Awais

Simple Spam Blocker use honeypot technique which is fast and easy way to prevent spam. This plugin can stop spam comments, spam registration and also can be used to stop bots to try to login into admin panel. This plugin also provide option to stop spammers to get register via Ultimate Memeber Plugin’s registration from. You can also use shortcode [simple-spam-blocker] on any form to stop spammers.

Simple Spam Blocker

Simple Spam Blcoker stop spam comments and also can be used to stop bots to try to login into admin panel.

keith_wp

Blocks spam signups by adding an invisible field to your registration and login forms, and switching its id with the real username or email form field.
When spam bots blindly fill the “required” fake field in, WP will redirect them to an error message and not let them register or login.
No 3rd party service, no intrusive captchas.

SpamPot

Adds a honeypot form field on the registration and login pages to trap spammers.

Simple Spam Blocker vs SpamPot