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Reservio alternatives · Calendar

Open-source alternatives to Reservio

Reservio is not described as open source on its own site. 13 of the 114 other calendar and scheduling apps in this directory are open source, according to their own sites.

Reservio has a free plan. Paid plans start at $10 per month, prepaid for 6 months ($60), plus VAT. 12 of them are free or have a free plan.

13 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to Reservio

  1. Easy!Appointments

    Open source appointment scheduler you host on your own server

    • Easy!Appointments starts at $20 per month, billed annually ($240 a year), for managed hosting. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Reservio lists iOS and Android apps.
    • Easy!Appointments is open source and self-hostable, according to its own site.
    • Reservio also covers class booking.
    Easy!Appointments pricing and details

  2. 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. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Proton Calendar lists macOS, Windows and Linux apps.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    • Reservio also covers appointment booking and class booking.
    Proton Calendar 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). Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Reservio lists iOS and Android apps.
    • Rallly is open source and self-hostable, according to its own site.
    • Reservio also covers calendar, booking links, appointment booking and class booking.
    Rallly pricing and details

  4. Tuta Calendar

    End-to-end encrypted calendar bundled with Tuta Mail

    • Tuta Calendar starts at €3 per month, paid yearly (€3.60 paid monthly). Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Tuta Calendar lists macOS, Windows and Linux apps.
    • Tuta Calendar is open source and end-to-end encrypted, according to its own site.
    • Reservio also covers booking links, appointment booking and class booking.
    Tuta Calendar pricing and details

  5. Itsycal

    Free, tiny menu bar calendar for the Mac

    • Itsycal is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Itsycal lists a macOS app.
    • Only Reservio lists a web app.
    • Only Reservio lists iOS and Android apps.
    Itsycal pricing and details

  6. MeetingBar

    Free Mac menu bar app that shows and joins your next meeting

    • MeetingBar is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only MeetingBar lists a macOS app.
    • Only Reservio lists a web app.
    • Only Reservio lists iOS and Android apps.
    MeetingBar pricing and details

  7. Fossify Calendar

    Open-source Android calendar with no ads, tracking or account

    • Fossify Calendar is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Reservio lists a web app.
    • Only Reservio lists an iOS app.
    • Fossify Calendar is open source, according to its own site.
    Fossify Calendar pricing and details

  8. Etar

    Open-source Material Design calendar for Android

    • Etar is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Reservio lists a web app.
    • Only Reservio lists an iOS app.
    • Etar is open source, according to its own site.
    Etar pricing and details

  9. GNOME Calendar

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

    • GNOME Calendar is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only GNOME Calendar lists a Linux app.
    • Only Reservio lists a web app.
    • Only Reservio lists iOS and Android apps.
    GNOME Calendar pricing and details

  10. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Merkuro Calendar lists a Linux app.
    • Only Reservio lists a web app.
    • Only Reservio lists iOS and Android apps.
    Merkuro Calendar pricing and details

  11. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Only Reservio lists iOS and Android apps.
    • Timeful is open source and self-hostable, according to its own site.
    • Timeful also covers surveys.
    Timeful pricing and details

  12. Simple Calendar Pro

    Offline Android calendar with CalDAV sync and no ads, bought once

    • Simple Calendar Pro starts at $2.99 one-time. Reservio starts at $10 per month, prepaid for 6 months ($60), plus VAT.
    • Reservio has a free plan. Simple Calendar Pro does not.
    • Only Reservio lists a web app.
    • Only Reservio lists an iOS app.
    Simple Calendar Pro pricing and details

1 more that are open source

All 13 in one table

Common questions

Is there an open-source alternative to Reservio?

Yes. Easy!Appointments, Proton Calendar, Rallly, Tuta Calendar, Itsycal, MeetingBar, Fossify Calendar, Etar and 5 more are open source, according to their own sites.

Is Reservio open source?

Reservio is not described as open source on its own site. The listing was checked on Nov 12, 2026 against the pages it cites.

Which of these calendar and scheduling apps are free?

Easy!Appointments, Proton Calendar, Rallly, Tuta Calendar, Itsycal, MeetingBar, Fossify Calendar, Etar and 4 more are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 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 Reservio: the alternatives its listing names first, then the tools that share the most features with it.