[klearvue]

We use honeypot field and timegate trap on our site forms - so far very successfully.

[bbrizzi]

I know what a honeypot (fake field that only bots fill out) but what's a timegate trap? Googling didn't bring up anything relevant.

Does it check how long it took the user/bot to fill up the form and dismisses it if it was too fast?

[borplk]

yes as far as I know you got it right, you somehow keep track of when the form was presented to the user and compare that with the current time when a response comes in

[olalonde]

While this may defeat naive bots, it certainly won't be defeat bots that target your site specifically so I wouldn't say it qualifies as an alternative to CAPTCHAs.