Comparison

Koalendar vs Cal.com

Koalendar and Cal.com both land on Worth it.

Koalendar

Worth it

Confidence: High

Buy if you're a tutor, coach, or small business wanting simple booking links . the free tier is genuinely unlimited.

Worth it

Confidence: Medium

Buy if you're an individual, small team, or developer wanting a free, deeply customizable scheduler . the free tier makes trying it riskless.

Koalendar versus Cal.com
Compare	Koalendar	Cal.com
Verdict	Worth it	Worth it
Best for	Tutors and coaches	Individuals wanting a free booking link
Who it's not for	Enterprises needing round-robin routing and admin controls	Open-source and self-hosting fans . went closed source in 2026
Privacy	SOC 2 Type II compliant; one CVE affects the WordPress plugin, not the core scheduling app.^⁸	SOC 2 Type II, ISO 27001, GDPR, CCPA, and HIPAA options with public reports; 2026 access-control flaws reported by researchers.
Support quality	No support evidence found in sources	No support-quality evidence in sources
Public sentiment	Users consistently praise Koalendar's simplicity and free unlimited plan, especially tutors and solo professionals.^⁵	Users praise ease of use and consolidated bookings, though independent review volume trails Calendly's.
Biggest gotcha	CVE-2024-11855: stored XSS in the WordPress booking widget, fixed in 1.0.3. Update the plugin if you embed it.^⁹	Closed-source pivot ends the self-hosting path; plan an exit if you rely on the codebase.¹⁵