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Best Thunderbird Lightning Alternatives ranked by AI · updated May 2025
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An extension for Mozilla Thunderbird that adds calendar functionality.
Price: Free
Top 6 Thunderbird Lightning alternatives
VueMinder is a full-featured calendar and reminder program for Windows.
GNOME Calendar is a simple and intuitive calendar application for GNOME desktop environment.
Microsoft Outlook Calendar is a calendar tool integrated with the Outlook email and productivity suite. It allows users to schedule appointments, meetings,...
Included in Microsoft 365 subscription
Outlook CalDav Synchronizer is a free Outlook plugin that synchronizes events, tasks, and contacts between Outlook and CalDAV/CardDAV servers.
EVO Collaborator for Outlook is a Windows add-in that synchronizes Outlook contacts, calendars, tasks, and notes with services such as Google, iCloud,...
Pros
- Supports Google, iCloud, Yahoo, CardDAV, and CalDAV endpoints
- Synchronizes more Outlook data types than many single-purpose calendar tools
- Works inside the familiar Outlook desktop interface
Cons
- Windows and desktop Outlook focused, with no equivalent macOS add-in
- More technical to configure than native Outlook account integration
- Less widely documented and supported than CompanionLink or gSyncit
From $29.99 one-time
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