Open Source Calendly Alternative: Cal.com and Beyond
Cal.diy is the most feature-rich open-source alternative to Calendly. No 6-calendar limit. No compliance cliff. Full data control. We host it: you own it.
Why Teams Are Leaving Calendly in 2026
Calendly sets a 6-calendar-connection hard cap at every tier, including Enterprise. That means no more than 6 Google Calendars, Outlooks, or iCloud calendars combined—ever.
For a 5-person team needing SSO and HIPAA compliance, Calendly's Enterprise tier costs $15,000 per year minimum. The Teams plan costs $960 per year. That is a 1,460% price jump for a single feature.
In December 2024, Calendly laid off 70 employees (13% of workforce), including engineering. Product development slowed. EU organizations cannot use Calendly—it has no EU data residency option.
Every team we talk to is evaluating alternatives for the same reasons: hard caps on features, cost creep, and data trapped in a US SaaS cloud.
Cal.diy solves all three.
Calendly vs. Cal.diy: Feature and Cost Comparison
Cal.diy removes the hard limits and compliance cliffs built into Calendly.
Calendly pricing as of September 2026. Cal.diy is free; Opsily managed hosting starts at €30/mo.
Open-Source Calendly Alternatives Compared
Cal.diy leads the pack with 48.7K GitHub stars and 981 contributors. It is the community edition released after Cal.com went closed-source in April 2026.
Cal.diy (48.7K stars, MIT license) The most complete open-source Calendly replacement. Unlimited booking pages, calendar sync (Google, Outlook, iCloud, CalDAV, Nextcloud), video integrations (Zoom, Google Meet, Teams, Jitsi), Stripe and PayPal payments, API v2, and webhooks. Single-organizer focus (no teams in the community edition). Last commit 1 day ago.
Deployed with Docker/PostgreSQL/Redis. Requires DevOps or a managed host like Opsily.
Easy!Appointments (4.4K stars, GPL-3) Focused on multi-provider service scheduling: clinics, salons, consultancies, tutoring centers. Built in PHP; uses MySQL. Latest version 1.6.0 (released May 27, 2026).
Strength: handles multiple staff members and resource scheduling out of the box. Weakness: not a direct Calendly replacement, oriented toward appointment queues, not booking links for teams.
Nextcloud Appointments (1.2K stars, AGPL-3) A lightweight booking app that lives inside Nextcloud. Good for teams already on Nextcloud (intranet portals, document collaboration). Single-organizer model. Part of the Nextcloud ecosystem.
Rallly (5.3K stars, AGPL-3) Doodle-style group polling for availability, not booking links. Free for 1 user; paid tiers at $49/5 users. Different use case from Calendly—better for team scheduling, worse for client bookings.
Bottom line: Cal.diy is the honest #1 choice for Calendly parity. All others are specialized tools for different workflows.
Why Opsily for Your Open Source Calendly Alternative
Managed hosting removes the DevOps tax. Own your data. Pay one flat price.
No vendor lock-in
Cal.diy runs on your infrastructure or ours. Export your data. Move anytime. No proprietary code tying you to one provider. MIT license means you own the tool.
EU data residency
Your booking data stays in the region you choose. GDPR compliant. No US cloud giants. No third-party access. You control where it lives and who touches it.
Predictable costs
One flat monthly fee. No per-seat surprises. No compliance cliffs. No surprise bills for overages. The same price covers your entire team, forever.
Built for teams who need reliability
Deploy Cal.com in 3 Minutes
From signup to your first booking link. No DevOps. No credit card required for the trial.
Email and password. That is it. No verification hurdles, no credit card upfront.
Link Google Calendar, Outlook, iCloud, or any CalDAV service. Cal.com syncs availability in real time.
One click. Customize colors, add a booking form, set payment collection. Your link is live immediately.
Email and password. That is it. No verification hurdles, no credit card upfront.
Link Google Calendar, Outlook, iCloud, or any CalDAV service. Cal.com syncs availability in real time.
One click. Customize colors, add a booking form, set payment collection. Your link is live immediately.
Create an account
Email and password. That is it. No verification hurdles, no credit card upfront.
Connect your calendar
Link Google Calendar, Outlook, iCloud, or any CalDAV service. Cal.com syncs availability in real time.
Create your booking link
One click. Customize colors, add a booking form, set payment collection. Your link is live immediately.
Share and start booking
Send your link to clients. Bookings appear on your calendar. Automations fire: email confirmations, Slack notifications, Zapier workflows.
The Calendly HIPAA cliff
Teams on Calendly Teams tier ($960/yr for 5 people) jump to Enterprise ($15,000+/yr minimum) for SSO and HIPAA compliance. Cal.com includes HIPAA support at all tiers.
Opsily Managed Cal.com Pricing
All plans include daily automated backups, SSL certificates, EU data centers, 24/7 monitoring, and one-click updates. No setup fees.
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Enterprise-Grade Data Control
Your booking data is yours. We handle infrastructure security so you can focus on scheduling.
GDPR Compliant
Booking data stays in EU regions you select. No US cloud transfers. Full compliance with GDPR Article 32 security requirements.
Encrypted at rest
PostgreSQL database encryption. SSL/TLS for all data in transit. Military-grade encryption keys rotated automatically.
Daily automated backups
Your database backed up 24/7 to isolated storage. One-click restore available anytime. Zero data loss guarantee.
Isolated infrastructure
Your Cal.com instance runs on dedicated, isolated servers with firewall protection, DDoS mitigation, and automated threat detection.
Frequently Asked Questions
Cal.com announced closure of its public codebase in April 2026. The community version is now Cal.diy (MIT licensed, 48.7K GitHub stars). Cal.diy includes unlimited event types, calendar sync, video integrations, payment collection, and webhooks. Cal.com Cloud (the managed tier) adds teams, routing forms, and SAML SSO. Opsily hosts both Cal.diy (self-hosted) and Cal.com Cloud (managed).
Stop paying for Calendly's compliance cliff.
Deploy a Cal.com booking system on your own infrastructure. GDPR-compliant EU hosting. 48 hours to migration from Calendly.