Malwarebytes is available in both a free and a paid version.

Malwarebytes scans in batch mode, rather than scanning all files opened, reducing interference if another on-demand anti-malware software is also running on the computer. Malwarebytes is primarily a scanner that scans and removes malicious software, including rogue security software, adware, and spyware. It is available in a free version, which scans for and removes malware when started manually, and a paid version, which additionally provides scheduled scans, real-time protection and a flash-memory scanner. Made by Malwarebytes Corporation, it was first released in January 2006. Malwarebytes (formerly Malwarebytes Anti-Malware, abbreviated as MBAM) is an anti-malware software for Microsoft Windows, macOS, ChromeOS, Android, and iOS that finds and removes malware. Bulgarian, Catalan, Chinese (Traditional), Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian, Slovak, Slovene, Spanish, Swedish, Turkish and Vietnamese

Is malwarebytes a good antivirus