Best Outlook to Google Calendar Sync Tools in 2026 (Compared)
Eight realistic options for getting Outlook events into Google Calendar, compared on the axes that actually differ: direction, speed, platform requirements, whether your work calendar gets written to, and price. Prices checked on vendor sites in July 2026.
Short answer
For pure one-way Outlook → Google sync, Calendar Syncer is the most direct tool: minute-level updates, no write access to your work calendar, $9/month. For two-way sync across many calendars, OneCal and CalendarBridge lead. For free, use Google’s URL subscription (12–24h delay) or OGCS on an always-on Windows PC.
The comparison table
| Tool | Direction | Update speed | Writes to work calendar? | Runs where | Price |
|---|---|---|---|---|---|
| Calendar Syncer | One-way only (Outlook → Google) | ~1 minute | Never | Cloud | $9/mo flat, 14-day trial (no card) |
| Google URL subscription | One-way view | 12–24+ hours | Never | Built-in | Free |
| OGCS | One-way or two-way | Minutes, while PC is on | Optional | Windows desktop | Free (donationware) |
| OneCal | One-way & multi-way | Near real-time | In two-way mode | Cloud | From $5/mo (annual), no free plan |
| CalendarBridge | One-way or two-way | ~1 minute | In two-way mode | Cloud | From $4/mo (annual) |
| Reclaim.ai | Two-way + AI scheduling | Near real-time | Yes | Cloud | Free: 1 sync; from $10/seat/mo (monthly billing) |
| Zapier | One-way per zap | Minutes | Only if you build it | Cloud | Free tier; usage-based |
| SyncGene / CiraHub | One-way or two-way | Varies; free tier is manual | In two-way mode | Cloud | Free: 1 manual sync/month; paid via CiraHub |
1. Calendar Syncer — best for one-way Outlook → Google
Calendar Syncer does exactly one job: it mirrors your Outlook calendar into Google Calendar continuously, with changes arriving in about a minute via Microsoft’s change notifications, and it never writes to the Outlook side. That scope is the point — no write access to a work calendar to explain to IT, no duplicate loops, synced events in a separate app-created Google calendar, encrypted tokens and event data. $9/month after a 14-day trial, up to three Outlook calendars. If you need two-way sync, iCloud support, or scheduling links, pick a tool below instead — this one deliberately does none of that.
2. Google’s URL subscription — best free option
Built into both products, free forever, and fine whenever a day of lag doesn’t hurt. Its two structural limits: the 12–24 hour refresh cycle with no manual override, and work tenants that disable publishing altogether. Setup steps are in the full guide.
3. OGCS — best free option for classic Outlook on Windows
Outlook Google Calendar Sync is a beloved open-source desktop tool: flexible directions, attribute-level control, zero cost. It syncs only while its Windows PC is awake, has no Mac or mobile story, and its classic-Outlook heritage meets a shrinking host: the new Outlook doesn’t run classic COM add-ins. Great for tinkerers with a desktop that never sleeps.
4. OneCal — best all-round two-way sync
OneCal syncs Google, Outlook, and iCloud in one-way or multi-way configurations with polished controls (busy-only cloning, color rules, scheduling links). From $5/user/month billed annually; no free plan. If you manage several calendars across providers and want them all merged, this is the mainstream choice.
5. CalendarBridge — best for many accounts and compliance needs
CalendarBridge advertises sync “typically within one minute”, one-way and two-way modes, and a HIPAA-ready tier — from $4/month billed annually for two calendars. A solid pick for consultants juggling multiple client tenants who need real-time merged availability.
6. Reclaim.ai — best if you want AI scheduling with your sync
Reclaim (now part of Dropbox) bundles two-way calendar sync with AI-driven scheduling — habits, focus time, smart meeting placement. The free plan includes exactly one sync policy between two calendars; paid plans start at $10/seat/month. Overkill if you only need your Outlook meetings visible in Google.
7. Zapier — best for custom automation logic
Zapier copies new Outlook events to Google within minutes, and can filter, transform, and route them arbitrarily. But edits, cancellations, and deletions are not handled by a basic zap — each needs additional automation, and the whole setup consumes task quota. Choose it when you need logic, not fidelity.
8. SyncGene / CiraHub — legacy option in transition
SyncGene pioneered multi-source sync (calendars, contacts, tasks), but its free tier now allows one manual sync per month and the product is being folded into CiraHub, its business-oriented successor. Existing users should evaluate the migration; new users are better served by the tools above.
How to choose in 30 seconds
- Work Outlook → personal Google, nothing written back: Calendar Syncer.
- Free and a day of delay is fine:Google’s URL subscription.
- Free, Windows desktop always on, classic Outlook: OGCS.
- True two-way across several accounts: OneCal or CalendarBridge.
- Sync plus AI scheduling: Reclaim.
Unsure about direction? Read one-way vs two-way sync first — it is the decision the rest follows from.
Frequently asked questions
What is the best free way to sync Outlook Calendar with Google Calendar?
Google Calendar's built-in URL subscription: publish the Outlook calendar as an ICS link and add it in Google under Other calendars → From URL. It costs nothing and updates continuously — just slowly, roughly every 12–24 hours, with no manual refresh.
What is the best tool if I only need Outlook-to-Google (one direction)?
Calendar Syncer is built solely for that direction: changes land in about a minute, nothing is ever written to the Outlook side, and it costs $9/month flat after a 14-day trial. Two-way tools also handle one-way modes but carry write access you don't need.
What is the best two-way calendar sync tool in 2026?
OneCal and CalendarBridge are the established choices — both sync Google, Outlook, and more in real time with per-calendar direction controls, from about $4–5 per month. Reclaim is strong if you also want AI scheduling on top of sync.
Is OGCS still a good option in 2026?
For classic-Outlook users on an always-on Windows PC, yes — it is free, open source, and configurable. Its constraints are the machine (must be on to sync, Windows only) and Microsoft's retirement of classic Outlook as the default, which is shrinking the setup it was built around.
Do any of these tools write to my work Outlook calendar?
Two-way tools do by design — that is what write-back means. The free ICS subscription, a one-time export, and one-way services like Calendar Syncer never modify the Outlook calendar.