Cal.com vs Kalender Sync
Cal.com and Kalender Sync are both scheduling & calendar tools aimed at freelancers and small businesses. Both have a free plan.
Open-source scheduling infrastructure
German-hosted calendar sync across providers, with AI assistant access
| Pricing | Open source · $12 | Freemium |
| Starting price | $12/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | 14 days | 7 days |
| Built for | Freelancers, Small businesses | Freelancers, Small businesses |
| Platforms | web | web |
| Country | US · 2021 | DE |
| Rating | — | — |
Choose Cal.com if
Individuals, startups and developers who want a free or embeddable scheduler and value open source.
- Free tier is more generous than Calendly
- Open source; self-host or embed
- Rapid feature development
Look elsewhere if: Teams that need deep Salesforce routing and enterprise support today, or who prefer a fully managed, battle-tested brand.
Choose Kalender Sync if
Freelancers and consultants in Europe who need GDPR-compliant sync across Google, Outlook, iCloud and German mail providers.
- Covers German providers that most sync tools ignore
- Privacy-friendly default shares busy time only
- GDPR DPA included even on the Free plan
Look elsewhere if: Teams wanting AI task scheduling or central admin for many users (Reclaim, Ridian).
Cal.com vs Kalender Sync pricing
Cal.com
- Free$01 user, unlimited event types and calendars
- Teams$12/user/moBilled yearly; round robin, routing forms, no branding
- Organizations$28/user/moBilled yearly; sub-teams, SAML SSO, SCIM
- EnterpriseCustomSLA, dedicated database, HRIS integrations
Kalender Sync
- Free€02 accounts, 1 sharing, Google and Outlook only, 100 AI credits
- Basic€5/mo3 accounts, 5 syncs, all providers; 2 months free yearly
- Professional€12/moUnlimited accounts and syncs, 18 months ahead, 2,000 credits
Cal.com · Key features
- Unlimited event types and bookings on the free plan
- Round-robin, collective and managed team events
- Routing forms, workflows and booking questions
- Cal Video plus Zoom, Meet, Teams integrations
- Platform APIs and embeddable atoms for building scheduling into apps
- Self-hostable open-source core
Cons
- UI polish and reliability occasionally trail Calendly
- Self-hosting is non-trivial at scale
- Some enterprise features require paid license
Kalender Sync · Key features
- One-way or two-way sync between calendars at different providers
- Supports Google, Outlook, iCloud, GMX, WEB.DE, mailbox.org and kSuite
- Busy-only, title and time, or full-detail visibility per sync
- Real-time webhooks for Google and Outlook, 5-minute polling for others
- MCP server for Claude, ChatGPT, Cursor, Zapier and n8n
- Per-calendar AI permissions with a logged history of actions
Cons
- Prices listed only in euros
- Free plan cannot sync your own calendars with each other
- Non-Google, non-Outlook providers update about every five minutes
Cal.com vs Kalender Sync: FAQ
Do Cal.com and Kalender Sync have a free plan?
Yes, both Cal.com and Kalender Sync have a free plan; paid plans add more usage and features.