⚡ Spam Protection

Anti-spam software is a variety of tools that protect websites from automated bots and malicious content.

These solutions often use challenge-response tests, content scanning, email obfuscation, and behavioral analysis to distinguish real users from automated threats.

According to our statistics, spam protection software is used on 16.2% of all websites.
89.6% of these sites use only one spam protection software solution, 9.4% use two, and 1.1% use three or more simultaneously.

⭐ Most Popular in 2026

The following chart shows the leading spam protection software in 2026, based on market share.

The most popular is reCAPTCHA with a substantial share of 57.4%, followed by Cloudflare Email Obfuscation with 28.8% and hCaptcha with 13.8%.

🚀 Country Highlights

Here is a list of software that is especially popular in certain countries.
Differences between global and country rankings are shown in parentheses.

✨ Best Spam Protection Software

Below is a more detailed list of 17 spam protection software solutions we detect, ranked by their market share.

RankNameMarket share
1
reCAPTCHA
Mountain View, California, United States

A Google service that protects websites from spam, fraud, and automated abuse by distinguishing human users from bots.

Free tier$8+/month
2
Cloudflare Email Obfuscation
San Francisco, California, United States

Cloudflare Email Address Obfuscation hides email addresses on web pages from bots by encrypting them.

Free$25+/month
3
hCaptcha
San Francisco, California, United States

A security service for detecting and preventing human and automated abuse on websites and applications, often used as a drop-in alternative to reCAPTCHA.

Free$99+/month
4
Cloudflare Turnstile
San Francisco, California, United States

A user-friendly CAPTCHA alternative that verifies human visitors without requiring them to solve interactive puzzles or identify objects.

Free$$$
5
Akismet
San Francisco, California, United States

A comment spam filtering service originally developed for WordPress that can also be integrated with other CMS and forums.

Free$14.95/month
6
CleanTalk
Carson City, Nevada, United States

A cloud-based anti-spam protection service that protects websites from spambots.

$12+/year
7
Friendly Captcha
Woerthsee, Germany

A European captcha service that protects websites from bots and automated abuse while prioritizing user privacy, security, and accessibility.

Free€9+/month
8
Yandex SmartCaptcha
Moscow, Russia

A captcha service from the Russian company Yandex.

Free tier$0.80
9
Altcha
Brno, Czech Republic

An open-source, privacy-first, self-hosted captcha alternative that uses a proof-of-work mechanism to protect websites, APIs and online services from spam and unwanted content.

FreeOpen source€24+/month
10
GeeTest
Wuhan, China

A Chinese provider of CAPTCHA and bot management solutions.

$$$
11
Tencent Captcha
Shenzhen, China

Provides web and app developers with comprehensive human verification services through slider CAPTCHAs.

Free tier$0.005+
12
MTCaptcha
Mountain View, California, United States

A GDPR and WCAG compliant enterprise captcha service.

Free tier$29+/month
13
BitNinja
Debrecen, Hungary

A server security suite with a centralized dashboard containing an AI-powered Linux malware scanner, IP reputation, WAF, and spam detection.

Free$5+/month
14
Yidun Captcha
Hangzhou, China

A captcha service provided by the Chinese company NetEase.
15
Human Presence
Greenville, South Carolina, United States

Web security software that identified human website visitors through human behavior analysis and proprietary machine learning algorithms.

Free$3.99+/month
16
Castle
New York, United States

A fraud prevention platform that helps businesses block bad bots, account takeovers, transaction fraud, and spam.

Free$200+/month
17
Vaptcha
China

A new type of human-machine verification solution based on AI and Big Data.

Free$$$
Data is based on the analysis of 3,176,795 websites.
Statistics were last calculated on .
For details, see our methodology and disclaimer.