OnMail AlternativesOnly apps categorised as Calendar Apps

The best Calendar alternative to OnMail is Proton Mail, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to OnMail and five of them are Calendar Apps so hopefully you can find a suitable replacement. Other interesting Calendar App alternatives to OnMail are Microsoft Outlook, Mailbox.org, Fastmail and Vivaldi Mail.

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OnMail alternatives are mainly WebMail Providers but may also be Email Clients or Calendar Apps.  Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of OnMail.
OnMail iconOnMail
  4
  • Freemium • Proprietary
  • ...

It's time to change email. A brand new email service, built from scratch for today's world.

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OnMail alternatives page was last updated May 3, 2021
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  1. Proton Mail icon
    Proton Mail icon

    Proton Mail

     871 likes
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    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any device.

    94 Proton Mail alternatives
    Proton Mail screenshot 1

    License model

    • Freemium • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    Proton Mail screenshot 1
    Proton Mail screenshot 2
    +6
    Proton Mail screenshot 3

    Properties

    1.  Privacy focused
    2.  Security & Privacy

    Features

    1.  End-to-End Encryption
    2.  Encrypted Email
    3.  Ad-free
    4.  Two-factor Authentication
    5.  Mobile friendly
    6.  No Tracking
    7.  Custom Domain
    8.  Dark Mode
    9.  PGP Encryption
    10.  Anonymous Email
    11.  Filters
    12.  Self Destructing Messages
    13.  IMAP Support
    14.  Integrated Spam Protection
    15.  Custom Link Alias
    16.  Calendar Integration
    17.  Support for Aliases
    18.  Email Organizer
    Proton Mail iconOnMail Icon

    Proton Mail VS OnMail

    Is Proton Mail a good alternative to OnMail?
     

    • Proton Mail is the most popular Web-based, Windows, Android & Mac alternative to OnMail.

    • Proton Mail is the most popular Open Source & free alternative to OnMail.

    • Proton Mail is Freemium and Open SourceOnMail is Freemium and Proprietary
    • Proton Mail is Privacy focusedOnMail is not according to our users
  2. Microsoft Outlook icon
    Microsoft Outlook icon

    Microsoft Outlook

     394 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.

    136 Microsoft Outlook alternatives
    Outlook 365 on Windows

    License model

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
    Outlook for Mac 2016
    Microsoft Outlook screenshot 2
    +7
    Microsoft Outlook screenshot 3

    Top Microsoft Outlook Features

    1.  Exchange
    2.  Native application
    3.  Email Organizer
    4.  Contacts
    5.  Built-in Calendar
    6.  Calendar Integration
    7.  Onenote Desktop Integration
    8.  Address book integration
    9.  Calendar View
    10.  Support for Aliases
    11.  Multiple Account support
    12.  Works Offline
    13.  Cloud Sync
    14.  Unified inbox
    15.  Dark Mode
    16.  Support for @mentions
    17.  Onedrive integration
    18.  Custom rules
    19.  Smart attachments
    20.  Exchange Integration
    21.  ICloud Integration
    22.  Box.com integration
    Microsoft Outlook iconOnMail Icon

    Microsoft Outlook VS OnMail

    Is Microsoft Outlook a good alternative to OnMail?
     

    • Microsoft Outlook is the most popular commercial alternative to OnMail.

    • Microsoft Outlook is Paid and ProprietaryOnMail is Freemium and Proprietary
  4. Mailbox.org icon
    Mailbox.org icon

    Mailbox.org

     59 likes
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    E-mail inbox, online office, cloud storage, and video conferencing. Business or personal plans. From 1 € /month (1.10 USD).

    75 Mailbox.org alternatives
    Dashboard online office. Powered by Open-Xchange

    License model

    Application types

    Platforms

    • Online
    Unlimited video conference. Up to 10 participants. OpenTalk.
    Webmail
    +5
    Online office shortcut menu. Powered by Open-Xchange.

    Properties

    1.  Privacy focused

    Features

    1.  Custom Domain
    2.  Encrypted Email
    3.  IMAP Support
    4.  Built-in Calendar
    5.  File Storage
    6.  Contacts
    7.  PGP Encryption
    8.  No Tracking
    9.  Calendar Integration
    10.  Spam Filter
    11.  Two-factor Authentication
    12.  Automatic Backup
    13.  Real time collaboration
    14.  Support for Aliases
    15.  Cloud Sync
    16.  Self Destructing Messages
    17.  CalDAV Support
    18.  CardDAV Support
    19.  Support for SFTP
    20.  Supports XMPP
    Mailbox.org iconOnMail Icon

    Mailbox.org VS OnMail

    Is Mailbox.org a good alternative to OnMail?
     
  5. Ad
    Screenshot
    Proton Mail icon

    Proton Mail

    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any devi...

    https://proton.me
    Learn More
  6. Fastmail icon
    Fastmail icon

    Fastmail

     68 likes
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    Fastmail provides one of the most secure and reliable email environments in the industry. Rock Solid Reliability. More safety.

    66 Fastmail alternatives
    Official Website

    License model

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Inbox
    Alias
    +6
    Calendar

    Properties

    1.  Privacy focused

    Features

    1.  Support for Aliases
    2.  Ad-free
    3.  Integrated Spam Protection
    4.  File Storage
    5.  Two-factor Authentication
    6.  Full-Text Search
    7.  Email Organizer
    8.  Reminders
    9.  No Tracking
    10.  Spam Filter
    11.  Calendar Integration
    12.  Calendar View
    13.  Mail Filtering
    14.  Privacy
    15.  CalDAV Support
    16.  SMTP Support
    17.  JMAP
    18.  GDPR Compliant
    19.  Sieve filtering
    20.  Built-in Calendar
    21.  IMAP Support
    Fastmail iconOnMail Icon

    Fastmail VS OnMail

    Is Fastmail a good alternative to OnMail?
     
  7. Vivaldi Mail icon
    Vivaldi Mail icon

    Vivaldi Mail

     32 likes
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    Vivaldi Mail is a free email service with no ads and no strings attached developed by Vivaldi Technologies. It also offers contacts and calendar features, search capabilities, folders management, WEB/POP/IMAP access, 10GB of storage capacity, 20 MB of maximum attachment size...

    92 Vivaldi Mail alternatives
    Mail

    License model

    • Free • Proprietary

    Application types

    Platforms

    • Online
    • Vivaldi
    Calendar
    New Message
    +2
    Manage Folders

    Vivaldi Mail Features

    1.  Ad-free
    2.  PGP Encryption
    3.  Mail Filtering
    4.  Dark Mode
    5.  Calendar Integration
    6.  IMAP Support
    7.  POP3 Support
    8.  Encrypted Email
    9.  Web-Based
    Vivaldi Mail iconOnMail Icon

    Vivaldi Mail VS OnMail

    Is Vivaldi Mail a good alternative to OnMail?
     
5 of 5 OnMail alternatives