11 Best AI Assistants for Multiple Calendars (2026)
“Multiple calendars” is three different problems that get sold as one.
A single Google login can hold a primary calendar, a team calendar, a family calendar, and a few subscriptions. Overlaying those is free and built in. Two Google identities — work Workspace and personal Gmail — are a different problem. Work Outlook plus personal Google is a third.
Most AI calendar tools solve the first. The people who actually pay for help are usually in the second or third: one person, two accounts, and a coworker who keeps booking over the dentist.
We checked 11 tools against that setup. Prices and calendar limits below were read off vendor pages in August 2026. Two of the answers are free on carlyassistant.com and do not require the $35 agent plan: a combined calendar viewer, and Calendar Sync.
The three questions that decide it
Can it see more than one identity? Secondary calendars under one login are easy. A second Google account, or Outlook next to Google, is the actual test.
Do you need a view, a copy, or an assistant? A combined viewer shows every calendar in one window so you can add and edit. A busy-block sync writes availability onto the calendar other people look at. An assistant checks every calendar and then creates the event on the one you name.
What leaks? Sharing a personal calendar into a work tenant can put private titles in front of an admin. A one-way copy that rewrites the title to “Busy” does not.
The $0 row is a view or a one-way copy. The $35 row is an assistant that also does email. Those are different jobs. Pick by the job, not by the bar.
Two free Carly tools, then the agent
Carly ships the two things most “multiple calendars” searches actually want, without the agent plan.
Combined calendar view. Sign in at carlyassistant.com, connect Google Calendar and Outlook accounts, and every calendar lands in one viewer. Add events, edit them, and work it like a normal calendar — except work Google, personal Google, and Outlook are in the same week. The free plan lists this as a full multi-calendar view across Microsoft and Google. You are looking at the real calendars, not a share or an ICS overlay, so a new event goes on the calendar you pick.
Calendar Sync. A free one-way mirror. Pick a source and a destination. New, edited, and deleted events propagate. Per event you can keep the title, rewrite it to “Busy,” or use a template, then strip attendees and blank the description. Google to Google, Outlook to Outlook, and Google to Outlook. No signup required to try it.
The viewer is for you. Sync is for everyone else. If coworkers book you on the work calendar, they never open Carly — they need a Busy block on the calendar they already have. If you just need one window over every login, the viewer is enough and you can stop there.
1. Carly AI
The $35/month Personal plan is the agent layer on top of those same connections. Unlimited connected emails and calendars, Google and Microsoft. A briefing can list today’s events with the source account and calendar name. A conflict check can run across work Google, personal Google, and Outlook at the same time. A new hold is created on the calendar you name, not whichever one the tool happens to be anchored to.
That is the difference from a viewer or a sync. The viewer shows every calendar. Sync copies availability onto another calendar so other people stop booking you. The agent uses every calendar as input, then writes to one of them on purpose — and can also read the email that started the meeting, send the reply, and update a CRM. Nobody on the other end needs a booking link.
Best for: One person whose calendars live on more than one account, and who wants the assistant to schedule rather than only show or block time
Key features:
- Free combined calendar view across Google and Outlook
- Free one-way Calendar Sync with rewrite rules
- Unlimited connected calendars on the $35 agent plan
- Availability across every connected calendar before a time is proposed
- Events stay on the original calendar; writes go to the account you name
- Works through email, SMS, Slack, or chat
- Reachable from Claude Cowork and ChatGPT Work through a remote connector
Pricing: Combined calendar view and Calendar Sync are free. Free Zapier-style workflows; AI agents from $35/month
Limitations: Each account is authorized separately. A Workspace or Entra admin may need to approve access. Require the full address and calendar name before any create, move, or delete. The free viewer does not put Busy blocks on a coworker’s calendar — that is Calendar Sync.
2. Reclaim.ai
Reclaim is the strongest dedicated calendar AI for this job. It connects Google and Outlook, defends focus time, and syncs events so personal commitments show as busy on the work calendar. Lite is free: 2 connected calendars and 1 calendar sync. Starter is $10 per seat/month yearly with unlimited connected calendars and 3 syncs. Business is $15 per seat/month yearly with unlimited syncs.
