calendar.solutions / a comparison

Calendars are the next thing to federate.

A field guide to digital calendar solutions — the incumbents that quietly own your time, the FOSS alternatives that let you take it back, and the new wave of decentralized protocols treating calendars like the fediverse treats microblogs.

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Open the matrix → Browse all solutions
cal.pub calendar.network daniel.cal.pub alex.cal.pub ccc.cal.pub nextcloud.org thunderbird etesync
FIG. 01
A federated calendar graph. The hero (cal.pub) routes via WebFinger; calendar.network indexes the public surface.
01 — CATEGORIES

Browse by type

From decentralized newcomers to battle-tested FOSS self-hosts.

New wave
Decentralized newcomers
The protocol & the directory
2 solutions
Dominant
Incumbents
What most people use
4 solutions
Own your data
FOSS & self-host
Run it yourself
6 solutions
Beyond personal
Scheduling & events
Team scheduling, events, CFP
4 solutions
Protocol
CalDAV support
Speaks open protocols
12 axes
03 — MATRIX

12-axis comparison matrix

Compare FOSS, self-host, CalDAV, E2EE, decentralization, and 7 more axes across all solutions.

Solution FOSS Self-host Decentral. E2EE CalDAV Price Account Mobile Share Sync API Portable
BA
Baikal
server
 ● ● ○ ○ ● free self-host ◐ ● ● ● ●
CA
Cal.com (Enterprise / closed-source reference)
scheduling
 ○ ◐ ○ ○ ○ paid required ● ● ● ● ○
CA
Cal.diy
scheduling
 ● ● ○ ○ ○ free self-host ◐ ● ● ● ●
ET
Etar
mobile
 ● ○ ○ ○ ● free none ● ○ ● ○ ●
EV
Evolution
desktop
 ● ○ ○ ○ ● free none ○ ○ ● ○ ●
FE
Feber
web-based
 ◐ ● ○ ○ ○ free self-host ◐ ● ○ ○ ○
FO
Fossify Calendar
mobile
 ● ○ ○ ○ ● free none ● ○ ● ○ ●
GN
GNOME Calendar
desktop
 ● ○ ○ ○ ● free none ○ ○ ● ○ ●
HO
Horde Groupware
web-based
 ● ● ○ ○ ● free self-host ● ● ● ● ●
KO
KOrganizer
desktop
 ● ○ ○ ○ ● free none ○ ○ ● ○ ●
NE
NextCloud Calendar
web-based
 ● ● ◐ ○ ● free self-host ● ● ● ● ●
OP
Open Web Calendar
web-based
 ● ● ○ ○ ○ free none ◐ ● ◐ ○ ●
RA
Radicale
server
 ● ● ○ ○ ● free self-host ◐ ● ● ● ●
SI
Simple Calendar
mobile
 ● ○ ○ ○ ● free none ● ○ ● ○ ●
TH
Thunderbird Calendar
desktop
 ● ○ ○ ○ ● free none ○ ○ ● ○ ●
TO
Todo Agenda
mobile
 ● ○ ○ ○ ● free none ● ○ ● ○ ●
Z-
Z-Push
synchronization
 ● ● ○ ○ ○ free self-host ● ○ ● ● ◐
● yes ◐ partial ○ no — n/a