Booking tools
Easy!Appointments is a free, self-hosted appointment scheduler with Google Calendar sync, customer and staff management, and about a decade of development. SMS, payment processing, and managed hosting are premium add-ons.
Alternatives / Calendesk
3 open-source alternatives
3 Best Open Source Calendesk Alternatives in 2026
Looking for an open source Calendesk alternative? We compared 3 open source scheduling tools by license and scope. Cal.diy is the self-hosted community edition of Cal.com, Rallly coordinates group polls, and Easy!Appointments is a classic booking scheduler.
Written by Maxime DERAME
Last updated:
Best Calendesk alternatives at a glance
| Alternative | Best for | License |
|---|---|---|
| Cal.diy (Cal.com community edition) | Personal scheduling (not for production) | MIT |
| Rallly | Group scheduling polls | AGPL-3.0 |
| Easy!Appointments | Classic booking scheduler | GPL-3.0 |
How we chose these Calendesk alternatives
We looked for open-source tools that handle booking and appointments. We verified each project's license, recent activity, stars, and self-hosting in its repository. See our methodology for the full criteria.
Personal scheduling and polls
Cal.diy is the community edition of Cal.com with availability rules, calendar and video integrations, and an API, but it lacks team features, SAML SSO, and workflows. Rallly coordinates group events by finding a time that works for everyone, with no account required.
Important: Cal.diy
Cal.diy is not recommended for production or commercial use.
Maintenance status
All three are actively maintained.
Why look for a Calendesk alternative?
Calendesk is a proprietary booking platform priced per plan. Open-source schedulers avoid per-seat fees, but customer-facing features such as payments and SMS may be add-ons.
cal.diy
Cal.diy is the community-driven, fully open-source edition of Cal.com, a fork with all enterprise code removed. It offers event types, recurring bookings, availability rules, calendar sync with Google, Outlook, Apple, and CalDAV, video conferencing with Zoom, Google Meet, Teams, and Jitsi, payments, webhooks, and a REST API. Teams, Organizations, Insights, Workflows, and SSO are not included, and it is recommended for personal, non-production use.
49.2K15.4KMITSelf-hosted
Pricing: Free and open source; Cal.com's hosted and enterprise versions are paid.
- Full booking features with many calendar and video integrations
- 100% MIT with no license key
- Large community
- No Teams, Organizations, SSO, or Workflows
- Recommended for personal, non-production use
- Commercial use is pointed to the paid Cal.com
rallly.co
Rallly is an open-source scheduling and collaboration tool for organizing events and meetings. Participants vote on date and time options with real-time updates, no account is required, and it focuses on privacy and ease of use.
5.3K575AGPL-3.0Self-hosted
Pricing: Free self-hosted; hosted plans may be paid.
- No account required for participants
- Real-time polling and customizable time slots
- Translated into 10+ languages
- Group polls, not booking pages like Calendly
- AGPL-3.0 license
easyappointments.org
Easy!Appointments is a self-hosted appointment scheduling system with customer and staff management, services, Google Calendar synchronization, email notifications, waiting lists, multi-language support, and a mobile-responsive interface. Optional paid premium features and services are available.
4.5K1.6KGPL-3.0Self-hosted
Pricing: Free and open source; optional premium features and professional services.
- Customer, service, and staff management
- Simple self-hosted installation
- Google Calendar sync
- Less modern interface and fewer integrations than Cal.diy
- Some premium features are paid
Compare Calendesk alternatives
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| Cal.diy (Cal.com community edition) | Scheduling | MIT | Yes | Personal use |
| Rallly | Polling | AGPL-3.0 | Yes | Finding group times |
| Easy!Appointments | Booking | GPL-3.0 | Yes | Service businesses |
Which one should you choose?
Want a booking scheduler for a service business
Easy!Appointments has staff management and Google Calendar sync.
Want to find a time for a group
Rallly needs no account and updates in real time.