Keep calendars, contacts, and tasks perfectly synchronized across all your tools

Real-time data synchronization for teams using multiple systems — without manual updates or conflicts

  • No credit card required
  • Setup in minutes
  • Built for secure business data sync

Trusted by +12,000 Customers

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Trusted by many global companies

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Easily sync multiple calendars and reduce double bookings

Sync your calendars, avoid scheduling conflicts

Google Calendar Synchronization

Sync Google Calendar with Outlook, Exchange, iCalendar, CRM or Apple systems, and business apps in real time.
Read more

Outlook Calendar Synchronization

Keep Outlook perfectly synchronized with Google Calendar, Exchange and internal scheduling tools.
Read more

Calendar Synchronization API

Add enterprise-grade calendar synchronization to your product using SyncManager API.

Read more

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Phone: +4477 00 183718
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AddSync sync with Calendars

Your tools don’t sync. Your team pays the price.

Most teams rely on multiple systems that don’t communicate properly. The result is broken workflows, duplicated work, and inconsistent data across calendars, contacts, and tasks.

One sync layer for all your business tools

Add-Sync connects your systems and keeps calendars, contacts, and tasks continuously aligned — in real time and without manual effort.

Keep every calendar perfectly in sync

Synchronize Google, Outlook, and other calendars automatically across systems with zero conflicts or missed events. Eliminate double bookings, outdated schedules, and manual updates across your entire organization.

Secure, real-time synchronization built for business-critical workflows. No more manual updates. No more inconsistent data.

One source of truth for all your contacts

Automatically sync contacts across CRM systems, email platforms, and devices in real time. No duplicates, no outdated data — just clean, consistent contact information everywhere your team works.

Secure, real-time synchronization built for business-critical workflows. No more manual updates. No more inconsistent data.

Unify tasks across all your tools instantly

Keep tasks synchronized in real time between apps, platforms, and teams without manual updates. Avoid duplicated work, lost tasks, and misaligned priorities across systems.

Secure, real-time synchronization built for business-critical workflows. No more manual updates. No more inconsistent data.

HOW IT WORKS

Set up once. Everything stays in sync automatically

Connect your tools (Google, Outlook, CRM systems, and more)

Define simple sync rules (what data syncs, where, and how)

Add-Sync keeps everything synchronized in real time

Calendar Synchronization

Reliable synchronization for business-critical workflows

  • Real-time data synchronization
  • Conflict-free updates across systems
  • Secure architecture designed for business use
  • Scales with teams and organizations

Designed to eliminate data fragmentation across modern SaaS stacks.

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The Next Generation Of Our Calendar Services

Testimonials

Our latest Review

“Finally, full control over our calendars” With AddSync, we synchronized calendars across teams working in different time zones. No more double bookings or manual availability checks.
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Gwen Johnson

SEO Manager
“Time savings from day one” Setup took just a few minutes, and everything runs automatically in the background. Our sales team always sees accurate availability, no matter which calendar they use.
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Rameli Andrea

Director of Marketing
AddSync seamlessly connects Google Calendar, Outlook, and Exchange into one reliable system. Everyone works with the same, up-to-date data. A single source of truth for the entire organization”
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Nelima Frank

Head of Operations
“Perfect for multi-location and enterprise teams” Managing multiple calendars and offices is easy with AddSync. Global configuration and synchronization priorities were exactly what we needed.
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Nepoli Dewan

IT Manager
“Flexible, secure, and enterprise-ready” Two-way sync, full control over data flow, and no calendar limits make AddSync a powerful and reliable solution for our infrastructure.
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Thomas Olsen

Software Architect
“Peace of mind in scheduling” With AddSync, meetings, tasks, and availability are always accurate and up to date. It has significantly improved communication and productivity across our teams.
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Natalia Froast

CEO

AddSync FAQ

What is AddSync?

AddSync is a tool for real-time synchronization of calendars between Google Calendar, Office 365, Exchange, and iCalendar. It is designed for businesses, teams, and individual users. Learn more.

How does AddSync work?

AddSync connects your calendar accounts and keeps them automatically synchronized. Updates made in one calendar appear in connected calendars instantly.

Which calendars can I sync with AddSync?

AddSync works with Google Calendar, Office 365, Exchange, and iCalendar, ensuring smooth synchronization across multiple platforms.

Does AddSync sync in real-time?

Yes. AddSync synchronizes events and updates in real-time or near real-time to prevent scheduling conflicts.

Can I sync multiple accounts at once?

Yes. AddSync supports unlimited calendar connections across multiple accounts, keeping all your calendars synchronized in one place.

What is the difference between one-way and two-way synchronization?

One-way sync updates only the target calendar from the source. Two-way sync updates all connected calendars when changes are made in any of them.

Can AddSync synchronize tasks and contacts?

Yes. Besides calendar events, AddSync can synchronize tasks and contacts, making time and team management more efficient.

Is AddSync secure?

Yes. AddSync uses advanced security measures and follows best practices to protect your data. See security details.

How do I start using AddSync?

Create an account on the AddSync website, connect your calendars, set synchronization rules, and AddSync will start syncing automatically.

Does AddSync offer a free trial?

Yes. AddSync offers a free trial (e.g., 14 days) to test all features before subscribing. Start free trial.

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