Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. Developed by KDE
License: Open Source
Google Contacts is a cloud-based service that seamlessly integrates with Google's ecosystem, making it ideal for users heavily invested in Google services. Kontact, on the other hand, is an open-source solution tailored for KDE users, offering more customization and privacy but with a steeper learning curve.