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BekahHW for OpenSauced

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Three open source alternatives to Calendly

Today is day 12 of my 29 Days of Open Source Alternatives series, where I'll be exploring open source alternatives to proprietary software in the categories of Game Development and Multimedia, Development Tools and Platforms, Productivity and Collaboration Tools, and more. If you'd like to see the list of the open source alternatives I'll be covering this month, head over to my 29 Days of Open Source Alts Page or if you want more open source to learn-to-code programs, check out this list. This is our first post in the Productivity & Collaboration Category.

Chances are, you either have a calendar schedule or you've interacted with someone else's scheduler. I have been incredibly resistant to having one myself, although I have tried (and didn't love) Calendly in the past to help schedule podcast episodes. At this point, it's necessary for me to have a way to easily schedule meeting, kids' events, and whatever else is happening. To do this, I investigated three open source alternatives to Calendly:, Fossify Calendar, and Easy!Appointments.

Features & Open Source Support

Fossify Calendar

A simple calendar with events, customizable widgets and no ads.

Designed with privacy and simplicity in mind, it focuses on a key set of features, available on Google Play, F-Droid, and IzzyOnDroid. On their readme, they share the following features:

  • Ad-free and private
  • Flexible and customizable
  • Seamless syncing
  • Personalize your planner
  • Vibrant widgets
  • Effortless day management
  • Import celebrations
  • Filter views
  • Multiple views
  • Material design elegance

Despite not having a website for their product, Fossify Calendar has continued support from contributors.

Fossify oss support

  • ๐ŸŒ  336
  • ๐Ÿ‘€ 8
  • forks: 27
  • license: GPL-3.0

Meet, the event-juggling scheduler for everyone. Focus on meeting, not making meetings. Free for individuals. offers a comprehensive, API-driven scheduling infrastructure, which creates opportunities for customization and integration with other tools like Google Calendar and Zoom. It offers a variety of event types, including, secret events, availability schedule, minimum notics, requires confirmation, recurring events, and more. There's also an option for paid bookings, dynamic group links, and more options with their app store. has by far, the most active open source community and support for their project, and maybe that's reflected in the number of features they offer as well..

Open Source Activity

  • ๐ŸŒ  27.2k
  • ๐Ÿ‘€ 152
  • forks: 6.1k
  • license: AGPLv3 and Commercial License


SCHEDULE ANYTHING. Let's start with easy! Get the best free online appointment scheduler on your server, today.

Easy!Appointments supports online booking for individuals or teams, and offers features like: appointment and customer management, services and service providers that are configurable, business workflow and booking rules, Google calendar synchronization, email notification support, group sessions support, API and webhook interfaces for automations and integrations, and more.

Despite a steady increase in starts from 2016 until now, Easy!Appointments seems to be slowing down. You can see by the contributions graph below, but also if you go to the repository, code hasn't been merged in during the last two months.

Easy!Appointments oss support

  • ๐ŸŒ  3k
  • ๐Ÿ‘€ 155
  • forks: 1.2k
  • license: GPL-3.0

Comparison with Calendly

Feature Fossify Calendar Easy!Appointments Calendly
Customization Moderate High High Moderate
Integration Limited Extensive Moderate Extensive
Self-hosting Yes Yes Yes No
Privacy Focus High Moderate Moderate Moderate
Cost Free w/ paid customizations Free / Paid Free Free / Paid

Additional Considerations

If you're trying to make a decision, about which to pick, here are some of my additional thoughts:


  • Privacy: If privacy is your top concern, Fossify Calendar might be a good starting point. However, also offers good privacy features.
  • Customization: For more customization and integrations, or Easy!Appointments could be better options.
  • Self-hosting: If you need complete control and prefer self-hosting, all three options offer that capability.
  • Team Support: Easy!Appointments and offer features catering to teams, while Fossify Calendar seems currently focused on individual users.
  • Technical expertise: Consider your comfort level with technical setup and troubleshooting, especially if self-hosting.
  • Budget: While all offer free plans, some features might require paid upgrades in and Easy!Appointments.


Depending on your needs, there will be different decisions for everyone here. I will say, as a recent user, I'm finding the process to be very positive, but I'm only using the most basic features. I'm looking forward to implementing more of their offerings soon for some of my upcoming projects though! If you have an open source productivity tool you'd like to recommend, drop it in the comments below.

Top comments (6)

michaeltharrington profile image
Michael Tharrington

This is really well-timed! We actually just dropped our Calendly subscription... gonna have to look into this!

bekahhw profile image

Oh nice! Iโ€™d love to know what you go for.

suess profile image

One of the OGs, Rainlendar! This deektop OSS calendar system going back to early 2000s even synced Outlook back then. It shined bright when used with Litestep, or your vanilla WinOS explorer

lymah profile image

Thanks for sharing.

a5r0n profile image
aaron don't have we hooks and API integration when you self hosting. It's requires enterprise licence..

bekahhw profile image

Hmmm. I assumed the "free" label meant that you had at least some capabilities.

webhooks free