Unibox AlternativesOnly apps categorised as Calendar Apps

The best Calendar alternative to Unibox is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Unibox and three of them are Calendar Apps so hopefully you can find a suitable replacement. Other interesting Calendar App alternatives to Unibox are Spark Mail and Canary Mail.

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Unibox alternatives are mainly Email Clients but may also be Calendar Apps or Contact Managers.  Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Unibox.
Unibox iconUnibox
  18
  • ...

Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list.

More about Unibox
More about Unibox
Unibox alternatives page was last updated Nov 8, 2023
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  1. Thunderbird icon
    Thunderbird icon

    Thunderbird

     2428 likes
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    Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

    84 Thunderbird alternatives
    Thunderbird screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Haiku
    • Homebrew
    • Chocolatey
    Thunderbird screenshot 1
    Thunderbird screenshot 2
    +8
    Thunderbird screenshot 3

    Properties

    1.  Customizable
    2.  Intuitive Interface

    Features

    1.  Extensible by Plugins/Extensions
    2.  Multiple Account support
    3.  IMAP Support
    4.  Calendar Integration
    5.  SMTP Support
    6.  Email Organizer
    7.  Add-ons
    8.  Built-in RSS reader
    9.  POP3 Support
    10.  Graphical User Interface
    11.  Dark Mode
    12. Google Calendar icon  Google Calendar integration
    Thunderbird iconUnibox Icon

    Thunderbird VS Unibox

    Is Thunderbird a good alternative to Unibox?
     

    • Thunderbird is the most popular Windows, Android, Mac & Linux alternative to Unibox.

    • Thunderbird is the most popular Open Source & free alternative to Unibox.

    • Thunderbird is Free and Open SourceUnibox is Paid and Proprietary
    • Thunderbird is CustomizableUnibox is not according to our users
  2. Spark Mail icon
    Spark Mail icon

    Spark Mail

     125 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.

    62 Spark Mail alternatives
    Spark Mail screenshot 1

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1
    Spark Mail screenshot 2
    +3
    Spark Mail screenshot 3

    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 iconUnibox Icon

    Spark Mail VS Unibox

    Is Spark Mail a good alternative to Unibox?
     

    • Spark Mail is the most popular iPhone & iPad alternative to Unibox.

    • Spark Mail is Freemium and ProprietaryUnibox is Paid and Proprietary
  4. Canary Mail icon
    Canary Mail icon

    Canary Mail

     25 likes
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    Canary can write your emails, prioritize what needs attention, silence spam & much more. Say hello to your Inbox Copilot!

    61 Canary Mail alternatives
    iOS-1

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    iOS-2
    iOS-3
    +9
    iOS-4

    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 iconUnibox Icon

    Canary Mail VS Unibox

    Is Canary Mail a good alternative to Unibox?
     

    • Canary Mail is the most popular Android Tablet alternative to Unibox.

    • Canary Mail is Freemium and ProprietaryUnibox is Paid and Proprietary
    • Canary Mail is Privacy focused and LightweightUnibox is not according to our users
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