Cal.com is a leading open-source scheduling platform that allows individuals and teams to efficiently schedule appointments without falling into time-consuming email communications. The solution seamlessly synchronizes with your existing calendars and provides your contacts with personalized booking pages.
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The following are trademarks of their respective owners: Cal.com (Cal.com, Inc.). WZ-IT is an independent service provider and has no business, partnership, or contractual relationship with these companies. We offer independent migration, installation, hosting, and operations services.
Cal.com is a leading open-source scheduling platform that allows individuals and teams to efficiently schedule appointments without falling into time-consuming email communications. The solution seamlessly synchronizes with your existing calendars and provides your contacts with personalized booking pages.
As an experienced Cal.com partner, we support you in installing, configuring, and customizing this versatile scheduling solution to your individual requirements. Leverage the benefits of optimized appointment management and professional customer interaction for your business.
We install, host and operate Cal.com for your company - either on our secure, GDPR-compliant infrastructure in Germany or other locations, as well as on-premise in your own environment.
With 24/7 monitoring, backups and professional maintenance, we ensure maximum availability and reliable operation of your Cal.com instance. Note: we always operate Cal.com as a dedicated single-tenant instance per customer. Multi-tenant SaaS or white-label setups require a Cal.com Platform License – we are happy to procure it on your behalf.
Cal.com is licensed under AGPLv3 with a Platform License Exception. We therefore operate Cal.com exclusively as a dedicated single-tenant instance per customer – a multi-tenant SaaS setup would require a commercial Cal.com Platform License.
We take over full operations – installation, configuration, updates, monitoring, backups and support – on your dedicated instance; we are happy to procure a Platform License on your behalf if needed.
Automatic availability detection, time zone recognition, and prevention of double bookings for efficient and conflict-free appointment scheduling.
Create individual booking pages for different meeting types with customizable availabilities, duration, and lead times.
Bidirectional synchronization with Google Calendar, Microsoft Outlook, Apple Calendar, and other calendar services for always up-to-date availabilities.
Manage team calendars, shared availabilities, and group scheduling for efficient coordination within departments and organizations.
Configure automatic reminders, follow-up actions, and custom emails for optimized communication before and after appointments.
Customize the appearance of your booking pages with your own logos, colors, and custom domains for a consistent brand identity.
Automatically route appointment requests to the right team members based on availability, expertise, or capacity.
Seamless integration with Zoom, Google Meet, Microsoft Teams, and other video conferencing solutions for virtual meetings directly from the scheduling system.
Integrate Cal.com into your existing systems and automate processes with extensive API functions and webhook support.
See how simple and efficient Cal.com works in practice. From installation to productive use.
Professional installation on your infrastructure – on-premise, cloud or hybrid
In your data center
AWS, Azure, Hetzner & more
High-availability setup with comprehensive security and compliance features
Secure access and access control for your installation
WireGuard, NetBird or Tailscale
Keycloak, Authentik, Azure AD
TOTP, WebAuthn, YubiKey
Fail2Ban, Rate Limiting, IP Whitelisting
We set up secure VPN access to your installation – ideal for remote work and external employees.
Full-service installation with no hidden costs
Cal.com is not just a tool, it's infrastructure. We help you integrate scheduling as a native feature into your own software.
Are you a platform for doctors or consultants? We use the Platform API to create thousands of sub-accounts for your users – completely in your branding.
Booking Created -> CRM Update -> Invoice Created -> Zoom Link Generated. We orchestrate the entire process after booking.
Development of native apps for the Cal.com store. Integration of specific video providers or CRM systems directly into the booking UI.
How we implement Cal.com development in practice.
A marketplace for tutors needs booking function. Users should not leave/see Cal.com.
Deep embedding via React components. The entire booking happens on your domain, Cal.com runs invisibly in the background.
Prices for appointments depend on external factors (customer, time, complexity).
Custom app that dynamically calculates the price before checkout and passes it to Stripe.
Open source enterprise-ready for productive workloads - we run your applications with highest security standards and enterprise support
Open Source Software für geschäftskritische Prozesse erfordert professionelle Wartung, kontinuierliche Updates und enterprise-grade Support. Wir übernehmen Hosting und Betrieb von Cal.com auf unserer DSGVO-konformen Infrastruktur in Deutschland (oder optional in Ihrer Cloud) – inklusive Backups, SLAs, Telefon-Support und persönlichem Ansprechpartner. Damit Sie sich auf Ihr Kerngeschäft konzentrieren können.
