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Jun 5th, 2025

15 Popular Sites Like Captcha

We've researched the internet and identified a lot of noted security and spam sites like Captcha. So come and view other websites that are similar to Captcha.

Displaying 11 to 20 of 460 alternatives to Captcha. (Updated: Jun 5th, 2025)     [about these results]
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You're looking for other sites like Captcha:
  The Official CAPTCHA Site
Working on a program that can generate and grade tests that most humans can pass, but which current computer programs fail.
http://www.captcha.net/
popularity:
captcha
security
spam
web
programming
internet
ai
software
webdesign
tools
new search by a custom tag signature
  TrustedSource - Internet reputation system
No information avaiable
similarity:
popularity:
spam
security
email
internet
tools
reputation
reference
network
dns
web
  Internet Security | WOT Web of Trust
WOT is an Internet browser security add-on that warns users about risky websites to help them avoid spyware, browser hijacking, identity theft, phishing, and other ...
similarity:
popularity:
security
firefox
tools
internet
web
trust
extension
web2.0
software
social
  Website Security, and Web Application Security News
Examines and patches security holes that port 80 may bring to a webserver.
similarity:
popularity:
security
web
internet
news
application
network
hacking
development
howto
programming
  Tor: anonymity online
Ensemble d'outils open source permettant d'améliorer la confidentialité et la sécurité des échanges sur Internet en les routant sur une chaîne de proxy et les ...
similarity:
popularity:
security
privacy
proxy
anonymity
internet
software
tools
tor
anonymous
web
  GRC | Gibson Research Corporation Home Page
Publishes the SpinRite hard disk utility and the ChromaZone screen saver construction set. Also offers a tool to test the security of a computer's Internet connection.
similarity:
popularity:
security
tools
software
internet
firewall
windows
computer
network
utilities
tech
  skipfish - Project Hosting on Google Code
No information avaiable
similarity:
popularity:
security
google
web
testing
tools
scanner
opensource
software
webdev
audit
  PHPIDS » Web Application Security 2.0
Welcome to php-ids.org - here you can find a collection of resources relating to PHPIDS including files, documentation, a friendly forum and a cool demo that shows ...
similarity:
popularity:
php
security
ids
programming
web
development
xss
software
tools
hacking
  Insecure.Org - Nmap Free Security Scanner, Tools & Hacking resources
Security tools, exploits, reading, and links from Fyodor.
similarity:
popularity:
security
hacking
tools
network
software
nmap
sysadmin
internet
linux
networking
  SpamCop.net - Beware of cheap imitations
Respond to spammers via this application that parses offending email and composes a message for you to send to the site of origin's network administrator.
similarity:
popularity:
spam
email
antispam
security
internet
tools
mail
web
blacklist
spamcop
  Anonymous proxy servers, by Anonymizer, hide IP addresses for surfing anonymously.
Enables anonyomous Web surfing through an intermediary to prevent unauthorized parties from gathering your personal information.
similarity:
popularity:
security
privacy
anonymous
tools
web
proxy
internet
software
anonymizer
computer
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How moreofit Searches
Each website has a unique tag signature -- a set of words that users have described the website as. Moreofit searches for websites that have similar tag signatures and displays the results.
1: Similarity
A site's "similarity" is determined by how well its tag signature matches the tag signature that is being searched for. A 100% match means that it has the exact same tags in the exact same order, while a 0% match means it has no tags in common.
2: Popularity
The popularity of a website is, well, pretty much self explanatory.
3: Tag Signature
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