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Tool comparison

Kalender Sync vs. CompanionLink – desktop sync or cloud sync?

CompanionLink has synced Outlook, Google, phones and CRMs since the 1990s – as software you install on your computer. Kalender Sync is a web service that syncs calendars across providers and shares your availability with others. Here's the honest comparison.

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Background

What is CompanionLink?

CompanionLink Software, Inc. (Portland, Oregon, USA) makes sync software that moves contacts, calendars, tasks and notes between desktop apps and phones. CompanionLink for Outlook and CompanionLink for Google sync Outlook with Google two-way and are installed on a Windows PC (Windows 7, 10 or 11); there is also CompanionLink for Mac. Express and Professional editions connect CRMs such as Act!, GoldMine, HCL Notes, Salesforce and monday.com. Phones are synced via USB, Wi-Fi or the DejaCloud service and the DejaOffice app for Android and iPhone. Licences are one-time purchases (e.g. $69.95 for Outlook or Google, $149.95 for Professional) or subscriptions from $14.95 per 3 months; DejaCloud plans start at $2/month. There's a 14-day trial and a 90-day money-back guarantee.

Where CompanionLink is strong

Contacts, tasks and notes too
CompanionLink doesn't just sync calendars – it also moves Outlook contacts, tasks, notes and categories. If your whole Outlook setup needs to reach your phone, it covers more than a calendar tool.
CRM connectors
Act!, GoldMine, HCL Notes, Salesforce and monday.com can be synced with phones and Google. For teams running a classic desktop CRM, that's a rare feature.
One-time licence option
Instead of a subscription, you can buy a licence once (from $69.95) and install it on up to 3 PCs – attractive if you dislike recurring fees.

Where Kalender Sync wins

Tap a point to see the reasoning.

  • Nothing to install

    CompanionLink's Outlook and Google sync products are Windows software you install on your PC. Kalender Sync runs in the browser – connect your calendars once and the sync runs in the cloud, regardless of which computer is switched on.

  • Live sharing into other people's calendars

    Kalender Sync writes your availability directly into another person's calendar – your assistant, your team or your client – and keeps it up to date there. CompanionLink is built to sync your own data between your devices and apps.

  • Three visibility levels – Free/Busy by default

    Per sync you choose: busy only, title + time, or full details. The default is "busy only" – event details only leave your calendar if you explicitly allow it.

  • One sharing free forever

    CompanionLink offers a 14-day trial, then a licence or subscription. At Kalender Sync, one sharing is free forever on the Free plan (Google and Microsoft). Basic is €5/month (€50/year) with 3 accounts, 5 syncs and all providers; Professional is €12/month for unlimited use.

  • Broad calendar provider coverage

    Kalender Sync connects 10 provider types – Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Infomaniak kSuite and iCal feeds. GMX and WEB.DE come with a ready-made connection – no server address to type in.

  • German company, hosted in Germany

    Kalender Sync is run by PPJ Venture Labs UG and hosted at Hetzner in Germany. A DPA is included on every plan for business use – part of our terms.

  • Calendars for AI assistants

    Via the MCP connector, Claude and ChatGPT can read the calendars you share – with the same visibility control as your syncs.

When to pick which

CompanionLink is the right choice when:

  • You need contacts, tasks and notes synced along with your calendar.
  • You work with a desktop CRM like Act! or GoldMine.
  • You prefer a one-time licence installed on your own PC.

Kalender Sync is the right choice when:

  • You want calendar sync that runs in the cloud without installing software.
  • You want to write your availability live into other people's calendars, with "busy only" as the default.
  • You want the broadest provider coverage in this comparison: 10 provider types – Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Infomaniak kSuite and iCal feeds. Kalender Sync is the only tool in this comparison with ready-made connections for the German providers GMX & WEB.DE – no server address to type in.
  • You're in the EU and want a German company with a DPA on every plan.
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Ready for calendar sync without installing anything?

Connect your calendars in a few clicks – GDPR-compliant and hosted in Germany. 7 days of Professional free, no credit card.

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Currently supported providers

GoogleMicrosoftApple iCloudKKSuiteGMXWEB.DEmailbox.orgiCal-Feeds