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No. 23 of 197 ·Calendar apps

Clustra Calendar

Web · paid plans from $10/mo

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Freedom report

Two barsScore 7.5

  • Free tierA free tier is on its own pricing page
  • Open codeNo open-source code on record
  • Runs widely1 of 6 device platforms
  • DocumentedPlans, terms and facts published

Clustra Calendar is ranked #23 of 197 in calendar apps on Freedom251. It runs on Web. There is a free plan. Paid plans start at $10/mo.

Clustra Calendar plans and pricing

All plans
Free Free Billed yearly · cancel anytime 5 members · 1 workspace clustra.org · 22 Sept 2026
Pro $10/mo billed monthly Unlimited members clustra.org · 22 Sept 2026
Business $18/mo billed monthly Unlimited members · 10 workspaces clustra.org · 22 Sept 2026
Enterprise Not published Dedicated infrastructure and data residency · Custom contracts, SLAs, and security review · Named customer success manager · 24/7 support clustra.org · 22 Sept 2026

Compared on calendar apps

Free plan
Yes
Paid from
$10/user/mo
Scheduling links
Yes
Calendar sync
two_way

Best Clustra Calendar alternatives

See all 20
Three bars Mozilla Thunderbird Free tierOpen source No. 1Free9.0 Two bars Microsoft Outlook Calendar Free tier No. 2$1.67/mo8.2 Two bars Lark Free tier No. 3Free8.2 Two bars EGroupware Open source No. 4€21.90/mo8.2 One bar Proton Calendar Free tier No. 5Free8.0 Two bars Teamup Free tier No. 6$12/mo8.0