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Proton Calendar alternatives · Calendar

Self-hosted alternatives to Proton Calendar

The Proton Calendar listing does not say it can be self-hosted. 4 of the 75 other calendar and scheduling apps in this directory can be self-hosted, according to their own sites.

Proton Calendar has a free plan. Paid plans start at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. All of them are free or have a free plan.

4 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

How each one differs from Proton Calendar

  1. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.
    • Only Proton Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Timeful is self-hostable, according to its own site.
    • Proton Calendar is end-to-end encrypted, according to its own site.
    Timeful pricing and details

  2. Cal.com

    Scheduling platform with a free plan, API and embeds

    • Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly). Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.
    • Only Cal.com lists a browser extension.
    • Cal.com is self-hostable, according to its own site.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    Cal.com pricing and details

  3. Rallly

    Open-source meeting polls for finding a time that suits a group

    • Rallly starts at $6 per seat / month, billed yearly ($10 billed monthly). Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.
    • Only Proton Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Rallly is self-hostable, according to its own site.
    • Proton Calendar is end-to-end encrypted, according to its own site.
    Rallly pricing and details

  4. Crab Fit

    Free, open-source availability heat map for group events

    • Crab Fit is free. Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.
    • Only Crab Fit lists a browser extension.
    • Only Proton Calendar lists macOS, Windows, Linux and iOS apps.
    • Crab Fit is self-hostable, according to its own site.
    Crab Fit pricing and details

Common questions

Is there a self-hosted alternative to Proton Calendar?

Yes. Timeful, Cal.com, Rallly and Crab Fit can be self-hosted, according to their own sites.

Can Proton Calendar be self-hosted?

The Proton Calendar listing does not say it can be self-hosted. The listing was checked on Oct 5, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Oct 9, 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 Proton Calendar: the alternatives its listing names first, then the tools that share the most features with it.