional tools, Nautillo doesn’t need to see your actual password. Instead, it uses secure hashed comparisons against a massive database of known leaked credentials. This means your privacy stays intact—while your security improves instantly.
With Nautillo (via Sonar, available in trial and paid plans), you get an extra layer of protection exactly where it matters most: during logins and sign-ups.
It automatically detects:
By warning you in real time, Nautillo helps you stop threats before they happen.
Here’s the uncomfortable truth: most cyberattacks don’t require advanced hacking. They rely on already leaked passwords.
When a data breach happens, millions — even billions — of credentials get exposed. These are then compiled into databases used by attackers for:
• Credential stuffing attacks
• Account takeovers
• Identity theft
• Financial fraud
If you’ve ever reused a password — even once — you could already be at risk.
Nautillo uses a privacy-first approach.
When you enter a password:
1. It is converted into a secure hash (not readable text)
2. That hash is compared against a database of known leaked passwordsIf there’s a match, Nautillo instantly warns you
3. Your actual password is never exposed, stored, or transmitted in plain text.
Billions of credentials are traded on cybercrime marketplaces daily.
Most tools require you to actively check your password.
Nautillo protects you passively, exactly when you need it.
Weak and leaked passwords are one of the easiest ways attackers gain access to accounts.
Nautillo eliminates that risk —silently, securely, and instantly.
If you care about your online safety, this isn’t optional anymore — it’s essential.
