The Best K-9 Mail AlternativesTop Email Clients and other similar apps like K-9 Mail
K-9 Mail is described as 'K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more' and is a very popular Email Client in the office & productivity category. There are more than 25 alternatives to K-9 Mail for a variety of platforms, including Android, Windows, Mac, iPhone and Android Tablet apps. The best K-9 Mail alternative is Thunderbird, which is both free and Open Source. Other great apps like K-9 Mail are FairEmail, Betterbird, Evolution and Microsoft Outlook.
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K-9 Mail alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Contact Managers you can filter on that. Other popular filters include Android + Open Source. These are just examples - use the filter bar below to find more specific alternatives to K-9 Mail.- Email Client
- Free • Open Source
- 84 Thunderbird alternatives
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
License model
- Free • Open Source
Application types
Country of Origin
United States
Platforms
- Mac
- Windows
- Linux
- Android
- BSD
- AppImageHub
- Snapcraft
- Flathub
- PortableApps.com
- F-Droid
- Haiku
- Homebrew
- Chocolatey
Comments about Thunderbird as an Alternative to K-9 Mail
- 43 FairEmail alternatives
Open-source, privacy-focused email client offering features such as encryption via OpenPGP and S/MIME, unlimited accounts, a unified inbox, customizable settings, and reformatted emails to prevent phishing. Supports two-way synchronization and provides Pro features for additional customization.
License model
- Freemium • Open Source
Application type
Country of Origin
Netherlands
EU
Platforms
- Android
- Android Tablet
- F-Droid
Comments about FairEmail as an Alternative to K-9 Mail
LongLifeBoth are opensource, privacy oriented, free email clients for Android
- 27 Betterbird alternatives
Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.
License model
- Free • Open Source
Application types
Country of Origin
Germany
EU
Platforms
- Mac
- Windows
- Linux
- Flathub
- Chocolatey
- 72 Evolution alternatives
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
License model
- Free • Open Source
Application types
Country of Origin
United States
Platforms
- Linux
- BSD
- Flathub
- S/MIME
- GNOME
- OpenPGP
Top Evolution Features
- 128 Microsoft Outlook alternatives
Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.
License model
- Paid • Proprietary
Application types
Country of Origin
United States
Platforms
- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Apple Watch
- Android Wear
Top Microsoft Outlook Features
Comments about Microsoft Outlook as an Alternative to K-9 Mail
Microsoft Office Outlook has more vulnerabilities and so far, seems more of a memory hogger on my device than K-9 Mail. Thank you, K-9 Mail!
If you use outlook for another email it will strore the password on a Microsoft server
- 61 Spark Mail alternatives
E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.
License model
- Freemium • Proprietary
Application types
Country of Origin
Ukraine
Platforms
- Mac
- Windows
- Android
- iPhone
- iPad
- Apple Watch
Top Spark Mail Features
Comments about Spark Mail as an Alternative to K-9 Mail
abogawatSpark is one of the most polished email clients out there, with multi-platform support and an excellent feature set. The free version is good enough for most people.
- 42 Mailspring alternatives
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
License model
- Freemium • Open Source
Application types
Country of Origin
United States
Platforms
- Mac
- Windows
- Linux
- Arch Linux
- Fedora
- Ubuntu
- 62 Claws Mail alternatives
Claws Mail is an email client (and news reader), based on GTK+, featuring
Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.
- 72 Apple Mail alternatives
There’s big news attached. The best way to manage email on a Mac, according to Apple.
License model
- Free • Proprietary
Application type
Country of Origin
United States
Platforms
- Mac
- iPhone
- iPad
- Online
- Apple Watch
- 61 Canary Mail alternatives
Canary can write your emails, prioritize what needs attention, silence spam & much more. Say hello to your Inbox Copilot!
License model
- Freemium • Proprietary
Application types
Country of Origin
United Kingdom
Platforms
- Mac
- Windows
- Android
- iPhone
- Android Tablet
- iPad
- Apple Watch
- 41 Infomaniak kMail alternatives
Infomaniak’s Mail Service is a secure emailing system hosted in Switzerland and is the best (free) alternative to the web giants. Infomaniak’s emailing service is used by more than a million companies and individuals throughout Europe.
License model
- Freemium • Open Source
Application types
Country of Origin
Switzerland
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- F-Droid
Comments about Infomaniak kMail as an Alternative to K-9 Mail
The Infomaniak client only works with Infomaniak mail accounts, while K-9 Mail supports all mail accounts that use the standard IMAP and SMTP protocols
- 30 BlueMail alternatives
BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.
License model
- Free Personal • Proprietary
Application type
Country of Origin
United States
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Chrome OS
- Android Tablet
- iPad
- Apple Watch
A really great client used by many, popular because it supports almost every mail provider (not proton ?), and mail providers provide documentation to integrate with Thunderbird. I recommand