The NuCaptcha WordPress plugin is a critical feature for active websites. The feedback from our customers is that even when using other advanced spam filtering techniques, they still receive dozens or hundreds of spam comments every day. In some cases it is a full time job to manage the combination of legitimate and illegitimate messages received. There are many Captcha plugins available for WordPress, but unfortunately they tend to suffer from lack of maintenance, usability issues, or improper implementation.

For example, when you implement a Captcha system that generates Captchas directly off your webserver: The PHP code for generating these captchas is included in the plugin for anyone to read! This makes it even easier for attackers to write software to break your Captchas.

In addition, many available Captcha systems generate and serve Captchas from your web server, causing extra processing load and bandwidth. NuCaptcha, being a hosted service, takes the hit for bandwidth and processing load for you. Si-captcha is a Captcha system that you install and run off your webserver. For si-captcha, your server does all image generation, validation and serving of resources, which adds up quickly if you have 1000+ SPAM attempts a day. The NuCaptcha WordPress plugin interfaces with the NuCaptca platform through a remote API that fetches only the HTML required to render the NuCaptcha Player. The NuCaptcha platform handles everything else: Captcha generation, Captcha validation and serving of all resources. There is no workload on your web server.

NuCaptcha offers unparalleled security and usability, and is under active development to ensure it stays up to date with the latest WordPress releases.