Wir bieten auch maßgeschneiderte Hosting- und Entwicklungs-Lösungen für Ihre speziellen Anforderungen rund um Cal.com. Kontaktieren Sie uns für ein individuelles Angebot.
Good choice – we'll help you get started or with operations.
As a Managed Service customer at WZ-IT, you have access to our exclusive portal: Monitor your infrastructure in real-time, schedule maintenance, request quotes, and get direct support – all in one central location.
Answers to the most important questions
Topics
Cal.com is an open-source scheduling and booking platform that allows you to easily manage online appointments, meetings and bookings — both internally and externally. Perfect for service providers, agencies, teams or customers looking for a flexible, privacy-friendly and customizable solution for appointment bookings.
Cal.com is open source and can be self-hosted — giving you maximum control over data, infrastructure and privacy. Calendly is cloud-based as a SaaS service. With Cal.com you can freely customize workflows, booking pages and integrations, while Calendly is limited to the options provided by the vendor. Cal.com also offers more freedom with calendars and event types in the free plan.
Yes — the open-source version of Cal.com can be used free of charge. You only pay for your own infrastructure (hosting / server) if you self-host, or for services if you hire a service provider.
Calendar and scheduling including availability, buffer times and booking types. Integration with external calendars (Google, Outlook etc.), flexible booking forms, team scheduling, webhooks/API/integrations as well as optional video conferencing, payment processing and automations.
Cal.com is ideal for freelancers, agencies, service providers, small and medium-sized businesses and teams who want to implement their scheduling flexibly, privacy-friendly and self-hosted — or for organizations with compliance/data protection requirements.
Yes — Cal.com can be operated on your own infrastructure, e.g. on your own Linux server or VPS. This gives you complete control over your data, infrastructure and system environment.
Cal.com typically requires Node.js, Yarn (or npm), Git and a PostgreSQL database. A Linux server is recommended for production environments.
Full data control and privacy — ideal for sensitive customer data or compliance requirements. Higher flexibility: customization, custom workflows, own integrations possible. No external dependencies and often more cost-effective for long-term use.
Self-hosting requires your own infrastructure, administration (updates, backups, security), technical knowledge and ongoing maintenance. Without regular maintenance, this can be more time-consuming than a SaaS service.
Yes — as an IT service provider, WZ-IT can install, configure Cal.com for you, deploy it to your infrastructure, ensure security & data protection and also take over ongoing operation, maintenance and support.
Yes — Cal.com supports calendar integrations so you can sync available times and avoid double bookings.
Yes — Cal.com supports team management, so multiple users or employees can centrally coordinate their availability and manage appointments together.
Yes — through integrations (e.g. payment providers) you can offer paid appointments and link payment directly to the booking.
Yes — due to the open-source nature of Cal.com, you can customize booking forms, add custom fields, define workflows and modify the system according to your needs.
Yes — Cal.com supports embedding options, so booking pages or booking links can be easily integrated into other websites (e.g. via iframe or link).
Yes — with self-hosting you optionally have full control over data location and privacy. When hosting in the EU or on your own infrastructure, GDPR requirements can be better met.
You should plan for secure server configuration, SSL/TLS, regular updates, backups and possibly firewalls or access protection — especially when processing personal or sensitive data.
Cal.com allows integrations via API / webhooks — e.g. for calendar services, payment providers, automation tools or other SaaS/on-prem systems. Video conferencing or custom booking workflows can also be integrated.
Yes — Cal.com can be operated scalably. With your own infrastructure or appropriately dimensioned servers, it can also be used for medium to larger teams or organizations.
No license fees, only infrastructure costs for self-hosting. Full control over data & hosting. Great flexibility and customizability through open source. No dependency on external SaaS providers and their price/policy changes.
More questions? We are happy to help!
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Whether a specific IT challenge or just an idea – we look forward to the exchange. In a brief conversation, we'll evaluate together if and how your project fits with WZ-IT.
Leading companies trust WZ-IT
Timo Wevelsiep & Robin Zins
Managing Directors of WZ-IT
