What technology does Cal.com (cal.com) use?
Cal.com is an open-source scheduling platform for booking meetings and appointments, offered as a hosted service and as self-hostable software.
Observed live from cal.com on July 28, 2026.
Detected stack
Technology signals read from cal.com's public homepage and response headers. Best-effort detection, not a definitive stack list.
Server header: cloudflare
Security-header grade
A live check of the HTTP security-response headers cal.com sends, the same class of signal as securityheaders.com. Present headers score points; missing ones do not.
What Cal.com is used for
- Meeting scheduling
- Appointment booking
- Team round-robin scheduling
- Embedded booking pages
Alternatives to Cal.com
FAQ
What technology does Cal.com use?
The hosting, CDN and framework signals we can detect from cal.com's public HTTP responses are listed in the "Detected stack" section above. They are read from the site's own responses at load time, so they reflect what Cal.com exposes publicly, not a definitive or complete stack list.
Is cal.com safe?
This page reports cal.com's publicly observable security-header hygiene as a letter grade, shown above. Security headers are one signal of good front-end practice, not a full security audit, and they say nothing about Cal.com's internal systems or data handling. Treat the grade as informational.
What are the best alternatives to Cal.com?
Widely used alternatives include Calendly, SavvyCal, Google Appointment Scheduling. The right choice depends on your workflow, budget and team size.
Is your own app leaking data?
Header hygiene is the surface. LeakRank checks what a stranger can actually read from your app. Paste your URL, free, in 30 seconds.
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