What is OpenDNS?
OpenDNS is a high-tech company based in San Francisco that provides easy-to-implement Internet navigation and Web security solutions for families, schools, governmental organizations and businesses of all sizes. The services provided by OpenDNS increase the speed of navigating websites and prevent unintended access to phishing and malware sites as well as to any Web content that you configure to be restricted.
What is ClearCloud?
ClearCloud is a service that provides safe and reliable web browsing by preventing you from going to websites that are known to perform malicious activity. It's like having a GPS in your car that won't let you turn down a street with known criminal activity.
Both use for preventing from malicious sites & activities. isn't it?