O&O Defrag is a Windows defragmentation utility. Developed by O&O Software GmbH
License: Commercial
O&O Defrag offers more advanced features such as real-time and deep defragmentation, making it suitable for users with heavy workloads, while Condusiv Diskeeper focuses on automatic background optimization and is lighter on system resources. Both applications support SSDs and provide user-friendly interfaces, but O&O Defrag provides more customization and detailed reports.