Open Source Calendly AlternativesTop Appointment Schedulers and other similar apps like Calendly

The best open source alternative to Calendly is Cal.com. It's not free, so if you're looking for a free alternative, you could try Cal.com or Thunderbird Appointment. If that doesn't suit you, our users have ranked more than 100 alternatives to Calendly and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Calendly are meetergo, Easy!Appointments, Zaptime and Tymeslot.

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Most Calendly alternatives are Appointment Schedulers, but you can also narrow the list to Calendar Apps or Poll Makers. Other popular filters are Open Source and Free. You can also filter for EU-based alternatives if you prefer software from the European Union.

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Calendly alternatives page was last updated Aug 3, 2026

Cal.com
35 likes
Open-source scheduling tool offering self-hosted or hosted deployment, complete white-label branding, API-driven customization, data ownership, online booking management, flexible embedding, privacy, and integration for business meetings, seminars, and more.
103 Cal.com alternatives
Cost / License
Free Personal
Open Source (MIT)
Application typeApplication types
Appointment Scheduler
Calendar
Origin
United States
Platforms
Android
Self-Hosted
Google Chrome
Software as a Service (SaaS)
Cloudron
Windows
Mac
Linux
Safari
Mozilla Firefox
iPhone
Online
United States
+2
Good alternative?Is Cal.com a good alternative to Calendly?

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4comments
Cal.com vs Calendly Comments
Positive comment by Ada Byron · Jan 20, 2022
Not dependent on JavaScript and open source. Honestly, more and more businesses are locking down JS to only trusted sites or ones they use internally. Calendly depends on it, and I had some people not be able to use it because of this. Cal provides you the same kind of functionality and is much easier to manager. Calendly does have some added functionality but as I found out
Positive comment by phytographer · Apr 15, 2026
Offers multiple appointment types for free
Positive comment by tangycandy · Oct 20, 2021
Cal.com (formerly Calendly) is the BEST alternative to Calendso that I've tried, and offers additional intergrations. Their free tier is also a lot more generous, and if you want to self-host, there are simple ways of doing so via Railway.
3 of 4 comments
Cal.com is Free Personal and Open SourceCalendly is Freemium and Proprietary
Cal.com is Privacy focused and CustomizableCalendly is not according to our users
Thunderbird Appointment
19 likes
Coordinate meetings by setting your availability, sharing a booking link via email or website, planning one-off or recurring events, integrating your calendar to see appointments in one view, and simplifying scheduling by replacing manual back-and-forth.
92 Thunderbird Appointment alternatives
Cost / License
Free
Open Source (MPL-2.0)
Application type
Appointment Scheduler
Origin
United States
Platforms
Online
United States
Good alternative?Is this a good alternative to Calendly?
Calendula
5 likes
A modern Material 3 Expressive calendar for Android. Reads, writes, and reminds — on top of the system calendar, with zero network access.
Cost / License
Free
Open Source (MIT)
Application type
Calendar
Origin
Germany
EU
Platforms
Android
Android Tablet
Obtainium
F-Droid
Germany
EU
Good alternative?Is Calendula a good alternative to Calendly?
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Cal.com
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Open-source scheduling tool offering self-hosted or hosted deployment, complete white-label branding, API-driven customization, data ownership, online booking management, flexible embedding, privacy, and integration for business ...

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meetergo
3 likes
AI-powered platform automates appointment booking via email, stores data in Germany for full GDPR compliance, supports team scheduling, payments, reminders, integrations with 90+ services, offers instant setup, multi-language support, and enterprise features.
Cost / License
Freemium
Open Source (MIT)
Application type
Appointment Scheduler
Origin
Germany
EU
Platforms
Online
Software as a Service (SaaS)
Germany
EU
Good alternative?Is meetergo a good alternative to Calendly?
Easy!Appointments
10 likes
Easy!Appointments is a highly customizable web application that allows your customers to book appointments with you via the web. Moreover, it provides the ability to sync your data with Google Calendar so you can use them with other services.
95 Easy!Appointments alternatives
Cost / License
Free
Open Source (GPL-3.0)
Application type
Appointment Scheduler
Origin
Greece
EU
Platforms
Self-Hosted
Cloudron
Wordpress
Greece
EU
+1
Good alternative?Is Easy!Appointments a good alternative to Calendly?
Zaptime
Like
Personalized scheduling of your meetings and calls. Meet Zaptime! 📅 Connect your Google Calendar or iCloud Calendar, customize your availability, and wave goodbye to double bookings. Your schedule, supercharged!.
Cost / License
Freemium
Open Source
Platforms
Online
+1
Good alternative?Is Zaptime a good alternative to Calendly?
Tymeslot
2 likes
Tymeslot is a source-available, privacy-first meeting-scheduling platform built with Elixir and Phoenix LiveView. Self-host it on your own infrastructure or let us run it for you — either way, your data stays yours.
Cost / License
Freemium
Open Source (AGPL-3.0)
Application typeApplication types
Appointment Scheduler
Calendar
Origin
Estonia
EU
Platforms
Online
Self-Hosted
Cloudron
Docker
Estonia
EU
Good alternative?Is Tymeslot a good alternative to Calendly?
DFN Scheduler
1 like

an Framadate installation - Easy and fast coordination of appointments that pays special attention to the protection of data. All data used are exclusively stored in Germany.

110 DFN Scheduler alternatives
Cost / License
Free
Open Source
Application type
Appointment Scheduler
Platforms
Online
Good alternative?Is DFN Scheduler a good alternative to Calendly?

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1comment
DFN Scheduler vs Calendly Comments
Negative comment by Guest · Jun 9, 2022
Like Doodle pollot calendly
1 of 1 comments
DFN Scheduler is Free and Open SourceCalendly is Freemium and Proprietary
Meetsy
1 like
Open source online booking system.
Cost / License
Free
Open Source (Apache-2.0)
Application type
Appointment Scheduler
Alerts
Discontinued
Platforms
Self-Hosted
Good alternative?Is Meetsy a good alternative to Calendly?
hash-calendar
1 like
lightweight, client-only calendar web application. All data persists in the URL hash for instant sharing, No backend required. Optional AES-GCM password protection keeps shared links locked without a server.
Cost / License
Freemium
Open Source (MIT)
Application type
Calendar
Origin
Sri Lanka
Platforms
Online
Self-Hosted
Docker
YunoHost
Sri Lanka
+9
Good alternative?Is hash-calendar a good alternative to Calendly?
Nextcloud Polls
10 likes
A polls app, similar to doodle/dudle with the possibility to restrict access (members, certain groups/users, hidden and public).
Cost / License
Free
Open Source (AGPL-3.0)
Application type
Survey Creator
Origin
Germany
EU
Platforms
Online
Self-Hosted
Germany
EU
Good alternative?Is Nextcloud Polls a good alternative to Calendly?
Ink-In-Time
3 likes
Appointment scheduling/booking application that aims to be super-simple, and open source!
Cost / License
Free
Open Source (MIT)
Platforms
Linux
Online
Self-Hosted
Good alternative?Is Ink-In-Time a good alternative to Calendly?

12 of 17 Calendly alternatives

Open Source Calendly AlternativesTop Appointment Schedulers and other similar apps like Calendly

Alternatives list

Cal.com

Cost / License

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Cal.com vs Calendly Comments

Thunderbird Appointment

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Calendula

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meetergo

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Easy!Appointments

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Zaptime

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Tymeslot

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DFN Scheduler

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DFN Scheduler vs Calendly Comments

Meetsy

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Alerts

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hash-calendar

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Nextcloud Polls

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Ink-In-Time

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