ACDSee is an image organizer, viewer, and image editor programs for Windows, macOS and iOS. Developed by ACD Systems International Inc.
License: Commercial
FastStone Image Viewer is a free, user-friendly tool ideal for casual users who need basic editing and organizational features. In contrast, ACDSee is a comprehensive, professional-grade software that offers advanced features, cloud integration, and mobile access, making it suitable for photographers and serious users.