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Calendly Acuity Scheduling

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Productivity Business Tools Calendar Scheduling Appointment Booking Meeting Management

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Last Updated: 08-28-2026 03:13 PM (UTC)

Tymeslot

Built on Elixir's fault-tolerant OTP runtime, Tymeslot delivers the complete scheduling toolkit that Calendly charges for and Cal.com relicensed away from open source in 2026. Share one booking link and let clients pick available slots — your calendar stays synchronized and double-bookings disappear automatically through real-time availability checking against Google Calendar, Microsoft Outlook, and any CalDAV server including Nextcloud. Meeting types support configurable durations, buffer times, and availability windows that clients can book without email back-and-forth. Phoenix LiveView powers the real-time UI with WebSocket connections that update instantly as bookings arrive, without client-side JavaScript framework overhead. The platform attaches Zoom video rooms to confirmed bookings through your own Marketplace app credentials, sends confirmation and reminder emails via SMTP, Postmark, SendGrid, Mailgun, or AhaSend, and supports custom booking page themes with embed options for integration into existing websites. Circuit breakers, connection pooling, and graceful degradation maintain availability during provider outages. Authentication supports local accounts, GitHub OAuth, and reCAPTCHA protection on public booking forms. Self-hosting deploys as a single container with PostgreSQL embedded — no separate database container required. Two named volumes persist uploads and database state, while the same image powers the managed cloud at tymeslot.app so self-hosted users get identical features without a crippled community edition. Deploy via Docker, Cloudron with automatic updates, or Railway from a community template. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

Tymeslot
Tymeslot
Tymeslot
Tymeslot
Tymeslot

Benefits

  • Complete Product, No Feature Gates
  • The self-hosted image is the exact same code running the managed cloud. Calendar sync, payments, themes, embeds, and integrations all work without a hosted-only feature wall or crippled community edition.
  • Single Container with Embedded Database
  • Phoenix application and PostgreSQL run side by side in one container. Two named volumes persist all state, eliminating the complexity of managing separate database containers for simple deployments.
  • Fault-Tolerant Elixir Runtime
  • Built on Elixir's OTP supervision trees with circuit breakers, connection pooling, and graceful degradation. The scheduling engine keeps running through provider outages without dropping booked appointments.
  • Multi-Provider Calendar Synchronization
  • Real-time availability checking against Google Calendar, Microsoft Outlook, and any CalDAV server including Nextcloud, preventing double-bookings across all connected calendars simultaneously.

Features

  • Booking Pages
  • Public scheduling links where clients select duration, choose available time slots, and confirm bookings without email exchanges. Custom themes and website embeds supported.
  • Calendar Sync
  • Bidirectional synchronization with Google Calendar, Microsoft Outlook, and CalDAV providers including Nextcloud. Real-time availability prevents conflicts across all connected accounts.
  • Zoom Video Rooms
  • Automatically attaches Zoom meeting links to confirmed bookings using your own Zoom Marketplace app credentials, eliminating manual meeting creation for every appointment.
  • Automated Email Notifications
  • Booking confirmations and reminders via SMTP, Postmark, SendGrid, Mailgun, or AhaSend with configurable templates and timing for reliable client communication.
  • LiveView Real-Time UI
  • Phoenix LiveView delivers instant updates via persistent WebSocket connections as bookings arrive, without heavy client-side JavaScript frameworks or polling.