Side by Side Comparison of: Qihoo 360 vs Piriform vs AVAST Software s.r.o. vs Qihoo

Full Check - Check the overall condition of the computer with a simple click

Virus Scan - Integrating 5 award-winning antivirus engines ensuring the best protection

Speedup - Boost up the performance of the computer by optimizing the usage of programs

Cleanup - Free disk space by removing junk files and plugins you select

Tool Box - Wifi Security, Sandbox, Patchup

Be safer online: Advertisers and Web sites track your behavior online with 'cookies' that stay on your computer. CCleaner erases these cookies so any browsing you do stays confidential.

Reduce crashes: The Registry stores Windows settings. Over time, it can become cluttered and filled with errors, and can lead to crashes. CCleaner clears out the clutter so your PC is more stable.

Speed up your startup: Many programs run silently in the background when you start your PC. CCleaner helps you get to work - or play - faster by letting you disable unneeded programs.

Easy to use: If you can use email, you can use CCleaner. It's point-and-click, and you decide what to clean and what to keep.

Lightweight and dependable: easy-to-use, enhanced protection for an unpredictable online world.

Unrivaled online protection

Lighter, Cloud-based scans

New! Now with an extra layer of ransomware security

Intuitive, easy-to-use UI

The FREE antivirus software chosen by more than 540 million people

One click to get more space, speed and security

Easy-to-use User Interface for everyone

Real-time Protection stops virus and malware even before they reach your PC