From my own personal experience, I don't like CAPTCHA when filling a form, especially encountering unrecognizable picture or calculation-required one.
When I submit some advises to the website, it's really annoying to fill a CAPTCHA at last. Always, I will give up my pulse to say something to the administrator or do some enquiries.
So here's the question. Does CAPTCHA really affect UX? And will a CAPTCHA-enabled contact form be disliked by users?
Answer
Yes, Captchas are still annoying. Even Stack Exchange, which has relatively few captchas compared to many other sites, gets a large number of complaints about their captchas.
It's becoming more common than when it was introduced (and at the same time maybe less common than it used to be, now that OpenID is becoming more popular) but it's still a significant hit to one's form-filling experience. And annoying someone right when they're signing up/otherwise about to breach a significant barrier is a great way to stop people who would have otherwise gone through to become customers. Every extra step you add will lose people, even moreso when the step is (intentionally) annoying.
And no captcha conversation is complete without noting how terrible "accessible" captchas are. Homebrewed captchas are often completely inaccessable to the blind, and audio captchas, when offered, are often vastly harder to solve. Try a few yourself. Also note most alternatives to captcha simply take longer than a captcha and are thus more annoying, and generally are no more accessible (at best).
Generally you should use a honeypot instead of a captcha and only consider additional methods if the honeypot isn't enough. OpenIDs are a good way to ensure you're getting a person (or at least a significantly smarter bot), but honeypots are more versatile since not every situation should require an open ID; certainly not for a contact form.
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