K-9 Mail Alternatives for iPhone

K-9 Mail is not available for iPhone but there are plenty of alternatives with similar functionality. The best iPhone alternative is Microsoft Outlook. It's not free, so if you're looking for a free alternative, you could try Spark Mail or Apple Mail. If that doesn't suit you, our users have ranked more than 25 alternatives to K-9 Mail and 15 are available for iPhone so hopefully you can find a suitable replacement. Other interesting iPhone alternatives to K-9 Mail are Canary Mail, Infomaniak kMail, BlueMail and Shortwave.

filter to find the best alternatives

K-9 Mail alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Cloud Storage Services 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.
K-9 Mail iconK-9 Mail
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  • ...

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,...

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K-9 Mail alternatives page was last updated Mar 13, 2025
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  1. Microsoft Outlook icon

    Microsoft Outlook

     397 likes
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    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.

    125 Microsoft Outlook alternatives

    License model

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
    Microsoft Outlook screenshot 1

    Top Microsoft Outlook Features

    1.  Exchange
    2.  Native application
    3.  Email Organizer
    4.  Calendar Integration
    5.  Calendar View
    6.  Cloud Sync
    7.  Support for @mentions
    8.  Unified inbox
    9.  Multiple Account support
    10.  Works Offline
    11.  Support for Aliases
    12.  Dark Mode

    Microsoft Outlook VS K-9 Mail

     
    Comments about Microsoft Outlook as an Alternative to K-9 Mail
    Guest
    Negative May 14, 2019
    5

    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!

    Guest
    Negative Oct 5, 2024
    0

    If you use outlook for another email it will strore the password on a Microsoft server

    K-9 Mail Icon
    Microsoft Outlook icon

    • This alternative is disputed. Microsoft Outlook is a legitimate K-9 Mail alternative, but it might have issues that some users think are important.

    • Microsoft Outlook is the most popular Web-based, iPhone & iPad alternative to K-9 Mail.

    • Microsoft Outlook is the most popular commercial alternative to K-9 Mail.

    • Microsoft Outlook is Paid and ProprietaryK-9 Mail is Free and Open Source
  2. Spark Mail icon

    Spark Mail

     131 likes
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    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.

    61 Spark Mail alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • UA flagUkraine

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1

    Top Spark Mail Features

    1.  Multiple Account support
    2.  Email Scheduling
    3.  Snooze Mail
    4.  Cloud Sync
    5.  Calendar Integration
    6.  Dark Mode
    7.  Email Organizer
    8.  Unified inbox
    9.  Works Offline
    10.  Mail Filtering
    11.  Ad-free
    12. Google Calendar icon  Sync with Google Calendar

    Spark Mail VS K-9 Mail

     
    Comments about Spark Mail as an Alternative to K-9 Mail
    abogawat
    Positive Oct 31, 2023
    0

    Spark 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.

    K-9 Mail Icon
    Spark Mail icon

    • Almost everyone thinks Spark Mail is a great K-9 Mail alternative.

    • Spark Mail is Freemium and ProprietaryK-9 Mail is Free and Open Source
  4. Apple Mail icon

    Apple Mail

     237 likes
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    There’s big news attached. The best way to manage email on a Mac, according to Apple.

    72 Apple Mail alternatives

    License model

    • Free • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • iPhone
    • iPad
    • Online
    • Apple Watch
    Apple Mail screenshot 1

    Properties

    1.  Customizable

    Features

    1.  Bundled with macOS
    2.  Email Organizer
    3.  Multiple Account support
    4.  Dark Mode
    5.  Spam Filter
    6.  CardDAV Support
    7.  Exchange
    8.  CalDAV Support
    9.  Rich text editing
    10.  Encrypted Email

    Apple Mail VS K-9 Mail

     
  5. Ad
    Screenshot
    Infomaniak kMail icon
    Infomaniak kMail

    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 E...

    https://www.infomaniak.com
    Learn More
  6. Canary Mail icon

    Canary Mail

     26 likes
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    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

    • GB flagUnited Kingdom

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    iOS-1

    Properties

    1.  Privacy focused
    2.  Lightweight

    Features

    1.  End-to-End Encryption
    2.  Unified inbox
    3.  PGP Encryption
    4.  Multiple Account support
    5.  AI-Powered
    6.  GPG Encryption
    7.  Dark Mode
    8.  No Tracking
    9.  Cloud Sync
    10.  Ad-free
    11.  Reminders
    12.  Encrypted Email

    Canary Mail VS K-9 Mail

     
  7. Infomaniak kMail icon

    Infomaniak kMail

     32 likes
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    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.

