Kalendar icon
Kalendar icon

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.

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Cost / License

  • Free
  • Proprietary

Platforms

  • Online
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Features

  1.  Appointment Scheduling
  2.  Scheduling
  3.  Book Appointments Online

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Kalendar information

Kalendar was added to AlternativeTo by foundingdev on and this page was last updated .
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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.

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