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Instead of Mozilla Thunderbird
Mozilla Thunderbird alternatives
Mozilla Thunderbird is a free, open-source app for managing email across multiple accounts, either separately or in a unified inbox. It works on Windows, Linux, macOS, and Android, and includes offline access, scheduled sending, a calendar, contacts, and tasks. Its customizable interface and third-party add-ons give users ways to adapt the app, while Thunderbird says it is ad-free and funded by donations.
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Microsoft Outlook Calendar
by Microsoft Outlook CalendarFree plan AndroidiPhoneMac+1Outlook email and calendar across web and mobile — Outlook adds shared calendars and video meeting support, while Thunderbird offers unified email, offline access, and scheduled sending.
Free plan · paid from $9.99/user/mo · 30-day trial Visit site - 2
Tuta Calendar
by Tuta CalendarFree plan AndroidiPhoneLinux+3Appointments, meetings, and repeating tasks — Tuta Calendar focuses on appointments, business meetings, and repeating tasks, unlike Thunderbird’s combined email and calendar app.
Free plan · paid from €3/user/mo Visit site - 3
Lark
by LarkFree plan AndroidAPIiPhone+4Workplace communication and collaboration — Lark combines chat, calendar, document creation, and cloud storage, while Thunderbird centers on email with calendar, contacts, and tasks.
Free plan Visit site - 4
EGroupware
by EGroupwareFree plan Open source AndroidAPIiPhone+5Open-source shared calendar and video meetings — EGroupware offers shared calendars, two-way calendar sync, and video meetings, while Thunderbird includes email, contacts, tasks, and offline access.
Free plan · paid from €21.90/mo · 30-day trial Visit site - 5
Zoho Calendar
by Zoho CalendarFree plan AndroidiPhoneWebScheduling links and time blocking — Zoho Calendar adds time blocking, scheduling links, shared calendars, and two-way sync rather than Thunderbird’s broader email and task features.
Free plan Visit site - 6
Proton Calendar
by Proton CalendarFree plan AndroidiPhoneMobile calendar with shared scheduling — Proton Calendar provides shared calendars and scheduling links on Android and iOS, while Thunderbird also supports desktop systems and email.
Free plan Visit site - 7
Teamup
by TeamUpFree plan AndroidAPIiPhone+4Shared calendars and time blocking — Teamup focuses on shared calendars and time blocking, while Thunderbird combines email, calendar, contacts, and tasks.
Free plan · paid from $12/mo (annual) · 3-day trial Visit site - 8
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Avidemux
Free plan Open source LinuxMacWeb+1 - 11
Iceraven
Free plan Open source Android - 12
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Spike
Free plan AndroidiPhoneMac+2 - 18
Canary Mail
Free plan AndroidiPhoneMac+1 - 19
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Epistles Mail
Free plan AndroidiPhoneLinux+3 - 24
Guvercin
Free plan LinuxMacWeb+1 - 25
Shortwave
Free plan AndroidiPhoneMac+2 - 26
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Meron
Free plan AndroidiPhoneLinux+2 - 28
TypeApp
Free plan AndroidiPhoneLinux+1 - 29
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Apple Mail
Free plan iPhoneMac - 31
PigeonPost
Free plan LinuxMacWindows
That combination may be broader than needed if your priority is shared calendars, scheduling, or coordinating work with others. The alternatives here focus more narrowly on calendars or combine them with communication and collaboration tools. Compare what you need alongside email: shared calendars, scheduling links, time blocking, or video meetings may matter more than Thunderbird’s account management and offline access. Device support also differs: Thunderbird spans desktop systems and Android, while some options center on mobile or web. Most alternatives have a free plan; Outlook, Tuta Calendar, EGroupware, and Teamup also provide paid pricing details, so weigh those costs against the tools you will actually use.