🆚 Cap vs. reCAPTCHA
CapType
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.
reCAPTCHA is a Google service that protects websites from spam, fraud, and automated abuse by distinguishing human users from bots.
It offers several versions, including v2 with an "I'm not a robot" checkbox and an invisible badge and v3 with background risk scoring.
Headquarters
cloud.google.comPricing
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
- 🥇 Most popular in the United States in the Spam Protection category.
- 🥇 Most popular in the United States in the Captchas category.
- 🥇 Most popular in the United Kingdom in the Spam Protection category.
- 🥇 Most popular in the United Kingdom in the Captchas category.
- 🥇 Most popular in Spain 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
Friendly Captcha
Altcha
Google company profile🗃️ 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.