AI tool comparison
Cal.com vs Stream
Which one should you ship with? Here is the side-by-side panel verdict, pricing read, reviewer split, and community vote comparison.
Communication
Cal.com
Open-source scheduling infrastructure
100%
Panel ship
—
Community
Free
Entry
Cal.com is the open-source alternative to Calendly with scheduling pages, team scheduling, workflows, and API. Self-hostable with full customization.
Communication
Stream
Scalable chat and activity feed APIs
100%
Panel ship
—
Community
Free
Entry
Stream provides APIs for in-app chat and activity feeds with pre-built UI components. Powers chat in thousands of apps with moderation, threads, and reactions.
Reviewer scorecard
“Open source and self-hostable scheduling with a great API. Webhooks and workflows enable custom booking flows.”
“The most complete chat API with pre-built React, Flutter, and native components. Moderation and threads are production-ready.”
“Why pay Calendly when Cal.com is open source? The feature set matches or exceeds Calendly for most use cases.”
“Expensive but building chat infrastructure from scratch is more expensive. Stream handles the edge cases.”
“Scheduling infrastructure should be open. Cal.com is the open-source standard.”
“In-app communication is essential for engagement. Stream's infrastructure removes the need to build this yourself.”
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