Cal.com
Open-source scheduling that you own and control
Overview
Cal.com is what happens when the Calendly model meets open-source principles. Unlimited event types, unlimited bookings, team scheduling, and round-robin routing - features that cost money on proprietary platforms - are available free on Cal.com's open-source plan.
For teams embedding scheduling into their product, Cal.com's API and embed options are significantly more flexible than alternatives. White-label the booking experience, embed it natively in your app, or build custom scheduling flows using the API. Your scheduling infrastructure becomes a feature rather than a redirect to a third-party page.
The collective and round-robin scheduling modes handle real team use cases elegantly. Sales teams can distribute leads across reps automatically, support teams can manage coverage schedules, and agencies can let clients book with any available team member.
Key Features
Unlimited Bookings
No limits on events, bookings, or calendars on any plan
Open Source
Full source code access with self-hosting option
Team Scheduling
Round-robin, collective, and managed availability for teams
Embeddable
Embed scheduling widget in your website or product
API Access
Full API for building custom scheduling experiences
Integrations
Google Calendar, Outlook, Zoom, Stripe, and more
Why We Recommend Cal.com
Cal.com gives you Calendly-level functionality with open-source flexibility. For startups embedding scheduling into their product, the API and customization options are leagues ahead of proprietary alternatives.