Top 12 Open-Source Alternatives to Lightning Calendar

Lightning Calendar

Organize your life — it’s about time!

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🚨 Lightning Calendar has been discontinued
🔎 You can review its best alternatives below or view status details

Product categories

APIs Appointment Scheduling Appointments and Scheduling Audio Recording Calendar Calendar And Scheduling Email Email Clients Enterprise Communication Productivity SMTP Server Self-hosted Email

Summary

The top open-source alternatives to Lightning Calendar are Simple Calendar, Calendar Lock PEA, and Nextcloud Calendar. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Simple Calendar Landing Page
1

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Email 99 social mentions
Calendar Lock PEA Landing Page
2

Calendar Lock PEA

Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Encryption
Nextcloud Calendar Landing Page
3

Nextcloud Calendar

The Calendar app is a user interface for Nextcloud's CalDAV server.
Pricing:
- Open Source
#Calendar #Email #Appointments and Scheduling 4 social mentions
Compass Calendar App Landing Page
4

Compass Calendar App

Calm calendar for productive people
Pricing:
- Open Source
#Calendar #Calendar And Scheduling #Calendar App
Calcurse Landing Page
5

Calcurse

Calcurse is a calendar and scheduling application for the command line.
Pricing:
- Open Source
#Task Management #Project Management #Todos 9 social mentions
Mailspring Landing Page
6

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions
Tutanota Landing Page
7

Tutanota

Get your encrypted mailbox for free.
Pricing:
- Open Source
#Email #Email Clients #Enterprise Communication 177 social mentions
gsimplecal Landing Page
8

gsimplecal

gsimplecal is a lightweight calendar application written in C++ using GTK2.
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Audio Recording
iRedMail Landing Page
9

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 3 social mentions
Cal.com Landing Page
10

Cal.com

Cal.com (formerly Calendso) is the open source Calendly alternative.
Pricing:
- Open Source
#APIs #Open Source #Calendar And Scheduling 53 social mentions
Roundcube Landing Page
11

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #Email Clients #SMTP Server 16 social mentions
FullCalendar Landing Page
12

FullCalendar

FullCalendar is an open-source JavaScript event calendar.
Pricing:
- Open Source
#Appointments and Scheduling #Calendar #Event Scheduling 14 social mentions