Best for: Protecting focus time and keeping two calendars from double-booking
Key features:
- Focus time, habits, buffers, and smart meetings
- Calendar sync across Google and Outlook
- Scheduling links that respect protected time
- Slack and task-app integrations
Pricing: Free Lite; Starter $10/seat/month yearly; Business $15/seat/month yearly
Limitations: A calendar product. It will not draft the email that set up the meeting. Lite’s single sync covers one personal-to-work busy block. See Reclaim alternatives.
Sync tools that are not assistants
The viewer above is for you. These write onto a destination calendar so other people see the time.
3. Calendar Sync
Calendar Sync is the free one-way mirror on the same Carly account as the combined view. Pick a source calendar and a destination. New, edited, and deleted events propagate. Per event you can keep the title, rewrite it to “Busy,” or use a template, then strip attendees, blank the description or location, and set the copy as Busy, Free, or Tentative. Conditions can match visibility, attendee count, day, duration, organizer, and more. The source is never changed.
Google to Google, Outlook to Outlook, and Google to Outlook all work. No signup required to try it.
Best for: A sanitized busy block from personal onto work, for free
Limitations: One-way by design. It does not propose times or send email. It does not replace the combined viewer — you still open Carly (or Google, or Outlook) to see the full picture.
4. CalendarBridge
CalendarBridge is the paid two-way option. It syncs Google, Microsoft 365, personal Microsoft, and iCloud. You control whether the destination gets full details or just “Busy.” Basic is $5/month or $4/month yearly for 2 calendars. Premium is $10/month or $8/month yearly for 5. Pro is $40/month or $32/month yearly for 8.
Best for: True two-way sync, including deletions both directions
Limitations: Priced by calendar count. The AI scheduling assistant is an extra layer on top of sync, not a general agent. See CalendarBridge alternatives.
Calendar clients with more than one account
5. Vimcal
Vimcal is a keyboard-first calendar client. Multiple Google Calendar accounts sit in one view, with Outlook supported as well. AI is natural-language create, time-zone help, and meeting-prep summaries.
Best for: People who live in the calendar all day and want one window
Pricing: From $15/month
Limitations: Replaces the Google Calendar UI. See Vimcal alternatives.
6. Notion Calendar
Notion Calendar is a free Google Calendar client with multi-account support and a Notion database hook.
Best for: Seeing several Google calendars without paying
Pricing: Free
Limitations: Thin AI. Mail is still in Gmail. See Notion Calendar alternatives.
7. Motion
Motion auto-schedules tasks into open calendar slots and rearranges when meetings move. Individual is $19/month; teams are $12/user/month.
Best for: A calendar that also plans the to-do list
Pricing: $19/month individual; $12/user/month team
Limitations: You have to put the work into Motion to get the value. See Motion alternatives.
8. OneCal
OneCal is a dedicated calendar sync: Google, Outlook, and iCloud, with a unified view and privacy controls on what the destination gets. Starter covers 2 calendars at $5 per user/month billed yearly. Essential is 5 calendars at $10. Premium is 50 calendars at $25.
Best for: Two or more calendars that need a paid, real-time copy rather than a one-way free mirror
Pricing: Starter $5, Essential $10, and Premium $25 per user/month billed yearly
Limitations: A sync product with scheduling links, not an assistant that sends the email.
Assistants locked to one calendar identity
9. ChatGPT
ChatGPT’s Google Calendar app connects one Google account. OpenAI does not document a second-account flow, and it does not say whether secondary calendars are searched. Meeting creation on Google is a workspace write action that an admin has to enable. On Outlook, your own calendar is read-only; shared calendars can be written. See ChatGPT Work and calendar.
Pricing: Plus from $20/month
Limitations: One Google identity. Secondary-calendar support is undocumented.
10. Claude
Claude’s Google connector can view events “including shared calendars you have access to” and can create, update, and delete events on the connected account. A second Google login replaces the first. Microsoft 365 calendar writes exist on that connector and need a live conversation.
Pricing: Cowork included with Pro and Max
Limitations: One Google identity. Shared calendars under that identity yes; a second login no.
