What is Kalender Sync?

Kalender Sync is a Scheduling & calendar tool: German-hosted calendar sync across providers, with AI assistant access.

How much does Kalender Sync cost?

Kalender Sync uses a Freemium model; see the vendor's pricing page for current plans.

What are the best alternatives to Kalender Sync?

Community-listed alternatives to Kalender Sync include Reclaim.ai, Motion, Notion Calendar, Calendly.

Does Kalender Sync have a free trial?

Yes, Kalender Sync offers a 7-day free trial.

What does Kalender Sync integrate with?

Kalender Sync integrates with Google Calendar, Microsoft Outlook, Apple iCloud, mailbox.org, Infomaniak kSuite, Claude and more.

Which platforms does Kalender Sync support?

Kalender Sync is available on web.

Kalender Sync

German-hosted calendar sync across providers, with AI assistant access

FreemiumScheduling & calendar Personal productivity

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Kalender Sync is a scheduling & calendar tool for Freelancers and Small businesses, offered as freemium. Founded in Germany in . Popular alternatives include Reclaim.ai, Motion, Notion Calendar.

About Kalender Sync

Kalender Sync is a calendar sync service from PPJ Venture Labs UG in Munich, Germany, built by Paul Koch and Julius Hasenzahl. It mirrors events across providers so colleagues, clients or family see when you are busy, and connects calendars to AI assistants. Data is stored on Hetzner servers in Nuremberg, with a GDPR data processing agreement included for business use.

Providers include Google, Outlook and Microsoft 365, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Infomaniak kSuite and iCal feeds. Each connection syncs one way or both ways and shares busy-only (the default), title and time, or full details. Google and Outlook update in real time via webhooks; other providers are polled about every five minutes. A built-in MCP server lets Claude, ChatGPT, Codex, Cursor, Zapier and n8n check availability and create events, with per-calendar permissions and an action log. Free covers two accounts and one sharing, Basic adds all providers and five syncs, and Professional removes the limits.

It fits freelancers, coaches and interim managers juggling client calendars, especially on German providers. Reclaim bundles Google and Outlook sync into a wider AI scheduler, and OneCal focuses on sync alone. Prices are in euros only, and Free cannot sync your own calendars with each other.

Kalender Sync launched on Product Hunt on October 22, 2026; no rank was visible when checked, and the makers offered launch visitors 50% off the first annual bill. Buying tip: new accounts get seven days of Professional without a card, and yearly billing charges 10 months for 12.

Key features of Kalender Sync

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
Hosted in Nuremberg, Germany, with a GDPR DPA included
Custom labels for blocked slots in shared calendars

Pros and cons

Pros

Covers German providers that most sync tools ignore
Privacy-friendly default shares busy time only
GDPR DPA included even on the Free plan
Low prices with two months free on annual billing
AI assistants can read and write calendars under clear permissions

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
Syncs only three months into the past
Team administration requires the separate Ridian product

Kalender Sync pricing

Kalender Sync uses a freemium model. A 7-day free trial is available.

Plan	Price	Includes
Free	€0	2 accounts, 1 sharing, Google and Outlook only, 100 AI credits
Basic	€5 / mo	3 accounts, 5 syncs, all providers; 2 months free yearly
Professional	€12 / mo	Unlimited accounts and syncs, 18 months ahead, 2,000 credits

Source: kalender-sync.de · checked on Oct 22, 2026

How Kalender Sync compares in Scheduling & calendar

Rank by votes: #1 / 17
Starting price: $0
Free alternatives: 2

Kalender Sync ranks #1 of 17 scheduling & calendar tools by community votes and is not directly comparable on price.

Common use cases

1Blocking work calendar time when private appointments are booked
2Showing a client's Outlook your availability from Google Calendar
3Combining calendars from several companies as an interim manager
4Letting Claude or ChatGPT find free slots and create meetings
5Sharing busy times with family without revealing event details

Best for

Freelancers and consultants in Europe who need GDPR-compliant sync across Google, Outlook, iCloud and German mail providers.

Not ideal for

Teams wanting AI task scheduling or central admin for many users (Reclaim, Ridian).

Integrations

Google Calendar
Microsoft Outlook
Apple iCloud
mailbox.org
Infomaniak kSuite
Claude
ChatGPT
n8n

Our take

Kalender Sync is a focused, inexpensive and privacy-conscious way to keep calendars across providers in sync, and its MCP access is a useful extra. Basic at five euros covers most freelancers; choose Professional only if you manage many accounts or need 18 months of future sync.

FAQ

What is Kalender Sync?: Kalender Sync is a Scheduling & calendar tool: German-hosted calendar sync across providers, with AI assistant access.
How much does Kalender Sync cost?: Kalender Sync uses a Freemium model; see the vendor's pricing page for current plans.
What are the best alternatives to Kalender Sync?: Community-listed alternatives to Kalender Sync include Reclaim.ai, Motion, Notion Calendar, Calendly.
Does Kalender Sync have a free trial?: Yes, Kalender Sync offers a 7-day free trial.
What does Kalender Sync integrate with?: Kalender Sync integrates with Google Calendar, Microsoft Outlook, Apple iCloud, mailbox.org, Infomaniak kSuite, Claude and more.
Which platforms does Kalender Sync support?: Kalender Sync is available on web.
Who is Kalender Sync for?: Freelancers and consultants in Europe who need GDPR-compliant sync across Google, Outlook, iCloud and German mail providers.

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