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Ask HN: Whats the best captcha service

5 points by webstartupper ↗ HN
My website is being bombarded by registration spam and as much as I don't like to do it, I will have to setup a captcha to stop the automated registrations. I know the captcha will have some effect on the conversion rate for real users - but I don't think this can be avoided.

What do you guys think is the best captcha service which does not add too much of a barrier to user registrations?

7 comments

[ 3.6 ms ] story [ 30.1 ms ] thread
dotmanish
You may try Google's reCAPTCHA.
varunkho
Please please don't use google recaptcha at least for audio, it is completely unintelligible [0]. I think speech parsing is an easy problem compare to CV for computers that's why recaptcha audio has been made difficult to the point that both (or at least) human and computer alike cannot understand it. Machines have passed turing Test in speech it seems.

[0]: https://groups.google.com/forum/?fromgroups#!topic/recaptcha...

Edit: Never assume that a person with audio recaptcha need would not be visiting your site; people with different needs are more daring and frequent on internet than in real world.

ozh
Anything but reCaptcha. I'm pretty sure I'm a completely legit human, yet I can't decypher recaptcha 95% of the time. This is the biggest turn down of the whole interweb.
Meltdown
Just use a a challenge/response question.

What is the hottest season? What is the coldest season? Capital city of the UK? What are the last three letters of the capital city of the UK?

.. and so on.

Better still to select a question specific to your usergroup.

Regards Melt