Cal.com

Best Self Hosted Alternatives to Cal.com

A curated collection of the 4 best self hosted alternatives to Cal.com.

Cal.com is an open scheduling platform providing hosted booking pages, calendar integrations (Google/Outlook/iCal), team and round‑robin scheduling, group bookings, and workflow automation. A self‑hostable version is also available.

Alternatives List

#1
Rallly

Rallly

Open-source, self-hosted polling tool to find the best date/time with no login required.

Rallly screenshot

Rallly is an open-source scheduling poll tool that helps groups find the best date and time for events. It emphasizes a simple, login-free experience and supports self-hosting for full data control.

Key Features

  • Create polls without signing up or logging in
  • Time-slot polling with month/week views and automatic time-zone conversion
  • Email notifications and comments on polls
  • Self-hosting via the official Docker image
  • Open-source under AGPLv3 license
  • Ad-free experience and a focus on simple workflows
  • Team features include centralized billing and Spaces for multi-user usage
  • Polls can be automatically deleted after inactivity (subject to plan)

Use Cases

  • Personal scheduling: plan meetups with friends or family via quick polls
  • Team coordination: organize meetings for projects with centralized billing and spaces
  • Event planning: coordinate large group activities or community events with easy poll creation

Limitations and Considerations

  • Some advanced features (e.g., poll deadlines) are not currently supported
  • Official self-hosting is via the provided Docker image; self-hosting from raw source code is not officially supported
  • Polls may be deleted after inactivity for free users unless on Pro plans

Conclusion Rallly provides a lightweight, open-source alternative for poll-based scheduling, with self-hosting options and an emphasis on a login-free, straightforward user experience.

4.9kstars
490forks
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#2
Easy!Appointments

Easy!Appointments

Open source appointment scheduler for customer bookings, provider management, and Google Calendar sync, deployable on your own PHP/MySQL server.

Easy!Appointments screenshot

Easy!Appointments is an open source web application for managing services, providers, and customer bookings through a public booking page and an admin backend. It is designed to be customizable for different scheduling workflows and can integrate with Google Calendar for synchronization.

Key Features

  • Customer-facing booking interface for creating appointments
  • Backend management for customers, appointments, services, and providers
  • Working plans, availability settings, and booking rules
  • Google Calendar synchronization for appointments
  • Email notifications for booking-related events
  • Translated user interface for multilingual deployments
  • REST API for integrations and automation

Use Cases

  • Booking management for clinics, salons, and other service-based businesses
  • Scheduling interviews, consultations, or internal appointments with staff availability
  • Embedding a booking flow into an existing website while sharing a database

Limitations and Considerations

  • Deployment and upgrades require managing PHP version compatibility and database updates
  • Some advanced capabilities mentioned in the ecosystem (e.g., payments, SMS, extended reporting) may require additional development or premium services

Easy!Appointments provides a solid foundation for organizations that need a self-managed scheduling system with provider/service structure and calendar synchronization. It fits well for teams wanting a customizable booking application that can be integrated into existing web environments.

4kstars
1.5kforks
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#3
LibreBooking

LibreBooking

LibreBooking is an open-source scheduling system for managing resource reservations with calendars, waitlists, quotas, reporting, and role-based access control.

LibreBooking screenshot

LibreBooking is an open-source resource scheduling solution for organizations that need to manage reservations for shared resources. It provides a mobile-friendly web interface with extensibility options for custom workflows and integrations.

Key Features

  • Multi-resource booking with configurable schedules and waitlists
  • Role-based access control for administrators, resource managers, and users
  • Quotas and credit-based controls to limit and govern reservations
  • Usage reporting for tracking utilization and reservation activity
  • Responsive Bootstrap-based UI with theming support
  • Plugin-ready architecture for extending functionality
  • Calendar integration via ICS for clients like Outlook and Thunderbird

Use Cases

  • Booking shared resources such as rooms, equipment, or facilities
  • Managing reservations with approval workflows, quotas, or fair-use rules
  • Tracking utilization and producing reports for operations and planning

Limitations and Considerations

  • Requires a PHP-compatible web stack and a supported SQL database for deployment
  • Public demo environments may reset frequently and are not suitable for long-term testing

LibreBooking is well-suited for teams and institutions that need a straightforward, extensible reservation system with governance controls. It combines scheduling, access control, and reporting to help organizations manage shared resources reliably.

646stars
329forks
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#4
HiveDAV

HiveDAV

A lightweight, curl-first free/busy scheduler that syncs availability from a CalDAV calendar and can send iCal booking invites via SMTP.

HiveDAV screenshot

HiveDAV is a small, curlable free/busy scheduler that reads availability from a CalDAV calendar, stores it locally, and exposes a simple HTTP (curl) interface for availability and booking. It is designed to be run as a standalone service and is configured via environment variables. (hivedav.p0c.ch)

Key Features

  • Curl-first HTTP interface for querying week/day availability and simple booking commands. (code.in0rdr.ch)
  • CalDAV discovery and calendar fetching to import events and compute free/busy slots. (code.in0rdr.ch)
  • Local sqlite database storage for availability (single-file app.db) with atomic update flow. (code.in0rdr.ch)
  • Ability to create bookings and send iCalendar invites via configured SMTP (supports STARTTLS). (code.in0rdr.ch)
  • Simple build and deployment tooling: Makefile, Dockerfile present; runnable via go run . or containerized builds. (code.in0rdr.ch)

Use Cases

  • Provide a minimal, scriptable free/busy endpoint for teams that already use CalDAV calendars. (code.in0rdr.ch)
  • Automate room or resource booking by querying availability via curl and creating iCal invites. (code.in0rdr.ch)
  • Integrate calendar availability into lightweight websites, chatbots or shell scripts that need a curlable scheduler. (code.in0rdr.ch)

Limitations and Considerations

  • Uses the mattn/go-sqlite3 driver which requires gcc/CGO (CGO_ENABLED=1) to build; this affects static binary builds and cross-compilation. (code.in0rdr.ch)
  • CalDAV servers vary in supported REPORT/query behavior; HiveDAV fetches all events and normalizes availability locally to maximize compatibility. (code.in0rdr.ch)

HiveDAV is a pragmatic tool for teams wanting a minimal, self-hosted free/busy service that interoperates with existing CalDAV calendars and simple curl-based workflows. It focuses on robustness with a small dependency surface and straightforward configuration.

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Why choose an open source alternative?

  • •Data ownership: Keep your data on your own servers
  • •No vendor lock-in: Freedom to switch or modify at any time
  • •Cost savings: Reduce or eliminate subscription fees
  • •Transparency: Audit the code and know exactly what's running