eM Client vs Mozilla Thunderbird

eM Client brings email and productivity tools together on Windows, macOS, Android, and iOS. Its unified inbox accompanies calendar, tasks, contacts, notes, and chat, with offline access, scheduled sending, calendar tools, and online-meeting integration. It supports Google Workspace, Office 365, Outlook, and Exchange, and provides PGP and S/MIME message encryption. Integrations include Teams, Slack, and Rocket.Chat. The Free plan allows two email accounts on one device and costs nothing; registration is required. Personal costs $39.95 a year and permits unlimited email accounts on up to three devices. Business costs $49.95 a year. One-time options are also listed: Personal Lifetime is $59.95, paid once, and Business Lifetime is $79.95, paid once. Android and iOS versions are free to use without a license. Support options include a user forum and VIP Support. The maker is based in Prague, Czech Republic, and lists a 30% discount for NGOs, schools, and universities.

Mozilla Thunderbird is a free, open-source email application for Windows, Linux, macOS, and Android. Users can manage multiple accounts separately or combine them in a unified inbox. The app includes calendar, contacts, and task tools; desktop users can also work offline and schedule messages. Its interface is customizable, and it supports third-party add-ons. Thunderbird says it does not put ads in the inbox or sell inbox advertising, and that user donations fund the project. It describes privacy and security as priorities and says its open-source code has been reviewed and improved over 20 years. The application is part of MZLA Technologies Corporation, owned by Mozilla.org. Help and getting-started resources are available for desktop and mobile users, with contributors around the world supporting the project. Thunderbird is available free forever, with donations optional; its listed mobile platform is Android.