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Roundcube alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Roundcube: needs your own server and IMAP backend, and less polished than commercial webmail. We ranked 5 alternatives by how directly each one replaces Roundcube, then by reviews, real visits and how recently each app's facts were checked against its own website. Thunderbird currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Thunderbird logoThunderbirdOpen sourceYesWindows, macOS, Linux +15 of 566.5
2Zoho Mail logoZoho MailFree plan + paidNoWeb, Windows, macOS +34 of 457.2
  1. Thunderbird logo

    1. ThunderbirdTop pick

    Best for: Desktop users who want a free, private, customisable mail and calendar app

    Open sourceWindows, macOS, Linux, Android

    66.5

    score / 100

    Why switch from Roundcube

    A free desktop client for the same IMAP server, if browser access isn't required.

    Pros

    • Free, open source and funded by donations, with no ads
    • Built-in OpenPGP, calendar, filters and many add-ons
    • Runs on Windows, Mac, Linux and Android

    Cons

    • No web version and no released iOS app yet
    • Add-ons sometimes break after major updates
    • Exchange setups can need extra configuration
    Visit Thunderbird Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Thunderbird a good Roundcube alternative?

    Verified facts

    5 of 5 verified
    Desktop platforms
    Windows, Linux, macOS
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Price
    Free, funded by donations
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Mobile app
    Open-source Android app
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Android app origin
    Formerly K-9 Mail
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Android app license
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
  2. Zoho Mail logo

    2. Zoho Mail

    Best for: Small businesses that want cheap, ad-free email on their own domain

    Free plan + paidWeb, Windows, macOS, Linux, iOS, Android

    57.2

    score / 100

    Why switch from Roundcube

    Hosted business webmail with a free plan for small teams.

    Pros

    • Free plan for a few users on a custom domain
    • Much cheaper than Google Workspace or Microsoft 365
    • Ties into Zoho CRM and the rest of the Zoho suite

    Cons

    • Free plan lacks IMAP and has limited storage
    • Interface feels crowded
    • Fewer third-party integrations than Google or Microsoft
    Visit Zoho Mail Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Zoho Mail a good Roundcube alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Up to 5 users
    Checked Oct 25, 2026zoho.com(opens source in a new tab)
    Free plan storage
    5 GB per user, one domain
    Checked Oct 25, 2026zoho.com(opens source in a new tab)
    Encryption
    TLS, S/MIME, AES-256 at rest
    Checked Oct 25, 2026zoho.com(opens source in a new tab)
    Business customers
    550,000+
    Checked Oct 25, 2026zoho.com(opens source in a new tab)

The best Roundcube alternative for…

The highest-ranked app in this list for each need.

Thunderbird logo

Best Roundcube alternative for most people

Thunderbird

A free desktop client for the same IMAP server, if browser access isn't required.

Geary logo

Best Roundcube alternative for a free option

Geary

A lightweight open-source desktop client for Linux users on the same server.

Zoho Mail logo

Best Roundcube alternative for a free plan you can upgrade

Zoho Mail

Hosted business webmail with a free plan for small teams.

Thunderbird logo

Best Roundcube alternative for open source

Thunderbird

A free desktop client for the same IMAP server, if browser access isn't required.

Thunderbird logo

Best Roundcube alternative for Mac

Thunderbird

A free desktop client for the same IMAP server, if browser access isn't required.

Thunderbird logo

Best Roundcube alternative for Windows

Thunderbird

A free desktop client for the same IMAP server, if browser access isn't required.

Thunderbird logo

Best Roundcube alternative for Linux

Thunderbird

A free desktop client for the same IMAP server, if browser access isn't required.

Fastmail logo

Best Roundcube alternative for iPhone and Android

Fastmail

Hosted email with a fast web app, so there's no server to maintain.

mailbox.org logo

Best Roundcube alternative for working in the browser

mailbox.org

Hosted European email with webmail, if you'd rather not self-host.

Roundcube alternatives: common questions

What is the best alternative to Roundcube?

Thunderbird ranks first right now. A free desktop client for the same IMAP server, if browser access isn't required. Fastmail and mailbox.org follow it in our ranking.

Is there a free alternative to Roundcube?

Yes. Thunderbird (open source), Zoho Mail (free plan + paid) and Geary (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Roundcube?

Yes: Thunderbird and Geary.

Which Roundcube alternatives work on Linux?

Thunderbird, Zoho Mail and Geary run on Linux.

Why do people switch from Roundcube?

The complaints we hear most: needs your own server and IMAP backend; less polished than commercial webmail; frequent security updates to keep up with.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Roundcube, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.