11 Best AI Assistants for Multiple Gmail Accounts (2026)
Short answer: Carly is the only assistant here that acts across every Gmail rather than just displaying them. Five of the others put four inboxes on one screen, which is a different job. Two charge you per inbox. Three hold one Google login at a time.
Gmail will let you stay signed into several accounts. That is not the same as one assistant that can search both, draft from the right one, and send from the address that received the thread. Gmail’s own answer used to be “Check mail from other accounts”, meaning POP fetch into one inbox, and Google is killing that path: after the first quarter of 2026 new users cannot turn it on, and existing users keep it only until January 2027.
We checked 11 assistants against two or more Gmail identities in August 2026, reading prices and account limits off the vendors’ own pages. Three things decide the ranking: how many Google logins one subscription holds, whether a second Gmail costs more, and whether a reply leaves from the mailbox that owns the thread.
Aliases (you+client@gmail.com) and Send mail as are not a second identity. They sit on one Google account. Workspace at work and @gmail.com at home are two OAuth grants.
The spread is about fourteen times, and it tracks one decision: whether extra Gmail identities are a feature or a meter.
1. Carly AI
Carly AI connects each Gmail or Google Workspace identity as its own authorized connection. The $35/month Personal plan includes unlimited connected emails and calendars. Adding the fourth Gmail does not change the price.
Carly is not a client you read mail in. Gmail stays Gmail. You ask for the account you want by name. A morning briefing comes back grouped by inbox. A search for renewal threads returns a source-account column. A draft lands in the mailbox that received the original message, and a send goes out from that identity.
That last point separates real multi-account handling from Gmail’s avatar menu. Plenty of clients let you sign into four Gmails. Far fewer reply from the correct one without you checking, and almost none do it while you are away from the app.
Connect it:
- Sign in at carlyassistant.com and open carlyassistant.com/integrations.
- Find Gmail, click Connect, and authorize the first Google account.
- Click Connect again, choose Use another account, and repeat for every other identity.
- To use the same accounts inside ChatGPT: open Plugins in the sidebar, click +, and paste
https://carlyassistant.com/mcp/. - To use them inside Claude or Cowork: open Customize → Connectors → Add custom connector, paste
https://carlyassistant.com/mcp/, authorize, then enable Carly from + → Connectors in the task.
That last step is the one people skip. Connecting your inboxes to Carly is half the job; pointing your assistant at Carly is what makes one chat reach all of them.
Best for: Anyone running two or more Gmail or Workspace accounts who wants one assistant acting across all of them
Key features:
- Unlimited connected emails and calendars on one subscription
- Account-aware routing, so replies and sends come from the address that owns the thread
- Cross-account search and briefings with the source account shown per row
- Works through email, SMS, Slack, or chat
- Reachable from Claude Cowork and ChatGPT through one connector
- 200+ integrations, so the same agent can touch calendar, CRM, and files
- Build separate agents per role, each with its own instructions and memory
Pricing: Free Zapier-style workflows; AI agents from $35/month
Limitations: Every account gets authorized individually, so four inboxes means four OAuth screens on day one, and a Google Workspace admin may need to approve access on managed accounts. Run read-only prompts against each inbox before you hand over sends.
Why it wins: adding a Gmail costs nothing, and the assistant still knows which Gmail it is acting in. Start here.
Clients that show every Gmail in one place
These five put several Gmail accounts into one interface, and that is where they stop. You are still reading, deciding, and replying.
2. Superhuman
A Seat is one person, and one Seat holds multiple Gmail and Workspace addresses, so you are not billed per inbox. What you get is tabbed account switching, not a combined list; the official guidance is still switch-and-work. Team features need separate Seats.
Pricing: Starter $25 and Business $33 per member/month, billed annually ($30 and $40 monthly)
Limitations: No true unified inbox, and it replaces Gmail’s interface across every account at once. See Superhuman alternatives.
3. Slashy
The Gmail-only client that does put multiple Gmail accounts in one unified inbox, with unlimited inboxes and automations on Professional. Outlook is still “coming soon.”
Pricing: Professional $25 per user/month billed annually, or $30 monthly
Limitations: Gmail and Google Workspace only, and it is a client rather than an agent that runs while you are away. See Slashy alternatives.
4. Shortwave
Strong email AI, Gmail only, multi-account on the free plan. Read the docs before calling it unified: Shortwave’s own multi-account page says there is “no default option to view a unified inbox,” and the suggested workaround is auto-forwarding secondary accounts into a primary Gmail plus Send mail as. Microsoft 365 and Exchange are “not supported at this time.”
Pricing: Free tier; Pro $18 per seat/month; Business $30; Premier $45; Max $120
Limitations: Forwarding is the documented merge path, which breaks reply identity. See Shortwave alternatives.
5. Spark Mail
Unlimited email accounts on every tier including free, a real unified inbox, and it will swallow a leftover IMAP address.
Pricing: Free tier; Plus $8.25 and Pro $16.58 per user/month billed annually
Limitations: The AI drafts and summarizes rather than running a multi-step task across your tools. See Spark alternatives.
6. Canary Mail
The budget answer. Unlimited mail accounts on the free plan, AI Copilot for $3 per month billed yearly.
Pricing: Free plan; Growth $3/month and Pro+ $10/month, billed yearly
Limitations: A desktop and mobile client, not a service that works while you are away. See Canary Mail alternatives.
Assistants that bill you by the Gmail
Both treat the second inbox as a billing event. Worth pricing against Carly at $35, where the fourth Gmail is free.
