Mozilla Thunderbird

Mozilla Thunderbird is ranked #24 of 197 in calendar apps on The Geeks Club, made by Mozilla Thunderbird. It runs on Android, Linux, macOS, Windows. There is a free plan.

Mozilla Thunderbird plans and pricing

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Free Free Email, calendar, and contacts · Multiple account support · Open-source software thunderbird.net · 21 Sept 2026

Free forever Free thunderbird.net · 27 Sept 2026

Compared on calendar apps

Free plan: Yes
Mobile apps: Android

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9.3 Calendar.com Free plan

9.2 Teamup Free plan

9.0 Microsoft Outlook Calendar $1.67/mo

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9.0 FlowSavvy Free plan

9.0 EGroupware Free trial Open source€21.90/mo

Mozilla Thunderbird

Free plan: Yes
Unified inbox: Yes
Offline access: Yes
Scheduled sending: Yes
Calendar tools: Yes
Free Forever: Thunderbird is available free forever.
Open Source: Thunderbird is open source and freely licensed to use, modify, and share.
Desktop Platforms: The desktop app supports Windows, Linux, and macOS.
Mobile Platform: Thunderbird Mobile is an open-source email app for Android.
Email Management: Users can manage multiple email accounts separately or in a unified inbox.
Productivity Tools: Thunderbird includes calendar, contacts, and task management.
Ad Free: Thunderbird does not clutter the inbox with ads or commercials.
Donation Funded: Thunderbird is funded by user donations and says it does not sell inbox ads.
Privacy And Security: Thunderbird says privacy and security are prioritized as part of Mozilla.
Price from: Free

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Where it ranks on The Geeks Club

Best Calendar Apps in 2026#24 of 197
Best Email Clients in 2026#5 of 143

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Sources

thunderbird.net/en-GB/· checked 21 Sept 2026
thunderbird.net· checked 27 Sept 2026
thunderbird.net/en-GB/desktop/· checked 27 Sept 2026