🆚 Cap vs. CleanTalk
Cap
CleanTalkType
About
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.
CleanTalk is a cloud-based anti-spam service that protects websites from automated spam in online forms, comments, and registrations.
It analyzes form data and behavioral signals to identify spam, blocks requests from known spam sources before they reach the website, and integrates with 
WordPress, 
Joomla, 
Drupal, 
WooCommerce, and 
Magento.
Headquarters
Pricing
Categories
Popularity
Determined by the number of sites using each technology.
Market share
Popularity by country
Determined by the number of sites detected from each country.
Awards
- ⭐ 5th most popular in the United Kingdom in the Spam Protection category.
- ⭐ 5th most popular in Russia in the Spam Protection category.
- ⭐ 5th most popular in Switzerland in the Spam Protection category.
- ⭐ 5th most popular in Denmark in the Spam Protection category.
- ⭐ 5th most popular in Poland in the Spam Protection category.
Popularity by domain category
Determined by the number of sites in each category.
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
hCaptcha
Cloudflare Turnstile
Yandex SmartCaptcha
Altcha
Cloudflare Email Obfuscation
Akismet🗃️ 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.