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Spark vs Outlook: which email app fits you
Both Spark and Outlook handle several accounts, so that isn't what separates them. What does is price, AI, and the way each sorts your mail.
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The short version
- Pick Spark if you want one free client with unlimited accounts, a Smart Inbox and a calendar.
- Pick Outlook if you live in Microsoft 365, or you want Microsoft's own rules and search, and its licensed Copilot features.
- Both can hold Gmail accounts, so your provider rarely decides it.
- Try each on one real account for a week before you commit.
The short answer
Pick Spark if you want one polished client for lots of accounts. It has a Smart Inbox and a calendar, and a free plan to start on. Pick Outlook if your work runs on Microsoft 365, or you want Microsoft's own rules and search, and its licensed Copilot features. Both can hold Gmail accounts, so your provider rarely settles it. What does is how you sort mail. Whether you want AI matters too, and so do the devices you use.
Who each one is for
Spark is a mail client for Mac and Windows, and for iOS and Android. Its pricing page says the Free plan includes a Smart Inbox, a calendar, smart notifications and unlimited email accounts. Plus and Pro add AI features, meeting notes and team collaboration, along with integrations. Both start with a seven-day trial when you buy in the app.
Outlook is Microsoft's mail and calendar app, and for many organizations it comes inside Microsoft 365. Microsoft lists the steps for adding accounts from Gmail, iCloud and Yahoo. Which Outlook matters, though. Outlook.com on the web, the new Outlook for Windows, the classic desktop app and the mobile apps all differ, and Microsoft's help pages say so feature by feature.
Accounts and providers
Spark's home page lists Outlook and Exchange among the accounts it connects, along with iCloud, Yahoo and IMAP. The Free plan lists unlimited accounts. Outlook is the natural home for Microsoft accounts, and it takes accounts from other providers too.
If most of your mail is Microsoft 365 and a company policy points you at Outlook, you're done. If you've got five accounts across four providers and no policy, Spark's free multi-account plan is the easier start.
AI and price shape
Spark's AI sits on the paid plans. The pricing page describes Spark +AI, an AI Assistant and meeting notes on Plus and Pro, with monthly quotas, and a limited preview on Free. As of October 2026 it marks Autopilot and Auto-Drafts as coming soon, so judge Spark by what's live today.
Outlook's AI depends on licensing. Microsoft's Copilot in Outlook FAQ lists prioritizing the inbox and summarizing threads, plus drafting and coaching. It says some features need a Copilot license. Microsoft sells Outlook in several forms, so check what your own account includes before you assume.
Sorting and searching your mail
Spark sorts with its Smart Inbox, which pulls newsletters and notifications away from the rest. Outlook uses rules, which Microsoft says run as soon as mail arrives, and Sweep. Sweep rules run once a day and, per Microsoft, work with Outlook.com, Hotmail, Live.com and Microsoft 365 accounts. They don't work with Gmail, Yahoo or any other IMAP account.
For search, Outlook's operators are in Microsoft's search guide, including from:, hasattachment:yes and received:. It returns at most the first 1,000 results. Our search builder writes the Outlook and Gmail forms from one set of choices.
Platforms and feel
Spark runs on all four of Mac, Windows, iOS and Android, and its pricing page says a subscription bought on one platform works on the others. Outlook comes as Outlook.com on the web, the new Outlook for Windows, the classic desktop app, Outlook for Mac and the iOS and Android apps, with differences between them that Microsoft's help pages note. So check that the version you'll use every day has the feature you care about. It isn't enough that "Outlook" has it somewhere.
Teams and calendars
Spark's Free plan includes a calendar. Its paid plans add team collaboration, which its pages describe as sharing and delegating ownership, and tracking progress. Outlook's calendar is part of the same app, and Microsoft documents searching it with operators such as startdate: and organizer:. If you work in a team, compare how each handles shared work before you compare themes and icons. That's the part that's hard to change later.
The cost of switching
Moving mail apps costs less than it used to, because your mail stays with your provider. What you lose is habit. Shortcuts, swipe actions, signatures, rules: they all live in the app. Write down the three things you do most and check each in the app you're moving to before you commit. The rest you can learn in a week.
Where a third option fits
If you want one assistant that works across Gmail and Outlook and asks before it acts, that's Otto, and it's ours. Free covers one connected account, and it runs on the web and on iPhone. It has no native Mac or Windows app, and it doesn't connect iCloud or Yahoo, or IMAP accounts. The Spark alternatives page says more, and Otto vs Spark sets the two side by side.
How to decide in a week
- List your accounts and providers. If a work policy names Outlook, stop here.
- Move one real account into each app for three days.
- Notice what you reach for: the Smart Inbox, a rule, the search box, the calendar.
- Check that the AI you'd pay for is live on the plan you'd buy.
- Keep the one you didn't want to close.
Questions, answered
Is Spark free?
For the basics, yes. The Free plan lists a Smart Inbox, a calendar, smart notifications and unlimited email accounts. The AI features and meeting notes sit on paid plans, and so do the team tools.
Can Outlook manage Gmail accounts?
Yes. Microsoft documents adding accounts from Gmail, iCloud and Yahoo. Some features, like Sweep, don't work with Gmail or other IMAP accounts.
Which has better AI, Spark or Outlook?
They gate it differently. Spark's AI features sit on its paid plans, and some announced ones are marked as coming soon. Outlook's Copilot features depend on Microsoft licensing. Compare what's live on the plan you'd buy.
Try your next step in Otto
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