Kalender Sync vs OnceHub
Kalender Sync and OnceHub are both scheduling & calendar tools. Kalender Sync is aimed at freelancers and small businesses, while OnceHub is aimed at small businesses and enterprise. Both have a free plan.
German-hosted calendar sync across providers, with AI assistant access
Scheduling, lead routing and chatbots for inbound sales teams
| Pricing | Freemium | Freemium · $12 |
| Starting price | Not published | $12/mo |
| Free plan | Yes | Yes |
| Free trial | 7 days | 14 days |
| Built for | Freelancers, Small businesses | Small businesses, Enterprise |
| Platforms | web | web |
| Country | DE | — · 2006 |
| Rating | — | — |
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).
Choose OnceHub if
Inbound sales and service teams that want booking, lead qualification and routing in one tool at a mid-market price.
- Scheduling, lead routing and chatbots in one product
- Routing tier costs far less than Chili Piper
- Free plan that does not expire
Look elsewhere if: Solo professionals who only need a simple booking link (Calendly, SavvyCal) or large Salesforce teams with complex routing (Chili Piper).
Kalender Sync vs OnceHub pricing
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
OnceHub
- Basic$01 user, 1 calendar, 1 booking link
- Schedule$12/user/mo$10 billed annually; unlimited links, CRM sync, payments
- Route$23/user/mo$19 billed annually; routing forms, round robin, rooms
- Engage$47/user/mo$39 billed annually; AI chatbots and live chat handoff
- EnterpriseCustom30+ users, MSA, security review, success manager
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
OnceHub · Key features
- Booking pages for one-on-one, panel, group and concurrent sessions
- Routing forms that qualify leads and assign meetings by rules
- Round robin and maximum-availability distribution across team members
- Room and resource scheduling alongside host calendars
- AI chatbots with live chat and instant-meeting handoff on Engage
- Native Salesforce and HubSpot sync plus Stripe payments
Cons
- Admin interface is denser than Calendly or SavvyCal
- Chatbots and AI features only on the top Engage tier
- Free plan limited to one user and one booking link
Kalender Sync vs OnceHub: FAQ
Do Kalender Sync and OnceHub have a free plan?
Yes, both Kalender Sync and OnceHub have a free plan; paid plans add more usage and features.