🆚 Akismet vs. Cap
Statistics for Cap are still being collected and do not yet reflect its full market share.
Akismet
CapType
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.
Cap is an open-source, self-hosted 
reCAPTCHA alternative that verifies visitors without visual puzzles, tracking, or third-party services.
It uses a two-layer verification model that combines proof-of-work challenges accelerated with 
WebAssembly and Web Workers, including SHA-256 hashing and optional GPU-resistant time-locks.
Headquarters
San Francisco, California, United States
Lisbon, Portugal
Pricing
Free version ✔️ Personal use only
$14.95/month
Free ✔️ Open source
Categories
Popularity
Determined by the number of sites using each technology.
Total websites
Market share
Spam Protection
Popularity by country
Determined by the number of sites detected from each country.
United States
United Kingdom
Australia
Spain
Netherlands
Canada
France
Italy
Brazil
India
Awards
- 🥉 Third most popular in Vietnam in the Spam Protection category.
- 🥉 Third most popular in Iran in the Spam Protection category.
- ⭐ 4th most popular in Australia in the Spam Protection category.
- ⭐ 4th most popular in Russia in the Spam Protection category.
- ⭐ 4th most popular in Israel in the Spam Protection category.
Popularity by domain category
Determined by the number of sites in each category.
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.
Compare alternatives
Technologies with similar characteristics.
Cloudflare Email Obfuscation
hCaptcha
Cloudflare Turnstile
CleanTalk
Yandex SmartCaptcha
Altcha🗃️ About This Data
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 3,604,716 websites. However, data for Cap is still being collected and reflects a smaller subset of sites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.