    41 Infomaniak kMail alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • CH flagSwitzerland

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Ad-free
    2.  No Tracking
    3.  Portable
    4.  Calendar Integration
    5.  Multiple Account support
    6.  Cloud Sync
    7.  Support for Aliases
    8.  Real time collaboration
    9.  Secure mail
    10.  Sync Contacts
    11.  Calendar Sync
    12.  CardDAV Support

    Infomaniak kMail VS K-9 Mail

     
    Comments about Infomaniak kMail as an Alternative to K-9 Mail
    Guest
    Negative Jul 21, 2024
    0

    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

    K-9 Mail Icon
    Infomaniak kMail icon
    • Infomaniak kMail is Freemium and Open SourceK-9 Mail is Free and Open Source
    • Infomaniak kMail is Privacy focusedK-9 Mail is not according to our users
  8. BlueMail icon

    BlueMail

     33 likes
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    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.

    31 BlueMail alternatives

    License model

    • Free Personal • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch
    BlueMail screenshot 1
    BlueMail screenshot 2
    BlueMail screenshot 3

    Properties

    1.  Lightweight

    Features

    1.  Unified inbox
    2.  IMAP Support
    3.  Ad-free
    4.  GDPR Compliant
    5.  Multiple Account support
    6.  Calendar Integration
    7.  POP3 Support

    BlueMail VS K-9 Mail

     
  10. Shortwave icon

    Shortwave

     15 likes
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    Shortwave is an email app that takes the pain out of managing your inbox, making it effortless to stay organized, productive, and responsive.

    License model

    • Freemium • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Gmail
    Shortwave screenshot 1
    Shortwave screenshot 2
    Shortwave screenshot 3

    Properties

    1.  Lightweight

    Features

    1.  Dark Mode
    2.  Email Organizer
    3.  AI-Powered
    4.  Email Scheduling
    5.  Ad-free
    6.  Push Notifications
    7.  Multiple Account support
    8.  Calendar Integration
    9.  Support for Aliases
    10.  No Tracking
    11.  Spam Filter
    12.  Mail Filtering

    Shortwave VS K-9 Mail

     
  11. Airmail icon

    Airmail

     73 likes
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    Engineered for iOS, macOS, and watchOS, this fast mail client supports multiple account types, custom actions, Smart Inbox filtering, unified inbox, privacy mode, email scheduling, snooze, third-party app integration, flexible personalization, and advanced workflow tools.

    66 Airmail alternatives

    License model

    Application type

    Country of Origin

    • IT flagItaly
    • European Union flagEU

    Platforms

    • Mac
    • iPhone
    • iPad
    • Apple Watch
    Airmail screenshot 1

    Properties

    1.  Lightweight
    2.  Clean design
    3.  Customizable

    Features

    1.  Multiple Account support
    2.  IMAP Support
    3.  POP3 Support
    4.  Fullscreen support
    5. Dropbox icon  Dropbox integration

    Airmail VS K-9 Mail

     
  12. TypeApp icon

    TypeApp

     30 likes
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    TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.

    57 TypeApp alternatives

    License model

    • Free Personal • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Android Wear
    • Kindle Fire
    TypeApp screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Unified inbox
    2.  Email Organizer
    3.  Multiple Account support
    4.  Live Push Notifications
    5.  Exchange

    TypeApp VS K-9 Mail

     
  13. Email - Edison Mail icon

    Email - Edison Mail

     7 likes
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    Email by Edison (formerly Email by EasilyDo) is a brand new, elegantly designed, universal mail app to manage unlimited mail accounts.

    18 Email - Edison Mail alternatives

    License model

    • Free • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Android
    • iPhone
    Email - Edison Mail screenshot 1
    Email - Edison Mail screenshot 2
    Email - Edison Mail screenshot 3

    Email - Edison Mail Features

    1.  Multiple Account support
    2.  Ad-free
    3.  Email Organizer
    4.  Mobile friendly
    5.  Exchange

    Email - Edison Mail VS K-9 Mail

     
  14. myMail icon

    myMail

     17 likes
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    myMail is the smart email app for managing all your accounts on iOS and Android.

    28 myMail alternatives

    License model

    • Free • Proprietary

    Application type

    Country of Origin

    • NL flagNetherlands
    • European Union flagEU

    Platforms

    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    myMail screenshot 1
    myMail screenshot 2
    myMail screenshot 3

    myMail Features

    1.  Multiple Account support
    2.  Mail Filtering
    3.  Unified inbox
    4.  Push Notifications
    5.  POP3 Support
    6.  IMAP Support
    7.  Mobile friendly
    8.  Filter Management

    myMail VS K-9 Mail

     
  15. Superhuman icon

    Superhuman

     3 likes
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    The fastest email experience ever made.

    52 Superhuman alternatives

    License model

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Online
    • iPhone
    • iPad
    Superhuman screenshot 1
    Superhuman screenshot 2
    Superhuman screenshot 3

    Superhuman Features

    1.  Inbox Management

    Superhuman VS K-9 Mail

     
12 of 15 K-9 Mail alternatives