🆚 Altcha vs. reCAPTCHA
- 📈 reCAPTCHA is much more popular than Altcha.
- 🌍 reCAPTCHA is more popular in all countries.
- ⭐ Altcha is particularly popular in Germany.
Altcha
reCAPTCHAType
About
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.
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
- ⭐ 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.
- 🥇 Most popular in the United States in the Captchas category.
- 🥇 Most popular in the United States in the Spam Protection category.
- 🥇 Most popular in the United Kingdom in the Captchas category.
- 🥇 Most popular in the United Kingdom in the Spam Protection category.
- 🥇 Most popular in Spain in the Captchas 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
Friendly Captcha
Human Presence
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 3,511,995 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.