Free Thunderbird alternatives

All Thunderbird alternatives

1. 

   

   Microsoft Outlook

   4.8(9.3M) · App StoreLike

   Microsoft Outlook is an email and calendar app available on Windows, Mac, mobile and the web, used with Outlook.com, Exchange and Microsoft 365 accounts as well as Gmail and other IMAP services. It combines mail with calendars, contacts and tasks, supports shared mailboxes and scheduled sending, and integrates with Teams for meetings. Copilot can draft replies and summarize threads on eligible plans.

   12 Microsoft Outlook alternatives

   Pros

   • Email, calendar, contacts and tasks in one app
   • Shared mailboxes and Teams integration for businesses
   • Available on Windows, Mac, mobile and the web

   Cons

   • The move from classic to new Outlook on Windows has been disruptive
   • Free Outlook.com accounts show ads
   • Copilot features require an eligible paid plan

   Cost / License

   FreemiumProprietary

   Categories

   Email Clients & ProvidersScheduling & Calendars

   Platforms

   WebWindowsMaciPhoneAndroid

   Features

   AI assistantCalendar viewIntegrationsOffline modeSend laterShared inbox

   Visit websiteMore about Microsoft Outlook
2. M

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   Mailspring

   17.9KstarsLike

   Mailspring is a free, open-source desktop email client for Windows, macOS and Linux that works with Gmail, Office 365, iCloud and any IMAP account. It offers a unified inbox, fast search, themes and templates, and runs its mail sync engine locally rather than in the cloud. An optional Pro subscription adds read receipts, link tracking, send later and reminders.

   7 Mailspring alternatives

   Pros

   • Free and open source on Windows, Mac and Linux
   • Sync engine runs locally rather than through a cloud service
   • Unified inbox, themes and templates in a clean interface

   Cons

   • Send later, reminders and read receipts require Pro
   • A Mailspring ID account is required even for the free version
   • No mobile apps to go with the desktop client

   Cost / License

   FreemiumOpen source

   Categories

   Email Clients & Providers

   Platforms

   WindowsMacLinux

   Features

   Dark modeEmail trackingSend laterTemplatesUnified inbox

   Visit websiteMore about Mailspring
3. 

   

   eM Client

   Like

   eM Client is a desktop email client for Windows and macOS that brings email, calendar, tasks, contacts and notes together in one app. It works with Gmail, Exchange, Microsoft 365, iCloud and IMAP accounts, and includes built-in PGP encryption, snoozing, send later and quick templates. A free version is available for personal use with a limited number of accounts, and the Pro license unlocks the rest.

   7 eM Client alternatives

   Pros

   • Email, calendar, tasks, contacts and notes in one desktop app
   • Built-in PGP encryption without extra plugins
   • Works with Gmail, Exchange, Microsoft 365, iCloud and IMAP

   Cons

   • Free version is for personal use with a limited number of accounts
   • No Linux version, only Windows and Mac
   • Interface can feel dense because of its many features

   Cost / License

   FreemiumProprietary

   Categories

   Email Clients & Providers

   Platforms

   WindowsMac

   Features

   Calendar viewEnd-to-end encryptionSend laterTemplatesUnified inbox

   Visit websiteMore about eM Client
4. 

   

   Apple Mail

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   Apple Mail is the email app included with macOS, iOS and iPadOS, supporting iCloud, Gmail, Exchange and other IMAP accounts in a unified inbox. It offers send later, follow-up reminders, smart search and Mail Privacy Protection, which hides your IP address and stops senders from seeing when you open messages. With iCloud+, Hide My Email creates random addresses that forward to your inbox.

   9 Apple Mail alternatives

   Pros

   • Free and preinstalled on Mac, iPhone and iPad
   • Mail Privacy Protection hides your IP and blocks open tracking
   • Unified inbox for iCloud, Gmail, Exchange and IMAP accounts

   Cons

   • Only available on Apple devices
   • Few power-user features or extensions compared with dedicated clients
   • Hide My Email requires an iCloud+ subscription

   Cost / License

   FreeProprietary

   Categories

   Email Clients & Providers

   Platforms

   MaciPhone

   Features

   Ad-freeEmail aliasesSend laterTracker blockingUnified inbox

   Visit websiteMore about Apple Mail
5. 

