Best Spark Desktop Alternatives in 2025

Looking for alternatives to Spark Desktop? In this comparison, we take a closer look at Spark Desktop alongside similar software solutions including Spark Desktop, Mozilla Thunderbird, eM Client, Foxmail, Mailbird, Rainlendar Lite, Kalenderchen and Notion Calendar.

Our detailed comparison table highlights key features, pricing, and performance of these leading solutions, empowering you to make an informed decision. Whether you're seeking robust functionality, user-friendly design, or cost-effective alternatives, explore how Spark Desktop, Mozilla Thunderbird, eM Client, Foxmail, Mailbird, Rainlendar Lite, Kalenderchen and Notion Calendar stack up to find the perfect software for your goals.

Calendar Integration

Spark Desktop
Spark Desktop
No built-in calendar integration
Mozilla Thunderbird
Mozilla Thunderbird
Built-in calendar feature with integrated functionality
eM Client
eM Client
Integrated calendar module with synchronization
Foxmail
Foxmail
Built-in calendar and task manager
Mailbird
Mailbird
No calendar feature
Rainlendar Lite
Rainlendar Lite
Supports multiple calendar views and integrates with Google and Outlook calendars
Kalenderchen
Kalenderchen
Intuitive calendar interface supporting Google and Apple Calendar integration
Notion Calendar
Notion Calendar
Customizable calendar tool with integration to Google and Apple calendars

Email Account Support

Spark Desktop
Spark Desktop
Supports multiple email accounts with a unified inbox
Mozilla Thunderbird
Mozilla Thunderbird
Supports multiple email accounts with wide protocol support (IMAP, POP, SMTP)
eM Client
eM Client
Supports multiple email accounts with advanced management features
Foxmail
Foxmail
Supports multiple email accounts with efficient management
Mailbird
Mailbird
Supports up to three email accounts in free version; more in paid
Rainlendar Lite
Rainlendar Lite
Primarily a calendar app, not focused on email account support
Kalenderchen
Kalenderchen
Focused on calendar, not on email accounts
Notion Calendar
Notion Calendar
Part of Notion productivity app, integrates calendars but not an email client

Platform Availability

Spark Desktop
Spark Desktop
Available on Mac, iOS, Android, Windows with mobile and desktop versions
Mozilla Thunderbird
Mozilla Thunderbird
Cross-platform: Windows, Mac, Linux
eM Client
eM Client
Available on Windows and macOS
Foxmail
Foxmail
Available on Windows, MacOS, Android, iOS
Mailbird
Mailbird
Windows only
Rainlendar Lite
Rainlendar Lite
Windows, Mac, Linux with mobile app available separately
Kalenderchen
Kalenderchen
Windows and macOS; supports multiple platforms via synchronization
Notion Calendar
Notion Calendar
Available on web, iOS, Android platforms through Notion app

Pricing Model

Spark Desktop
Spark Desktop
Free application with some advanced features
Mozilla Thunderbird
Mozilla Thunderbird
Free and open-source software
eM Client
eM Client
Free version available; paid version with added features
Foxmail
Foxmail
Free application
Mailbird
Mailbird
Free limited version; paid version offers more features and accounts
Rainlendar Lite
Rainlendar Lite
Free version available; paid version for extra features
Kalenderchen
Kalenderchen
One-time purchase fee for premium application
Notion Calendar
Notion Calendar
Included in both free and paid Notion plans

Choosing the right software isn’t just about features. Size, license type, user ratings, and popularity also matter.

This quick comparison shows how Spark Desktop stacks up against Spark Desktop, Mozilla Thunderbird, eM Client, Foxmail, Mailbird, Rainlendar Lite, Kalenderchen and Notion Calendar in these key areas—helping you find the best alternative for your needs.