Cal.com: The Open-Source Alternative to Calendly
Scheduling infrastructure built for teams and developers. Free tier included. No per-seat fees when you choose managed hosting.
Open-source appointment booking that scales with your team
Cal.com lets individuals and businesses create public booking pages, manage team availability, and automate scheduling workflows. Over a million people use it.
Core features
- Event types: 1-on-1 meetings, collective events (find time when all participants are free), round-robin routing (auto-distribute bookings to team members)
- Availability management: multiple schedules per person, timezone detection, booking buffers, minimum notice periods, daily booking limits
- Team scheduling: shared calendars, custom routing based on attributes, workflow automation triggered by bookings
- Integrations: 70+ native apps including Google Calendar, Outlook, Zoom, Google Meet, Microsoft Teams, Stripe, PayPal, Salesforce, HubSpot, Zapier
- Automation: email/SMS reminders on booking, reschedule, or cancel. Workflows can trigger external actions via webhooks.
- Video conferencing: Built-in Cal video (no third-party tool needed), supports up to 300 participants
- Developer tools: API, webhooks, React components (Atoms), OAuth, embedded booking widgets
Who uses Cal.com
Sales teams (demo scheduling), customer support (callback booking), hiring departments (interview slots), higher education (student office hours), telehealth providers, professional services, tutoring platforms, executive scheduling, legal practices.
Self-hosting Cal.com is no longer self-serve (as of April 2026)
Cal.com moved from open-source to a commercial license in April 2026 due to sophisticated AI-powered cyber attacks. Self-hosting is now available to enterprise teams only, requiring direct engagement with the Cal.com team. For most businesses, managed hosting is the practical path forward.
Cal.com vs Calendly: What You Actually Pay
Head-to-head on features, team pricing, and total cost for a 10-person booking team.
The real cost of self-hosting
Self-hosting Cal.com means you own the infrastructure. You pay for cloud compute (€50-200+/month), handle security patching, manage backups, monitor uptime, and scale databases as usage grows. You need DevOps skills on staff, or you hire a consultant.
Cal.com's April 2026 source closure signals that the attack surface is real. Keeping a scheduling platform secure (it holds sensitive meeting data and integrates with 70 other apps) requires constant vigilance.
Managed hosting eliminates the DevOps tax
When you use managed Cal.com hosting, you pay a flat monthly fee. Backups, updates, SSL certificates, monitoring, scaling, and security patches are included. No DevOps team required. Your data stays where you specify it (EU, UK, US).
Managed options range from €9.99/month (CalendHub, turnkey) to €26/month (Opsily, EU + GDPR) to €16/month (Elestio, global). All include infrastructure and maintenance. Compare that to self-hosting: €50+/month in compute alone, plus your team's time.
Why Opsily for Cal.com
Enterprise-grade Cal.com hosting that respects data privacy and your budget
GDPR-compliant EU infrastructure
Your data stays in Germany. No US data transfers, no PATRIOT Act concerns. Article 28 Data Processing Agreement included. Meets the needs of healthcare, finance, and regulated industries operating in Europe.
No per-seat pricing
One flat monthly fee regardless of team size. Deploy Cal.com for 1 person or 100 people, pricing stays the same. Unlike Cal.com cloud or Calendly, you do not pay $10-28 per additional user.
Automated maintenance, zero DevOps
Daily backups, SSL renewal, security updates, performance monitoring, and scaling all handled by Opsily. Deploy in 3 minutes. No servers to manage, no patching overhead, no wake-up calls at 3 AM.
Built for teams who need reliability
Get Started with Opsily Cal.com Hosting
From sign-up to your first booking page in minutes.
Email and password. No credit card required for the free trial.
Search the app catalog, click Deploy. Choose your subdomain and EU region. Opsily provisions your instance.
Connect your calendar (Google, Outlook, Apple), set availability, create event types, add integrations.
Email and password. No credit card required for the free trial.
Search the app catalog, click Deploy. Choose your subdomain and EU region. Opsily provisions your instance.
Connect your calendar (Google, Outlook, Apple), set availability, create event types, add integrations.
Create your Opsily account
Email and password. No credit card required for the free trial.
Deploy Cal.com
Search the app catalog, click Deploy. Choose your subdomain and EU region. Opsily provisions your instance.
Configure your booking page
Connect your calendar (Google, Outlook, Apple), set availability, create event types, add integrations.
Share your booking link
Your public scheduling page is live. Embed it on your site, add to email signature, or share the link directly.
Opsily Cal.com Hosting Pricing
Flat-rate managed hosting. All plans include automated backups, SSL, updates, GDPR compliance, and 24/7 support. No per-seat fees, no hidden infrastructure costs.
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Trust & Compliance
Cal.com is audited and certified for regulated industries when hosted on Opsily.
GDPR Compliant
Your data stays in the EU. Article 28 Data Processing Agreement. No US data transfers.
SOC 2 Type II
Security, Availability, Processing Integrity, Confidentiality, and Privacy controls audited annually.
HIPAA Compliant
Healthcare and regulated-industry scheduling. Business Associate Agreement available.
ISO 27001 Certified
Information security management system certified. Meets enterprise compliance requirements.
Daily Automated Backups
Encrypted backups stored redundantly. Recovery in minutes if needed.
Frequently Asked Questions
Everything you need to know about Cal.com, managed hosting, and Opsily.
Cal.com is an open-source appointment scheduling platform. Individuals and teams use it to publish booking pages, manage availability, and automate scheduling. Common use cases include sales call booking, customer support callbacks, hiring interview slots, healthcare appointment scheduling, tutoring, and executive calendar management. It integrates with 70+ apps including Google Calendar, Zoom, Google Meet, Stripe, and Salesforce, so bookings can automatically create CRM records, send invoices, or trigger workflows.
Ready to deploy Cal.com without the DevOps headache?
Start your free trial on Opsily. No credit card required. Managed EU hosting, daily backups, and 24/7 support included.