   

   Spark

   4.6(82.7K) · App StoreLike

   Spark is an email client from Readdle that works with Gmail, Outlook, iCloud and other IMAP accounts on Mac, Windows, iPhone and Android. Its smart inbox separates personal mail, notifications and newsletters, and it supports send later, snoozing, a gatekeeper for new senders and AI writing help. Teams can share email threads, comment on them privately and draft replies together.

   11 Spark alternatives

   Pros

   • Smart inbox separates personal mail, notifications and newsletters
   • Shared threads and private comments for team email
   • Gatekeeper screens new senders before they reach the inbox

   Cons

   • Sync relies on Readdle’s servers, which raises privacy questions
   • AI and team features require a paid plan

   Cost / License

   FreemiumProprietary

   Categories

   Email Clients & Providers

   Platforms

   WindowsMaciPhoneAndroid

   Features

   AI assistantSend laterTeam collaborationUnified inbox

   Visit websiteMore about Spark
6. 

   

   Gmail

   4.7(2.4M) · App StoreLike

   Gmail is Google's email service, used through the web and mobile apps or any IMAP client. It offers automatic spam filtering, labels and inbox categories, fast search, scheduled sending and close links with Calendar, Drive and Meet. Personal accounts are free and share storage with Drive and Photos, while Google Workspace adds custom domains and admin tools; Gemini can draft and summarize emails.

   12 Gmail alternatives

   Pros

   • Excellent spam filtering and fast search
   • Tight links with Google Calendar, Drive and Meet
   • Free personal accounts on web, mobile and any IMAP client

   Cons

   • Free storage is shared with Drive and Photos and fills up quickly
   • Google’s data practices raise privacy concerns
   • Custom domains require a paid Google Workspace plan

   Cost / License

   FreemiumProprietary

   Categories

   Email Clients & Providers

   Platforms

   WebiPhoneAndroid

   Features

   AI assistantCustom email domainOffline modeSend laterTwo-factor authentication

   Visit websiteMore about Gmail
7. 

   

   Proton Mail

   4.8(48.7K) · App StoreLike

   Proton Mail is an end-to-end encrypted email service based in Switzerland. Messages between Proton users are encrypted automatically, emails to others can be password-protected, and stored mail uses zero-access encryption so Proton cannot read it. Its apps are open source, paid plans add custom domains and more addresses, and it is part of a suite with Proton Calendar, Drive, VPN and Pass.

   9 Proton Mail alternatives

   Pros

   • End-to-end and zero-access encryption protect stored mail
   • Based in Switzerland, with open source apps
   • Part of a suite with Proton Calendar, Drive, VPN and Pass

   Cons

   • Free plan is tight on storage and addresses
   • Using IMAP clients requires Proton Mail Bridge and a paid plan

   Cost / License

   FreemiumOpen source

   Categories

   Email Clients & Providers

   Platforms

   WebWindowsMacLinuxiPhoneAndroid

   Features

   Custom email domainEmail aliasesEnd-to-end encryptionSend laterTracker blockingTwo-factor authentication

   Visit websiteMore about Proton Mail
8. 

   

   Tuta

   4.7(3.7K) · App StoreLike

   Tuta, formerly Tutanota, is an open-source encrypted email and calendar service based in Germany. It encrypts mailbox contents end to end, including subject lines and contacts, and uses post-quantum cryptography for new accounts. Because it relies on its own encryption, it works through Tuta's apps rather than IMAP clients. A free plan exists, and paid plans add custom domains and more aliases.

   7 Tuta alternatives

   Pros

   • Encrypts subjects and contacts, not just message bodies
   • Post-quantum cryptography for new accounts
   • Open source apps and a free plan, with servers in Germany

   Cons

   • No IMAP support, so you must use Tuta’s own apps
   • Free plan is limited in storage and features
   • Fewer integrations and features than mainstream providers

   Cost / License

   FreemiumOpen source

   Categories

   Email Clients & Providers

   Platforms

   WebWindowsMacLinuxiPhoneAndroid

   Features

   Calendar viewCustom email domainEmail aliasesEnd-to-end encryptionGDPR compliant

   Visit websiteMore about Tuta