🆚 Altcha vs. Cloudflare Email Obfuscation

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.

Cloudflare Email Address Obfuscation hides email addresses on web pages from bots by encrypting them.

Popularity

Determined by the number of sites using each technology.

• ⭐ 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 Kingdom in the Security category.
• 🥇 Most popular in Thailand in the Spam Protection category.
• 🥇 Most popular in Thailand in the Security category.
• 🥇 Most popular in India in the Security category.
• 🥇 Most popular in Canada in the Security category.

Top sites

Top-ranked sites that use these technologies.

Compare alternatives

Technologies with similar characteristics.

• Altcha vs. reCAPTCHA
• Altcha vs. hCaptcha
• Altcha vs. Cloudflare Turnstile
• Altcha vs. Friendly Captcha
• Altcha vs. MTCaptcha

• Cloudflare Email Obfuscation vs. reCAPTCHA
• Cloudflare Email Obfuscation vs. hCaptcha
• Cloudflare Email Obfuscation vs. Akismet
• Cloudflare Email Obfuscation vs. CleanTalk
• Cloudflare Email Obfuscation vs. BitNinja

• Altcha technology profile

• Cloudflare Email Obfuscation technology profile
• Cloudflare company profile