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
|
No built-in calendar integration |
![]() Mozilla Thunderbird
|
Built-in calendar feature with integrated functionality |
![]() eM Client
|
Integrated calendar module with synchronization |
![]() Foxmail
|
Built-in calendar and task manager |
![]() Mailbird
|
No calendar feature |
![]() Rainlendar Lite
|
Supports multiple calendar views and integrates with Google and Outlook calendars |
![]() Kalenderchen
|
Intuitive calendar interface supporting Google and Apple Calendar integration |
![]() Notion Calendar
|
Customizable calendar tool with integration to Google and Apple calendars |
Email Account Support
![]() Spark Desktop
|
Supports multiple email accounts with a unified inbox |
![]() Mozilla Thunderbird
|
Supports multiple email accounts with wide protocol support (IMAP, POP, SMTP) |
![]() eM Client
|
Supports multiple email accounts with advanced management features |
![]() Foxmail
|
Supports multiple email accounts with efficient management |
![]() Mailbird
|
Supports up to three email accounts in free version; more in paid |
![]() Rainlendar Lite
|
Primarily a calendar app, not focused on email account support |
![]() Kalenderchen
|
Focused on calendar, not on email accounts |
![]() Notion Calendar
|
Part of Notion productivity app, integrates calendars but not an email client |
Platform Availability
![]() Spark Desktop
|
Available on Mac, iOS, Android, Windows with mobile and desktop versions |
![]() Mozilla Thunderbird
|
Cross-platform: Windows, Mac, Linux |
![]() eM Client
|
Available on Windows and macOS |
![]() Foxmail
|
Available on Windows, MacOS, Android, iOS |
![]() Mailbird
|
Windows only |
![]() Rainlendar Lite
|
Windows, Mac, Linux with mobile app available separately |
![]() Kalenderchen
|
Windows and macOS; supports multiple platforms via synchronization |
![]() Notion Calendar
|
Available on web, iOS, Android platforms through Notion app |
Pricing Model
![]() Spark Desktop
|
Free application with some advanced features |
![]() Mozilla Thunderbird
|
Free and open-source software |
![]() eM Client
|
Free version available; paid version with added features |
![]() Foxmail
|
Free application |
![]() Mailbird
|
Free limited version; paid version offers more features and accounts |
![]() Rainlendar Lite
|
Free version available; paid version for extra features |
![]() Kalenderchen
|
One-time purchase fee for premium application |
![]() 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.
Size
![]() Spark Desktop
|
132MB |
![]() Mozilla Thunderbird
|
32.5MB |
![]() eM Client
|
47.3MB |
![]() Foxmail
|
20.3MB |
![]() Mailbird
|
5.4MB |
![]() Rainlendar Lite
|
42.8MB |
![]() Kalenderchen
|
3.1MB |
![]() Notion Calendar
|
License
![]() Spark Desktop
|
Freeware |
![]() Mozilla Thunderbird
|
Open Source |
![]() eM Client
|
Commercial |
![]() Foxmail
|
Freeware |
![]() Mailbird
|
Freeware |
![]() Rainlendar Lite
|
Freeware |
![]() Kalenderchen
|
Freeware |
![]() Notion Calendar
|
Freeware |