Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.



Sblam! is described as 'Open-source implementation of server-side spam filtering of blog comments and forum posts' and is a Anti-Spam tool in the development category. There are more than 10 alternatives to Sblam! for a variety of platforms, including Web-based, Self-Hosted, Wordpress, SaaS and PHP apps. The best Sblam! alternative is Cap Captcha, which is both free and Open Source. Other great apps like Sblam! are reCAPTCHA, IronWall, Antispam Bee and hCaptcha.
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.



reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.


Say Goodbye to comment spam on your WordPress blog or website. Antispam Bee blocks spam comments and trackbacks effectively, without captchas and without sending personal information to third party services. It is free of charge, ad-free and 100% GDPR compliant.

hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.



mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.




Your favorite and most trusted "one stop shop" for the prevention of forum & blog spam, trusted by over 200,000 forums...
It allows you to filter and search for spammer comments on your channel and other's channel(s) in many different ways AND delete/report them all at once (see features below).




Anti-Spam Features. CleanTalk protects your website from spam bots and spam in Comments, Orders, Widgets, Registrations, Bookings, And any custom web form, Contact Emails, Subscriptions, Checks the existing comments and users for spam.



