|
Mollom |
Akismet |
Defensio |
Company |
Mollom |
Automattic |
Websense Inc. |
When in doubt, use CAPTCHA? |
Yes |
No |
No |
Protect user registrations |
Yes, on some platforms |
No |
No |
Supported platforms |
Drupal, Joomla!, WordPress, and others |
WordPress and others |
WordPress and others |
Multiple language support |
Yes |
Yes |
Yes |
Commercial partners |
Yes |
No |
Yes |
Developer API |
Yes |
Yes |
Yes |
CAPTCHA support |
Yes |
No |
No |
Reputation tracking |
Yes |
Unknown |
Yes |
Highly-available back-end network |
Yes |
Unknown |
Yes |
Ability to retain spam for manual moderation |
Yes2 |
Yes |
Unknown |
Protection for new user registrations, lost password requests, etc. |
Yes2 |
Unknown |
Unknown |
Protection for custom and site-wide forms |
Yes2 |
Unknown |
Unknown |
Hidden honeypots to trap spam bots |
Yes2 |
Unknown |
Unknown |
Support and feedback |
Yes |
Yes |
Yes |
Security protocol |
HMAC |
None |
None |
Free for personal use |
Yes1 |
Yes |
Yes |
Free for commercial use |
Yes1 |
No |
Yes |