11. Microsoft Copilot
Copilot sees the Microsoft 365 tenant that licenses it. A personal Google calendar, a second company’s Outlook, or a Gmail calendar are all invisible.
Pricing: $30 per user/month on top of Microsoft 365
Limitations: One tenant. The whole work-and-personal problem is left unsolved.
Quick comparison
| Tool | Identities | Google + Outlook | What it does | Price |
|---|---|---|---|---|
| Carly calendar view | Unlimited | Yes | Combined viewer; add and edit like a normal calendar | Free |
| Calendar Sync | Two calendars per rule | Yes | One-way mirror with rewrite rules | Free |
| Carly AI | Unlimited | Yes | Checks every calendar, books on the one you name | From $35/mo |
| Reclaim | 2 on Lite, more on paid | Yes | Focus time + busy-block sync | Free–$15/seat/mo yearly |
| CalendarBridge | 2 / 5 / 8 by plan | Yes, plus iCloud | One-way or two-way sync | $4–$32/mo yearly |
| Vimcal | Multiple | Yes | Faster calendar client | From $15/mo |
| Notion Calendar | Multiple | Google-first | Free multi-account view | Free |
| Motion | Connected calendars | Yes | Auto-schedules tasks onto the calendar | $19/mo |
| OneCal | 2 / 5 / 50 by plan | Yes, plus iCloud | Real-time sync + unified view | $5–$25/user/mo yearly |
| ChatGPT | One Google identity | Separate apps | Read; writes gated by plan | From $20/mo |
| Claude | One Google identity | Separate M365 connector | Read/write on the connected account | Pro / Max |
| Microsoft Copilot | One tenant | No | Drafts inside Microsoft | $30/user/mo |
How to pick
If you just want one window over every calendar, use the free combined view on carlyassistant.com. Connect Google and Outlook, then add and edit in one place. Notion Calendar is the Google-only version of that idea. Vimcal is the paid power-user client.
If other people book over your personal life, start with Calendar Sync. One-way, title rewritten to “Busy,” personal details left behind. That is the job how to auto-copy Google Calendar events is about, and it is free. The viewer does not fix this, because coworkers never open it.
If you also want focus time and habit blocking, Reclaim. Pay for Starter once one sync is not enough.
If you want the assistant to find the time and send the email, Carly agents from $35/month. The free viewer and the free sync will not do that.
If you live in ChatGPT or Claude, do not expect the native calendar connector to hold both identities. Connect Carly, or keep switching.
FAQ
What is the best AI assistant for multiple calendars?
If you want one window over every Google and Outlook calendar, the free combined view on carlyassistant.com is the place to start. If coworkers need to see you as busy without seeing the title, use free Calendar Sync. If you want the assistant to find the time and send the email, Carly agents start at $35/month, with unlimited connected calendars on that plan.
Can Google Calendar show work and personal in one view?
Yes, if you share or subscribe one calendar into the other. That is an overlay, not a copy, and it can put personal titles in front of a work admin. Carly’s free combined view shows both identities without sharing the personal calendar into the work tenant. A one-way busy-block sync is what you add when coworkers book on the work calendar.
Is Carly’s calendar view the same as Calendar Sync?
No. The view is for you: every connected calendar in one window, add and edit like a normal calendar. Sync writes a copy onto a destination calendar so other people, and other tools, see you as busy. Most people with work and personal calendars want both.
Is overlay the same as sync?
No. Overlay is a view. Sync writes events onto the destination calendar so other people, and other tools, see you as busy. Edits and deletes only stay honest if the tool watches for them. Calendar Sync and CalendarBridge do. A Zap that only fires on “new event” does not.
Can ChatGPT or Claude check two calendars at once?
Not natively, if those calendars belong to two different logins. Shared calendars under the connected identity are a maybe on ChatGPT (undocumented) and a yes on Claude. Two Google accounts require Carly or two separate sessions.
Related: Best AI assistants for Google Calendar · How to auto-copy Google Calendar events · How to manage multiple Google Calendars · How to sync Google Calendar with Outlook
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
