What is the best tool to sync Google Calendar and Outlook?

For real-time two-way sync, dedicated services like LeapSync, OneCal, and CalendarBridge lead. LeapSync stands out for flat pricing, a private Apple feed, and not storing event content. The best choice depends on whether you also need scheduling links, native mobile apps, or a free option.

Is there a free way to sync Google and Outlook calendars?

Yes, but with trade-offs: the native ICS subscription is free and one-way with 12–48 hour delays, and the open-source OGCS app is free two-way but only runs while your Windows PC is on. Real-time always-on sync requires a paid service.

Which calendar sync tools survive Microsoft's 2026 EWS retirement?

Tools built on Microsoft Graph rather than Exchange Web Services. LeapSync is Graph-native. Confirm with any other vendor that they've migrated off EWS before October 2026.

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Best calendar sync tools for Google and Outlook (2026)

Updated 2 June 2026 · LeapSync team

Four calendar sync tools compared with one highlighted in green — the best calendar sync tools, ranked

Short answer: For real-time, two-way sync between Google Calendar and Outlook, the strongest dedicated options in 2026 are LeapSync, OneCal, and CalendarBridge. If you only need one-way and want it free, the native ICS subscription or the open-source OGCS desktop app work but are slower. Below is an honest comparison so you can match a tool to what you actually need.

At a glance

Tool	Direction	Speed	Best for
LeapSync	Two-way	~5s	Real-time Google ↔ Outlook + private Apple feed, privacy-first, flat pricing
OneCal	Two-way	Fast	Sync bundled with scheduling/booking links
CalendarBridge	Two-way	Real-time	Native mobile apps, HIPAA BAA
OGCS (open-source)	Two-way	On a timer	Free, but Windows desktop must be running
Zapier / Power Automate	Configurable	1–15 min	Wiring sync into other automations
Native ICS subscribe	One-way	12–48 hr	Free read-only view, no real edits

Compiled 2 June 2026. Verify current pricing and features with each vendor before deciding.

1. LeapSync — real-time two-way, privacy-first

LeapSync focuses on doing one thing well: keeping Google Calendar and Microsoft 365 / Outlook in sync both ways, in real time, with a private read-only Apple/ICS feed for your iPhone. It runs on the web (no install), is built on Microsoft Graph (so it survives the 2026 EWS retirement), and is designed not to store your event titles or attendees. Flat pricing from $4/month with a 14-day free trial.

2. OneCal — sync plus scheduling

A polished tool that pairs multi-calendar sync with booking links and meeting scheduling. Priced per user. A good fit if you want a scheduling suite, not just sync.

3. CalendarBridge — mobile apps and HIPAA

Offers native iOS/Android apps and HIPAA BAAs on higher tiers. Uses connection-based pricing, which can climb as you add calendars. Strong if a native app or signed BAA is a must.

4. OGCS (Outlook Google Calendar Sync) — free and open-source

A free, open-source Windows desktop app. It can sync two-way, but only while your PC is running and on the schedule you set — there's no always-on cloud component. Great for tinkerers on a budget.

5. Zapier / Power Automate — automation glue

General automation platforms can move events between calendars. They poll on an interval, can stumble on recurring events, and cost scales with usage, but they shine when sync is one step in a larger workflow.

How to choose

Need real-time, always-on, two-way sync? A dedicated cloud tool (LeapSync, OneCal, CalendarBridge).
Care most about privacy and predictable price? LeapSync.
Only need a free read-only view? Native ICS subscription.
Want it free and don't mind a desktop running? OGCS.

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Frequently asked questions

What is the best tool to sync Google Calendar and Outlook?: For real-time two-way sync, dedicated services like LeapSync, OneCal, and CalendarBridge lead. LeapSync stands out for flat pricing, a private Apple feed, and not storing event content. The best choice depends on whether you also need scheduling links, native mobile apps, or a free option.
Is there a free way to sync Google and Outlook calendars?: Yes, but with trade-offs: the native ICS subscription is free and one-way with 12–48 hour delays, and the open-source OGCS app is free two-way but only runs while your Windows PC is on. Real-time always-on sync requires a paid service.
Which calendar sync tools survive Microsoft's 2026 EWS retirement?: Tools built on Microsoft Graph rather than Exchange Web Services. LeapSync is Graph-native. Confirm with any other vendor that they've migrated off EWS before October 2026.