Side-by-side open source comparison

Cal.comOpen Source

Open source scheduling infrastructure — the Calendly alternative for individuals and teams

PlankaOpen Source

Open source Trello alternative with real-time kanban

Overview

Cal.comPlanka

TypeOpen SourceOpen Source

CategoryProject ManagementProject Management

PricingFree (self-hosted)Free (self-hosted)

Self-Hostable

LicenseAGPL-3.0AGPL-3.0

GitHub Metrics

Cal.comPlanka

Stars41.5k11.9k

Forks12.9k1.2k

Contributors438154

Open Issues1.3k421

Last CommitApr 2026Apr 2026

Latest Release----

Cal.comPlanka

Health Score

93Excellent

75Good

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