Cal.diy
MIT-licensed community edition of the Cal.com scheduling codebase.
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sovereigntyCal.diy is the free, permissively-licensed fork Cal.com released in April 2026 after taking its commercial product closed-source. It carries over Cal.com's core booking engine — event types, buffer/booking-limit rules, Stripe/PayPal payments, and calendar/video integrations — under the MIT license, but the maintainers themselves describe it as community-maintained and recommend it for personal, non-production use rather than as a supported business tool.
OPEN SOURCEMITSELF-HOSTLOCAL-FIRST
LicenseMIT
PricingFree, self-hosted. No official managed hosting or support channel; Cal.com's paid hosted product is a separate, now closed-source, offering.
Open sourceYes
Self-hostableYes
Local-first dataYes
What it does well
- +Fully MIT-licensed — no open-core split, no feature paywall, free to modify or redistribute
- +Inherits a feature-rich booking engine: recurring events, seated events, payments, wide calendar/video integration list
- +REST API and embeddable booking widgets for building your own booking flow
- +Active repo (46k+ stars, commits within days) even post-fork
Where it falls short
- −Its own docs recommend it for personal use only and disclaim production readiness — 'use at your own risk'
- −No official support; the parent company no longer backs this codebase
- −Missing team/organization features, SSO/SAML, workflows, and routing forms that stayed in Cal.com's closed-source enterprise edition
- −Requires running Postgres + Redis + a Node.js host yourself — more moving parts than a single-binary app
- −Young as an independent project (forked April 2026); long-term maintenance commitment is unproven
Cal.diy as an alternative to
Where Cal.diy shows up in our comparisons, and how it ranked.
Cal.diy head-to-head
Straight comparisons against the tools people weigh it against.