K7 Ultimate Security is an antivirus software by K7 Computing that protects PCs, laptops, and mobile devices against viruses, malware, ransomware, and phishing across Windows, macOS, Android, and iOS. Beyond real-time scanning, it offers Safe Surf web filtering, webcam and microphone protection, data locker encryption, ad blocking, parental controls, and anti-theft tracking for mobiles. System utilities including memory booster, file shredder, duplicate finder, and tune-up tools keep devices fast while backup features safeguard data.