7. SaneBox
Plans are account tiers: Snack covers 1, Lunch 2, Dinner 4, at $9.49, $15.99 and $42.99 monthly in August 2026. Feature allowance is per account too. Four Gmails makes it the most expensive option in this ranking, though prepaying two years cuts Dinner to about $22 a month.
Limitations: It filters. It will not draft, schedule, or act. See SaneBox alternatives.
8. Fyxer
Starter connects exactly one inbox and one calendar. Multiple Gmails require Professional, moving the price from $30 to $50 per user/month monthly, or $22.50 to $37.50 annually. It also states plainly that it cannot send on your behalf.
Limitations: A two-thirds price increase for a second Google address, and it never sends. See Fyxer alternatives.
Inbox Zero has the same shape smaller: Starter is $20 per user/month with no advertised second account, and Plus is $35 for exactly two.
Assistants locked to one Gmail at a time
All three reach every connected inbox through Carly’s remote connector at https://carlyassistant.com/mcp/, which is how people get round this without leaving the assistant they already use.
9. Gemini in Gmail
Tied to whichever Google account you are signed into. Switching the avatar switches the assistant’s entire context, so there is no cross-account search and no unified briefing.
Pricing: Included with Google Workspace Business tiers and consumer Google AI plans
10. ChatGPT
The Gmail app authorizes one Google identity. OpenAI’s Google app FAQ says it can access content from “the Google account you choose to connect,” and connecting a second Gmail replaces the first. Account switching keeps two ChatGPT logins signed in; their connected apps stay separate. The multiple Gmail accounts in ChatGPT guide has the plugin setup.
Pricing: Plus from $20/month; Work and workspace plans priced separately
11. Claude
Claude’s Google Workspace connector reaches Gmail, Calendar, and Drive “for the Google account you’ve connected.” A second Gmail is a reconnect, not an add. See multiple Gmail accounts in Claude Cowork.
Pricing: Cowork is included with Pro and Max; not on the free plan
Quick comparison
| Tool | Gmails per subscription | One list, or tabs? | Sends from the right address | Price |
|---|---|---|---|---|
| Carly AI | Unlimited | One assistant, accounts stay separate | Yes, routed | From $35/mo |
| Superhuman | Multiple, one Seat | Tabs, not a unified inbox | Yes, inside the client | $25–$33/member/mo annual |
| Slashy | Unlimited Gmail | Unified inbox | Yes, inside the client | $25/user/mo annual |
| Shortwave | Multiple Gmail | Tabs; unify only by forwarding | Yes, on the signed-in Gmail | Free–$120/seat/mo |
| Spark Mail | Unlimited | Unified inbox | Yes, inside the client | Free–$16.58/user/mo annual |
| Canary Mail | Unlimited | Unified inbox | Yes, inside the client | Free–$10/mo yearly |
| SaneBox | 1, 2, or 4 by plan | N/A, it filters | N/A | $9.49–$42.99/mo |
| Fyxer | 1 on Starter, multiple on Professional | Multiple on Professional | Drafts only | $22.50–$37.50/user/mo annual |
| Gemini in Gmail | One account | Avatar switch | Inside that account | Included with Google plans |
| ChatGPT | One Google identity | Separate ChatGPT logins | That identity only | From $20/mo |
| Claude | One Google identity | Reconnect to switch | Sends on Gmail with approval | Pro / Max |
How to pick
If you want the assistant to do the work rather than prepare it, Carly. Connect the Gmails, add Carly to whichever assistant you already use, and ask.
If you want one list of every Gmail, Slashy, Spark, or Canary. Superhuman and Shortwave make you switch tabs.
If cost is the binding constraint, Canary at $3/month or Spark’s free tier hold every Gmail you own. You give up autonomy, not coverage.
If you live in ChatGPT or Claude already, the native Gmail connector will not hold both accounts. Add Carly at https://carlyassistant.com/mcp/ and keep the assistant you have.
Do not wait out Gmail’s POP fetch, and do not forward Workspace into personal Gmail to fake a merge. Connect each identity separately.
FAQ
What is the best AI assistant for multiple Gmail accounts?
Carly AI. Unlimited connected emails and calendars are included at $35/month, and it routes every action back to the account that owns the thread. For a faster client with a real unified inbox, Slashy or Spark.
Can Gemini handle two Gmail accounts at once?
No. Gemini is tied to the Google account you are signed into. Switching accounts switches the assistant.
Does Shortwave have a unified inbox for multiple Gmails?
Not natively. Shortwave’s docs say there is no default unified inbox. The documented merge is forwarding plus Send mail as.
Do AI email assistants charge per Gmail account?
Some do. SaneBox sells plans by account count. Fyxer restricts Starter to a single inbox. Inbox Zero includes a second account only on Plus. Carly, Spark, Canary, Shortwave, Slashy, and Superhuman include every Gmail you connect at no extra per-inbox fee.
Can ChatGPT or Claude see two Gmails in one chat?
Not natively. Each connector authorizes a single Google identity. Add Carly as a plugin in ChatGPT or a custom connector in Claude, both at https://carlyassistant.com/mcp/, and every Gmail Carly holds becomes reachable from one chat.
How many Gmail accounts can Carly connect?
Unlimited emails and calendars are included on the $35/month plan. Each account is authorized separately on the integrations page, then referred to by a role you assign.
Related: Multiple Gmail accounts in ChatGPT · Multiple Gmail accounts in Claude Cowork · Best AI assistants for multiple email accounts · Manage multiple email accounts with AI · Best AI personal assistants · Can Claude connect to multiple Gmail accounts? · Can ChatGPT connect to multiple Gmail accounts?
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