🆚 Altcha vs. Cloudflare Email Obfuscation
Cloudflare Email Obfuscation is much more popular than Altcha.- Cloudflare Email Obfuscation is more popular in all countries.
Altcha is particularly popular in Germany.
Type
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.
Cloudflare Email Address Obfuscation is a Cloudflare Scrape Shield security feature that encrypts email addresses in 
HTML to hide them from harvesting bots and keep them visible and clickable for human visitors.
It automatically detects and obfuscates visible email addresses, uses a non-render-blocking 
JavaScript decoder to restore them for human users, distinguishes bot and human traffic, and supports global or API toggling and exclusions for specific addresses or HTML tags.
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
- ⭐ 4th most popular in the Netherlands in the Captchas category.
- ⭐ 4th most popular in France in the Captchas category.
- ⭐ 4th most popular in Switzerland in the Captchas category.
- ⭐ 5th most popular in Germany in the Captchas category.
- ⭐ 5th most popular in the United States in the Captchas category.
- 🥇 Most popular in the United States in the Security category.
- 🥇 Most popular in the United Kingdom in the Security category.
- 🥇 Most popular in Thailand in the Security category.
- 🥇 Most popular in Thailand in the Spam Protection category.
- 🥇 Most popular in India in the Security 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.
🗃️ 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 4,046,631 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.