Kalendar
Kalendar is a free, open-source scheduling tool that offers premium features like custom branding, unlimited event types, and two-way calendar sync without a subscription. You can vibecode any feature you want using the founding.dev platform.
Cost / License
- Free
- Proprietary
Platforms
- Online
Features
- Appointment Scheduling
- Scheduling
- Book Appointments Online
Kalendar News & Activities
Recent activities
POX added Kalendar as alternative to Cal.com, Thunderbird Appointment, Notion Calendar and OurCal- foundingdev added Kalendar
Kalendar information
Developed by
Founding Dev Licensing
Proprietary and Free product.Alternatives
51 alternatives listedSupported Languages
- English
AlternativeTo Category
Office & Productivity
What is Kalendar?
Stop paying for scheduling software. Kalendar is the 100% free, open-source alternative to Calendly, built to give you premium scheduling features without the monthly fees.
Designed for developers, founders, and professionals who want full control over their tools, Kalendar provides a professional booking experience that you can self-host or use directly.
Key Features:
-
Unlimited Event Types: Create as many meeting styles as you need (15-min calls, 1-hour consultations, etc.) without limits.
-
Custom Branding: Remove the "Powered by" branding and use your own logo, colors, and identity for free.
-
Two-Way Sync: Seamlessly integrates with Google Calendar and Outlook to prevent double bookings.
-
Automated Workflows: Send branded confirmation emails, reminders, and follow-ups automatically.
-
Flexible Availability: Set custom hours, buffers, and minimum notice periods.
Why Kalendar? Built by Founding.dev, Kalendar is part of a movement to empower users to own their software stack rather than renting it. It is completely open-source, meaning you have full transparency and zero vendor lock-in.