Cal.com

Scheduling infrastructure sold as a managed service, with a separate MIT-licensed community edition (Cal.diy) for personal self-hosting since April 2026.

Pricing Free (individuals) / Teams $12/user/mo billed yearly / Organizations $28/user/mo billed yearly / Enterprise custom

Category Scheduling

Quick take

Cal.com is the most interesting challenger to Calendly. Its open-source roots built a strong developer community, though since April 2026 the open code lives on as the separate Cal.diy edition. For mainstream business teams, Calendly's polish and brand recognition still win. Cal.com is the better choice if you need API-level control or a cheaper Teams plan. Calendly is better if you want something that works perfectly out of the box.

Cal.com scorecard

How we grade

B+ 81/100

Overall grade

Scheduling infrastructure for technical teams, with its open-source code now spun out as Cal.diy.

Idea A- Open-source Calendly alternative is a strong wedge.

Brand B Well known among developers and technical teams.

Product B+ Developer-friendly API; self-host code now lives in the Cal.diy fork.

Market fit B+ Great for technical teams building scheduling.

Adoption B+ Strong community momentum, no G2 signal here.

Features B+ Powerful API, fewer integrations than Calendly.

Security B+ SOC 2, HIPAA, and ISO 27001 on Organizations; on-prem via enterprise sales.

Value A- Broad free plan and Teams at $12 per user billed yearly.

Overview

Cal.com made its name as the open-source alternative to Calendly. In April 2026 the public repository became Cal.diy, an MIT-licensed community edition with the enterprise features stripped out, which Cal.com Inc. recommends only for personal, non-production use. The main product is now the managed cloud, free for individuals and $12/user/month billed yearly for Teams. Co-founded by Peer Richelsen and Bailey Pumfleet, Cal.com has positioned itself as the scheduling tool for developers and teams who want control over their infrastructure. The open-source approach has earned it a passionate community and rapid feature development, though it remains much smaller than Calendly in total users and market share.

Strengths & limitations

Strengths

+Generous free plan for individuals
+Developer-friendly API
+Free MIT-licensed Cal.diy edition for personal self-hosting

Limitations

–Cal.diy lacks Teams, Organizations, Workflows and SSO, and is not meant for production
–Less polished UX than Calendly
–Smaller integration ecosystem

Pricing

Free (individuals)Teams $12usermo billed yearlyOrganizations $28usermo billed yearlyEnterprise custom

Free (Individuals): 1 user, unlimited event types and calendars, 100+ apps, two-way Salesforce and HubSpot sync. Teams ($12/user/month billed yearly): round-robin and team features. Organizations ($28/user/month billed yearly): SAML SSO and SCIM, SOC 2, HIPAA and ISO 27001 compliance. Enterprise (custom, annual): SLA, dedicated database, HRIS integrations, and on-prem access via sales. Cal.diy, the MIT-licensed community edition, is free to self-host but has no enterprise features and is recommended for personal, non-production use only.

Who it's for

Developer-led teams that want an API-first scheduling platform. Companies with strict data residency requirements should ask about Cal.com's on-prem enterprise offer, since the free Cal.diy edition is not meant for production. Startups building scheduling into their own product via API. Individuals who want a capable free plan. If you want a polished, zero-configuration booking experience, Calendly is still easier.