🆚 Akismet vs. Altcha

📈 Akismet is much more popular than Altcha.
🌎 Akismet is more popular in the United States, the United Kingdom, and Australia.
🌍 Altcha is more popular in Iceland.

Statistics based on 3.5M+ analyzed websites. About this data

Akismet

Altcha

Type

Spam protection software

Captcha service

About

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

Altcha is 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.

It performs client-side computational challenges based on hashing and memory-hard algorithms such as Argon2 and Scrypt, adds headers and signatures for verification, operates without cookies, fingerprinting, or external requests, and supports more than 50 languages to meet accessibility and privacy requirements.

Headquarters

San Francisco, California, United States

Brno, Czech Republic

Website

akismet.com #119,026

altcha.org #175,575

Pricing

Free version ✔️Personal use only

$14.95/month

Free version ✔️Open source

ALTCHA Sentinel€99+/month

Popularity

Determined by the number of sites using each technology.

The Akismet spam protection software is 34 times more popular than Altcha.

Total websites

Market share

Spam Protection

Popularity by country

Determined by the number of sites detected from each country.

Akismet is more popular in the United States, the United Kingdom, and Australia, while Altcha is more popular in Iceland.

United States

United Kingdom

Australia

Spain

Netherlands

Canada

France

Italy

Germany

Brazil

Awards

🥉 Third most popular in Vietnam in the Spam Protection category.
🥉 Third most popular in Iran in the Spam Protection category.
🥉 Third most popular in Belarus in the Spam Protection category.
⭐ 4th most popular in the United States in the Spam Protection category.
⭐ 4th most popular in Australia in the Spam Protection category.

⭐ 4th most popular in France in the Captchas category.
⭐ 4th most popular in the United Kingdom in the Captchas category.
⭐ 4th most popular in the Czech Republic in the Captchas category.
⭐ 4th most popular in Poland in the Captchas category.
⭐ 5th most popular in Germany in the Captchas category.

Popularity by domain category

Determined by the number of sites in each category.

Akismet is more popular than Altcha in all market segments.

Business

Marketing/Merchandising

Blogs/Wiki

Internet Services

Health

Education/Reference

Non-Profit/Advocacy/NGO

Travel

Real Estate

Online Shopping

Top sites

Top-ranked sites that use these technologies.

Name

Rank

#1,888

#5,839

#6,016

#6,161

#7,606

Name

Rank

#5,726

#7,004

#8,664

#15,520

#23,074