Skip to content
ToolGPA

OnceHub alternatives · Calendar

OnceHub alternatives with a Linux app

The OnceHub listing does not include a Linux app. 9 of the 89 other calendar and scheduling apps in this directory list a Linux app.

OnceHub has a free plan. Paid plans start at $10 per seat / month, billed annually ($12 billed monthly). 8 of them are free or have a free plan.

9 tools · Listings checked up to Nov 12, 2026 · Where the facts come from

How each one differs from OnceHub

  1. Cal.com

    Scheduling platform with a free plan, API and embeds

    • Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly). OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Cal.com lists macOS, Windows, Linux, iOS and Android apps.
    • Cal.com is self-hostable, according to its own site.
    • Cal.com also covers workflow automation.
    Cal.com vs OnceHubCal.com pricing and details

  2. Toki

    AI calendar assistant that turns messages into events and to-dos

    • Toki starts at $9.99 per month (Super). OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Toki lists macOS, Windows, Linux, iOS and Android apps.
    • Only OnceHub lists a browser extension.
    • Toki also covers tasks, natural-language input, calendar and AI agents.
    Toki pricing and details

  3. Proton Calendar

    End-to-end encrypted calendar from the maker of Proton Mail

    • Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Proton Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Only OnceHub lists a browser extension.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    Proton Calendar pricing and details

  4. fruux

    CalDAV and CardDAV sync for contacts, calendars and tasks

    • fruux starts at €4 per month or €40 per year (Pro). OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only fruux lists macOS, Windows, Linux, iOS and Android apps.
    • Only OnceHub lists a browser extension.
    • fruux also covers tasks and calendar.
    fruux pricing and details

  5. Tuta Calendar

    End-to-end encrypted calendar bundled with Tuta Mail

    • Tuta Calendar starts at €3 per month, paid yearly (€3.60 paid monthly). OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Tuta Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Only OnceHub lists a browser extension.
    • Tuta Calendar is open source and end-to-end encrypted, according to its own site.
    Tuta Calendar pricing and details

  6. CalenGoo

    Highly configurable calendar and task app sold as a one-time purchase

    • CalenGoo starts at $5.99 one-time for Android; $6.99 for iOS; $49.99 for the desktop app. OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • OnceHub has a free plan. CalenGoo does not, though it has a free trial.
    • Only CalenGoo lists iOS, Android, Windows, macOS and Linux apps.
    • Only OnceHub lists a web app.
    CalenGoo pricing and details

  7. Rainlendar

    Skinnable desktop calendar for Windows, Mac and Linux

    • Rainlendar starts at €9.95 one-time for a lifetime Rainlendar Pro license. OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Rainlendar lists Windows, macOS and Linux apps.
    • Only OnceHub lists a web app.
    • Only OnceHub lists a browser extension.
    Rainlendar pricing and details

  8. GNOME Calendar

    Free, open-source calendar app for the GNOME desktop on Linux

    • GNOME Calendar is free. OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only GNOME Calendar lists a Linux app.
    • Only OnceHub lists a web app.
    • Only OnceHub lists a browser extension.
    GNOME Calendar pricing and details

  9. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. OnceHub starts at $10 per seat / month, billed annually ($12 billed monthly).
    • Only Merkuro Calendar lists a Linux app.
    • Only OnceHub lists a web app.
    • Only OnceHub lists a browser extension.
    Merkuro Calendar pricing and details

Common questions

Which OnceHub alternatives have a Linux app?

Cal.com, Toki, Proton Calendar, fruux, Tuta Calendar, CalenGoo, Rainlendar, GNOME Calendar and 1 more list a Linux app.

Does OnceHub have a Linux app?

The OnceHub listing does not include a Linux app. It lists Web and Browser extension.

Which of these calendar and scheduling apps are free?

Cal.com, Toki, Proton Calendar, fruux, Tuta Calendar, Rainlendar, GNOME Calendar and Merkuro Calendar are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 12, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to OnceHub: the alternatives its listing names first, then the tools that share the most features with it.