Microsoft Bookings

Best Self Hosted Alternatives to Microsoft Bookings

A curated collection of the 4 best self hosted alternatives to Microsoft Bookings.

Microsoft Bookings is an appointment-scheduling service in Microsoft 365 that helps businesses manage bookings, staff availability, customer-facing booking pages, automated reminders, and online meeting integration to simplify scheduling and reduce no-shows.

Alternatives List

#1
Cal.com

Cal.com

Open-source scheduling platform for booking meetings with availability, team routing, integrations, and embeddable booking pages.

Cal.com screenshot

Cal.com is an open-source scheduling and appointment booking platform for individuals and teams. It provides customizable booking pages, calendar availability, and workflows to coordinate meetings across multiple participants and organizations.

Key Features

  • Public booking pages with event types, buffers, limits, and configurable availability
  • Team scheduling features such as round-robin/collective scheduling and managed availability
  • Integrations for calendars and conferencing tools (e.g., Google Calendar, Microsoft, Zoom/Meet), plus webhooks
  • Embeddable booking components for websites and products (embed/iframe options)
  • Routing and intake forms to qualify requests and direct bookings to the right person/event
  • Payments support for paid bookings (via Stripe integration)
  • Multi-user and organization support with admin controls and role-based access options

Use Cases

  • Customer-facing appointment booking for sales, support, and professional services
  • Internal team scheduling (1:1s, interviews, office hours) with shared availability
  • Product-embedded scheduling for marketplaces or SaaS onboarding flows

Limitations and Considerations

  • Some advanced enterprise capabilities and managed services are offered as paid features; self-hosted deployments may require additional configuration for SSO, email, and integrations.

Cal.com is well-suited for organizations that want full control over scheduling UX and data while integrating with existing calendar and conferencing ecosystems. Its embeddable approach and team scheduling options make it useful both as a standalone scheduler and as scheduling infrastructure inside other products.

39.6kstars
11.5kforks
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#2
Rallly

Rallly

Self-hosted scheduling polls for finding the best time to meet, with shareable links, time zone support, reminders, and optional participant voting.

Rallly screenshot

Rallly is a scheduling and availability polling app that helps groups find the best date/time for an event. You create a poll with multiple options, share a link, and participants vote on what works for them—making it useful for teams, clubs, and families.

Key Features

  • Create scheduling polls with multiple date/time options and a shareable link
  • Participant voting to identify the best option (Doodle-style group availability)
  • Time zone-aware interface to reduce confusion for distributed participants
  • Optional participant comments/notes per poll (for clarifications and context)
  • Email notifications/reminders (requires SMTP configuration)
  • User accounts and authenticated poll management (with optional “guest” participation depending on configuration)
  • Admin/config-driven deployment options (environment variables), suitable for Docker-based hosting

Use Cases

  • Coordinating a team meeting across time zones without back-and-forth emails
  • Scheduling community/club events where attendees choose among several slots
  • Collecting availability for interviews, lessons, or small group sessions

Limitations and Considerations

  • Primarily focused on polling-based scheduling; it is not a full calendar suite (no CalDAV server or full agenda features)
  • Some functionality (notifications) depends on external email/SMTP setup

Rallly is a lightweight alternative to commercial scheduling poll tools, designed for quick event coordination with a clean web UI. It fits best when you need a simple “vote on times” workflow rather than a full booking system.

4.9kstars
489forks
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#3
OpenEMR

OpenEMR

A full-featured EHR/EMR and medical practice management system with scheduling, e-prescribing integrations, billing/claims support, patient portal, and reporting.

OpenEMR screenshot

OpenEMR is an electronic medical record (EMR/EHR) and practice management application used by clinics and healthcare providers to manage patients, clinical documentation, scheduling, and administrative workflows. It combines charting, orders, billing/claims-related workflows, and patient engagement tools in a single web application with an extensible module ecosystem.

Key Features

  • Patient charting: demographics, encounters, problems, allergies, medications, labs, documents, and clinical notes
  • Appointment scheduling with calendar views and clinic/provider/resource scheduling
  • Patient portal for messaging, document sharing, forms, and viewing clinical information (deployment dependent)
  • E-prescribing support via integrations (availability varies by region/vendor)
  • Billing and revenue-cycle features including CPT/ICD coding, fee sheets, and claims workflow support
  • Reporting and analytics (clinical, operational, and financial reports; export options)
  • Interoperability options including HL7/FHIR-oriented capabilities (configuration and modules may be required)
  • Role-based access controls and audit logging to support healthcare compliance workflows
  • Multilingual UI and configurable forms/templates
  • Extensible architecture with modules/plugins and a large community ecosystem

Use Cases

  • Small-to-mid clinics running end-to-end operations (appointments → encounters → billing)
  • Multi-provider practices needing centralized scheduling, charting, and reporting
  • Community/low-cost clinics seeking a customizable EHR with broad feature coverage

Limitations and Considerations

  • Some capabilities (e.g., eRx, clearinghouse/claims, patient portal options, interoperability workflows) depend on third-party services, local regulations, and site configuration
  • Feature breadth can increase setup/maintenance complexity; production deployments typically require careful hardening and operational processes

OpenEMR is a mature, widely adopted EHR platform with a broad clinical and practice-management feature set and strong extensibility. It is best suited for organizations that can invest in proper configuration, workflow design, and ongoing maintenance to match local clinical and regulatory requirements.

4.6kstars
2.7kforks
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#4
Easy!Appointments

Easy!Appointments

Open-source appointment scheduling software with provider services, working plans, email notifications, and Google Calendar sync for online bookings.

Easy!Appointments screenshot

Easy!Appointments is a web-based appointment scheduling application designed for businesses that need online bookings with staff/provider availability. It lets you define services, providers, and working plans, then exposes a booking page customers can use to reserve time slots.

Key Features

  • Public booking page for customers to schedule appointments based on real availability
  • Management backend for services, providers, customers, and appointments
  • Working plans, breaks, and time-slot rules to control provider availability
  • Email notifications for bookings and changes (SMTP-based)
  • Google Calendar synchronization (two-way sync via Google API) for providers
  • Multi-user administration with roles (e.g., admin/provider) and user management
  • Multi-language UI support (translations) and configurable date/time formats
  • REST API endpoints for integrating bookings with external systems

Use Cases

  • Service businesses (salons, clinics, consultants) offering online appointment booking
  • Teams with multiple staff/providers needing centralized availability management
  • Organizations integrating scheduling into an existing website/app via API

Limitations and Considerations

  • Focused on appointment booking; it is not a full CRM or payments/invoicing system
  • Google Calendar sync requires Google API credentials and configuration

Easy!Appointments provides a practical, lightweight booking workflow that can be embedded into a website and managed through an admin panel. It is well-suited for small to mid-sized organizations that want control over scheduling data and straightforward integrations.

4kstars
1.5kforks
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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