The Open Source Calendly Alternative

Self-hosted or hosted by us. White-label by design. API-driven and ready to be deployed on your own domain. You are in control of your events and data.


Rick Astley

Quick Chat

10 minutes

Book me and I will never give you up.
Calendso will never let you down.
Open Source will never run around and desert you.

August 2021

Supported by amazing companies

See how we compare to other alternatives.

We're not making this up. is really just that good.
Doubts? Join our Slack and ask our customers.

Calendso LogoCalendlySavvyCalNylas
Pricing Free or $12/monthFree or $12/month$12 or $20/monthUsage-based ($$$)
Open Sourceβœ…βŒβŒβŒ
Self-Hosting (i.e. in Europe πŸ‡ͺπŸ‡Ί)βœ…βŒβŒβŒ
Runs on AWS GovCloud or Google Cloud for Govermentβœ…βŒβŒβŒ
White-label / βœ…βŒβŒβŒ
Includes Video Conferencingβœ…βŒβŒβŒ
Infrastructure Readyβœ…βŒβŒβœ…
Full Data Ownershipβœ…βŒβŒβŒ
Open API & Developer SDKβœ…βŒβŒβœ…
Free Zoom Integrationβœ…βŒβŒβŒ
Shareable Linksβœ…βœ…βœ…βŒ
Opt-in Bookingsβœ…βŒβŒβŒ
Embeddable UIsβœ…βœ…βœ…βŒ
HIPAA compliant βœ…βŒβŒβœ…
Longevity Guaranteeβœ…βŒβŒβŒ

Built for teams that need more control.

Let's face it: Calendly and other scheduling tools are awesome. It made our lives massively easier. We're using it for business meetings, seminars, yoga classes and even calls with our families. However, most tools are very limited in terms of control and customisations.

100% White-label

For most teams, scheduling is a core part of the product. We get rid of any design restrictions that come with alternatives.

100% Customizable

Integrate Calendso with your platform using our open API, built in customisation options and range of embed options.

100% in Control

You are in control of your events, your customer data and your costs. A DSGVO, GDPR & CCPA compliant calendly alternative.

Say hello to unlimited customization

When the classic iframe embed isn't enough, you might want to try Calendso. Design, modify and adapt it your way.

Open API
Webhooks & Integrations
Custom Themes

β€œCalendso gives you greater control and was designed to be as versatile as possible β€” design and modify it your way. Once you start using it, you start wondering how you previously coped without it.”

Damian Harateh
Damian Harateh, Software Engineer at IBM

Open to anyone. Fork it, twist it. Flip it.

Join the community and help us build the best open source communications protocol for humans.

This open source project was born during #ODF6 and we're committed to give developers, small businesses and enterprise the power to connect with anyone and make friends or business.

GitHub repository

No foreign branding. It's about you.

Calendso is whitelabel by design, regardless of if you use our hosted solution, or self-host it.

Confidently build Calendso into your business, while still maintaining your own branding to customers.

Calendso is one of the most exciting new open source projects. Open source can be an amazing shortcut to iterate super fast. Self-hosting is a great way to take ownership of the products you use.

Job, Co-founder and CEO,
Calendso user interface

Connect to the services you love.

Calendso comes with plenty of integrations, as well as the ability to build custom integrations for any platform.

Google Calendar

Google Calendar

Create new Google Calendar events automatically and check for busy times.

Outlook Calendar

Outlook Calendar

Automatically create new events in Outlook and check for your busy times.



Automatically create Zoom meetings for new bookings and invite your guest.



Automatically schedule meetings for new bookings and send invites.



Create a new GoToMeeting automatically and invite your guest.



Automate tasks in other apps when new events are scheduled.


β€œWhile looking for a scheduling platform, we found this amazing open source project. Calendso is the new way of connecting people around the world, built by an incredible community with amazing tech stack.”

Mehmet Arziman
Mehmet Arziman
CEO, home-iX

β€œCalendso can connect billions of people around the world with open source running their daily business scheduling events. You guys at Calendso are crazy and it feels amazing being part of that.”

Ralf Roeber
Ralf Roeber
Managing Partner, Amvara

The right choice for small startups to enterprise or goverment agencies.

Calendso is designed to make calendar scheduling work for everyone, no matter your organisation's size or use case.

For startups

Open source projects have been one of most important things for the early stage ecosystem and enable startups to grow without massive monthly costs.

For enterprise

Dealing with sensitive user data can become a problem with third-party SaaS providers. Uptime reliability is another reason to trust in your own hosted instances.

For government & healthcare

Self-hosting allows government agencies and healthcare providers to meet compliance and regulatory requirements, and ensure the highest standard of security.

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Calendso screenshot