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Calendly Acuity Scheduling

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Self-Hosted Productivity Business Tools Scheduling Calendar Booking Appointment Management

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47,845

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14,894

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195

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Last Updated: 08-21-2026 10:48 AM (UTC)

Cal.diy

With over 47,000 GitHub stars, Cal.diy is the fully open-source community fork of Cal.com that strips away every proprietary license gate and enterprise paywall to deliver a pure MIT-licensed scheduling platform you completely own. The booking engine supports individual event types including recurring events, seated events with capacity limits, and paid bookings through Stripe and PayPal, all backed by customizable availability schedules with date overrides, buffer times, minimum notice periods, and travel schedule support. Calendar synchronization is bidirectional across nine providers — Google Calendar, Outlook and Office 365, Apple Calendar, CalDAV, Lark, Feishu, Zoho, Exchange, and ICS feeds — so every booking automatically appears on your existing calendar while blocking conflicting slots. Video conferencing links generate automatically for Zoom, Google Meet, Microsoft Teams, Webex, Jitsi, Daily.co, Whereby, and Huddle01, eliminating manual link management. The automation layer connects through webhooks, Zapier, n8n, Make, and Pipedream to CRM platforms like HubSpot, Salesforce, and Close, messaging services including Discord, Telegram, and WhatsApp, and analytics tools such as Google Analytics 4, PostHog, and Fathom. The entire application is built on the T3 stack — Next.js for server-rendered pages, tRPC for end-to-end type-safe APIs, Prisma for PostgreSQL database access, and Tailwind CSS for the responsive interface. Unlike Cal.com's open-core model, Cal.diy requires no license key and includes no gated features. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Cal.diy
Cal.diy
Cal.diy
Cal.diy
Cal.diy

Benefits

  • Zero License Keys Required
  • Every feature works immediately after deployment with no Cal.com account, API key, or enterprise license needed — pure MIT-licensed code with no commercial gatekeeping.
  • Nine Calendar Provider Sync
  • Bidirectional synchronization with Google Calendar, Outlook, Apple Calendar, CalDAV, Lark, Feishu, Zoho, Exchange, and ICS feeds prevents double-booking conflicts automatically.
  • Built-In Payment Collection
  • Collect booking fees through Stripe or PayPal with automatic payment processing, supporting paid consultations, coaching sessions, and premium appointment types.
  • Extensive Automation Ecosystem
  • Connect via webhooks to Zapier, n8n, Make, and Pipedream, with native CRM integrations for HubSpot and Salesforce and messaging via Discord, Telegram, and WhatsApp.

Features

  • Flexible Event Types
  • Create one-off, recurring, and seated event types with capacity limits, private hashed links, buffer times, and configurable minimum notice periods.
  • Video Conferencing
  • Automatically generate meeting links for Zoom, Google Meet, Microsoft Teams, Webex, Jitsi, Daily.co, Whereby, and Huddle01 on each booking.
  • T3 Stack Architecture
  • Built with Next.js, tRPC for type-safe APIs, Prisma ORM on PostgreSQL, and Tailwind CSS for a fully typed, server-rendered application.
  • Availability Management
  • Define multiple availability schedules with date overrides, travel schedules, out-of-office periods, and per-event-type booking limits.
  • CRM and Analytics
  • Native integrations with HubSpot, Salesforce, Close for CRM and Google Analytics 4, PostHog, Fathom, and GTM for visitor tracking.