Short answer: if you have a Gmail account and an Outlook account, skip the built-in assistants. Gemini works only in Gmail, and Copilot works only in Outlook. Jace, Fyxer and Superhuman's Email Assistant all work inside both, and Spark is an email app that holds both in one place. Jace covers 2 inboxes on its Plus plan ($20 a month billed yearly) and 8 on Pro. It supports Gmail and Google Workspace, Microsoft 365 and personal Outlook.com, Hotmail and Live accounts. It labels each inbox, drafts replies into each account's own Drafts folder and uses one credit allowance across them.
Facts about other tools come from their own sites, opened on 9 November 2026 and linked at the end. Jace facts come from Jace's docs and pricing page. We make Jace.
Which AI email assistants support Gmail and Outlook
| Tool | Gmail and Google Workspace | Outlook (Microsoft 365) | Outlook.com, Hotmail, Live | Several inboxes on one plan | Price, billed yearly |
|---|---|---|---|---|---|
| Jace | Yes | Yes | Yes | Plus 2, Pro 8 per user | $20 per user per month |
| Fyxer | Yes | Yes | Not stated on its pricing page | Yes. Fyxer says a person who links Gmail and Outlook is still one seat | $37 per person per month |
| Superhuman Email Assistant | Yes | Yes | Not stated | Yes, several Gmail and Outlook accounts, per Superhuman's FAQ | $12 per member per month |
| Spark (email app) | Yes | Yes | Yes | Yes, as an email client for many accounts | See Spark's pricing |
| Gemini in Gmail | Yes | No | No | Gmail only | Included in Google Workspace plans |
| Copilot in Outlook | No | Yes | See Microsoft's consumer plans | Outlook only | Microsoft 365 Copilot Business from $18 per user per month |
| Shortwave | Yes | No. Shortwave doesn't support Microsoft 365 | Only by forwarding | Gmail only (see our Shortwave comparison) | Pro $18 per seat per month, billed monthly |
Price detail for all of these is in how much an AI email assistant costs.
Why people end up with both
The most common case is a work Outlook account on Microsoft 365 and a personal or side-business Gmail. Many consultants have the reverse: their own Google Workspace plus a client-issued Outlook mailbox.
An assistant that works with only one of them leaves half your mail unsorted. Running two different assistants means two sets of rules, two writing styles to train and two bills.
How Jace handles Gmail and Outlook together
One login, several inboxes. In Jace, open the account menu, choose Add another account and sign in with Google or Microsoft. The new inbox joins your plan at no extra charge, up to 2 on Plus and 8 on Pro. Inviting a teammate is different and adds a paid seat (multiple accounts).
Each inbox keeps its own setup. Labels and settings are per inbox, so your client Outlook can have different labels and drafting rules from your personal Gmail. In Gmail, Jace labels look like normal labels. In Outlook, they show as categories (Labels).
Drafts land where the email lives. A reply to a Gmail thread goes into that Gmail account's Drafts folder, and an Outlook reply into the Outlook Drafts folder. You can send from either provider's own app, including on your phone. Jace uses the right signature and send-as address for each account (Signature and send-as).
One credit pool. All inboxes under your login share your monthly credits. Plus includes 10,000 credits a month. A second busy inbox with auto-drafts on uses roughly twice the credits, so turn auto-drafts on only for the labels you need (credits).
Not supported: IMAP providers such as Yahoo or iCloud, and on-premises Exchange. Jace works with Google's and Microsoft's cloud mail only. Setup guides: Jace for Gmail and Jace for Outlook.
Which tool fits your mix
A work Outlook plus a personal Gmail, and you answer most mail yourself: Jace or Superhuman's Email Assistant. Jace adds Flows, integrations such as Slack and HubSpot, and opt-in auto-send. Superhuman costs less.
Both accounts, and lots of meetings: Fyxer, which adds a meeting notetaker.
You want one app to read everything, including iCloud or Yahoo: an email client such as Spark, which supports IMAP and Exchange as well as Gmail and Outlook.
Gmail only: Gemini or Shortwave are options. Outlook only: Copilot, if your company licenses it.
Jace fits professionals who answer their own client email across both providers, such as lawyers and consultants. For a wider comparison, read the best AI email assistants in 2026.
FAQ
Is there an AI email assistant that works with both Gmail and Outlook? Yes. Jace, Fyxer and Superhuman's Email Assistant work inside both Gmail and Outlook. Gemini works only in Gmail and Copilot only in Outlook.
Can I connect a Gmail and an Outlook account to the same Jace plan? Yes. Jace Plus connects up to 2 inboxes under one login and Pro up to 8, at no extra charge. Each one signs in with Google or Microsoft.
Does Jace work with Outlook.com and Hotmail? Yes. Jace supports Outlook on Microsoft 365 and personal Outlook.com, Hotmail and Live accounts. It doesn't support on-premises Exchange or IMAP.
Do the inboxes share settings? No. Each connected inbox has its own labels and settings, so auto-drafts run separately in each. They share one credit allowance.
Where do Jace's drafts appear? In the Drafts folder of the account the email came to, so you can send from Gmail, Outlook or their phone apps.
How much does Jace cost for two inboxes? Plus covers 2 inboxes for $20 a month billed yearly or $25 monthly. Pro covers 8 for $40 a month billed yearly or $50 monthly. Both start with a 7-day free trial.
Try Jace on both accounts
Connect your Gmail and your Outlook during the 7-day trial and compare the drafts in each, with auto-send off. Start your free Jace trial, or compare Jace's plans first.
Sources (checked 9 November 2026)
- Jace: multiple accounts, Labels, Signature and send-as, credits, pricing
- Fyxer: pricing and FAQ
- Superhuman: Email Assistant, plans
- Spark: sparkmailapp.com
- Google: Collaborate with Gemini in Gmail
- Microsoft: Frequently asked questions about Copilot in Outlook, Microsoft 365 Copilot pricing
- Shortwave: pricing
