Pick a Canary Mail alternative by how you work in email each day. If you juggle several accounts on one computer, a desktop client that brings them together is the closest swap. If you work as a team, a shared inbox fits better, and if you want help writing and sorting mail, look at the AI-led apps.
Is your inbox a place you read alone, or a place your team works in together? That one question splits this list in half before you've looked at a single feature. Canary Mail pitches itself as a way to bring all your accounts into one inbox, and some of the apps below do much the same, while others take email somewhere quite different. Here are eight to consider, in no particular order.
The eight email apps, A to Z
Alphabetical, unranked, and described from what each vendor says about its own app.
HEY
Best for: Anyone who wants a fresh take on email away from the big providers, which the vendor frames as its whole reason to exist; a calendar now sits alongside it.
Mailbird
Best for: Windows and Mac users pulling Gmail, Outlook, Exchange and IMAP accounts into one desktop workspace; a free plan is named on the vendor's site.
Mimestream
Best for: Mac users whose mail lives in Gmail and who'd rather use a native desktop app than a browser tab, as the vendor describes it.
Missive
Best for: Teams that run on email and need to see who's handling what, with private discussion beside each message, according to the vendor.
Polymail
Best for: Founders and operators who close deals by email and want tracking, follow-ups and meeting scheduling built into the inbox, per the vendor's homepage.
Shortwave
Best for: People who'd like an AI agent to organise, draft, search and schedule from a typed prompt; the vendor names a free plan.
Spark
Best for: Busy inboxes that need the important messages surfaced and the rest cleared quickly, which is the vendor's main promise.
Superhuman
Best for: Professionals who want AI help that follows them across the places they work, with the vendor now framing email as one part of a wider suite.
Canary Mail alternatives in one table
| Tool | Kind of app | Good for |
|---|---|---|
| HEY | Independent email service | People ready to rethink how email works |
| Mailbird | Desktop email client | Several accounts on one Windows or Mac computer |
| Mimestream | Native Mac app for Gmail | People who prefer a desktop app to a browser tab |
| Missive | Team inbox | Teams sharing and discussing email together |
| Polymail | Deal-focused inbox | Tracking, follow-ups and scheduling inside email |
| Shortwave | AI email assistant | Sorting, writing and searching mail with prompts |
| Spark | Focused email app | Seeing important mail first and clearing the rest |
| Superhuman | AI productivity suite | Fast-moving professionals working across many apps |
Three ways to run an inbox
One window for every account
These keep the familiar idea of an email client: your accounts, your folders, your messages, with less clutter. Mailbird is the broadest on account types and runs on Windows as well as Mac. Mimestream stays narrow on purpose, as a Mac app for Gmail only. Spark's focus is on surfacing what matters and clearing the rest fast. If you liked having one tidy window for everything, start here.
Email as teamwork
Some apps treat email as shared work rather than private reading. Missive lets teammates see who's on a message and talk about it out of the customer's sight. Polymail leans towards founders and dealmakers, folding tracking, follow-ups and scheduling into the inbox. If more than one person touches the same conversations, these will feel more natural than a personal client.
A different idea of what email is
The last group asks you to change habits, not just apps. HEY is its own take on email, built as a reaction against the big providers. Shortwave puts an AI agent at the centre, so you type what you want done. Superhuman now presents itself as a wider AI suite with email as one part. They reward people who are happy to learn a new routine, and they're worth a slower trial than a straight client swap.
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Test it against a normal working day
The useful test for any replacement is how it changes your daily inbox routine, and which mail accounts and devices it supports. A good-looking app is no use if it can't see your work account, or if it runs on your laptop but not your phone.
So before you commit, list every account you check, every device you check it on, and the three or four things you do most: clearing new mail, finding an old thread, replying from your phone, sharing a message with a colleague. Then run a real working day through each app on your shortlist. Note where you reach for your old tool out of habit, because that's where the new one is slowing you down.
Advice before you move your inbox
Don't switch on a busy week. Give yourself a quiet few days, keep your old app installed but closed, and move your signatures, filters and templates first, since those take the longest to rebuild. If your team shares mail, agree who owns which conversations before you move, or messages will slip between two tools.
For more options by device, see my guides to the best email client for Mac and email clients for Windows, and if your team shares an address, my list of shared inbox software.
A one-week switch plan
- Day one: list every account, device and signature you use today.
- Day two: install the leading app on your shortlist on your main computer and connect one account only.
- Days three and four: add the rest of your accounts and your phone, then rebuild filters and templates.
- Day five: run a full working day in the new app without opening the old one.
- End of the week: keep it if nothing slipped, or try your second choice the same way.
Do you make email apps or inbox tools? Tool makers can ask to be considered for a featured place on this list.
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Frequently asked questions
Can one email app handle Gmail, Outlook and other accounts together?
Many can. Desktop clients often connect Gmail, Outlook, Exchange and standard IMAP accounts in one window. Check that every account type you use is supported before you move.
What's the difference between an email client and a shared inbox?
An email client is built for one person reading their own mail. A shared inbox lets a team see, assign and discuss the same messages without forwarding them around.
Do AI email apps read my messages?
To sort, summarise or draft, an AI feature has to process your mail. Read each vendor's privacy terms, and check your company's policy before connecting a work account.
Will I lose my old emails if I switch apps?
No. With most accounts your mail lives on the provider's servers, so a new app simply connects to it. Signatures, filters and templates usually need rebuilding by hand.
Is a Mac-only email app a problem?
Only if you also work on Windows or need the same app everywhere. If you're Mac-only and your mail is in one provider, a focused app can feel faster.
How long does it take to get used to a new email app?
Most people settle in within a week. Apps that change your habits, such as AI-led or opinionated ones, take longer than a straight client swap.
