If you are looking for a simple-but-effective solution to eliminate the spam, this Antispam Bee will be the right tool for you. No captchas, no API, no Ads and most importantly, free. You can block or allow comments in a certain language from certain countries. Also, it also provides you with full statistics so that you have an awareness about what you are doing. There are lots of other amazing features that support you in your fight with spam.
Another useful plugin you should try is Anti-spam. This easy-to-use plugin helps you block automatic spam in the Comments section. You can find these blocked comments in Spam area and convert any blocked comment to a regular comment easily.
Unlike other anti-spam plugins, this WPBruiser plugin keeps your site not only spam free but also faster and more secure. Based on algorithms to identify spam bots, this plugin prevents and detects spam from leaving them in the first place and that's all; you do nothing. How amazing it is!
The last candidate in this collection is the Spam protection by CleanTalk. This plugin offers you tons of awesome features that allow you to prevent different types of spam such as comments, spam registrations, spam emails and more. Besides, this plugin also improves your site's loading performance that is crucial in SEO, conversion and user experience.
Although this plugin comes with a free trial and after that, you need to pay an amount of $8 per year, it is worth a try to make your site cleaner and more professional.
These are top 5 free anti-spam plugins you should try. Furthermore, don't hesitate to share your favourite plugin in the comment section below.