[macintux]

I've never felt comfortable with password strength tools online for similar reasons. Sure, most (maybe all) are local Javascript, but still.

[ehsankia]

Can you not monitor networking and make sure nothing is being sent back?

[macintux]

Sure, but it's a lot easier to just not use 'em.

[ehsankia]

Not really, these provide much needed help.

It's like saying, I'm gonna stick to Notepad and not use a proper IDE because I'm not sure if they send the code I write back to themselves.