Gmail vs Outlook vs iCloud: Which Email Should You Use?

Gmail is the best email service for most people: it has the strongest search, the best spam filter and the most capable built-in AI, and it works well on every device. Outlook is the better pick if your work runs on Windows, Office and Teams, and iCloud Mail is the better pick if you only use Apple devices and care most about privacy.

That is the short answer. The rest of this guide gives a verdict for each matchup, a full comparison table with October 2026 prices, and the details behind each row: storage, privacy, spam, search, AI and custom domains. It also covers the apps (Apple Mail, the Gmail app and the Outlook app), because the app you read mail in is a separate choice from the service that holds it.

Quick verdict: which one wins each matchup?#

Most searches are really a two-way question. Here is the verdict for each pair, before the detail.

• iCloud vs Gmail: Gmail wins on search, spam filtering, free storage (15 GB vs 5 GB) and AI. iCloud wins on privacy tools and price, and it includes a custom domain with every paid plan. Choose iCloud only if every device you own is Apple.
• iCloud Mail vs Outlook: Outlook wins on cross-platform apps, Windows and Office. iCloud wins on privacy and cheap storage. On a Mac and iPhone with no Office habit, iCloud is simpler.
• Gmail vs Outlook: Gmail wins on search, spam and the free tier. Outlook wins if you already pay for Microsoft 365, because the email, 1 TB of storage and the Office apps come together.
• Apple Mail vs the Gmail app vs the Outlook app: these are apps, not mailboxes. Apple Mail is best on Apple devices, the Outlook app is the best free app for mixing accounts on Windows, and the Gmail app is best for Gmail itself.

Gmail vs Outlook vs iCloud: the full comparison table#

This table covers the free consumer plans and the common paid tiers in the US as of October 2026. Prices change, so check each provider's plan page before you buy.

The most misread row is free storage. Google's 15 GB is shared with Drive and Photos. Apple's 5 GB is shared with iCloud Drive, photos and device backups. Outlook.com gives a 15 GB mailbox, but attachments count against your 5 GB of Microsoft cloud storage.

Provider vs client: why the app is a separate choice#

Gmail, Outlook.com and iCloud Mail are email providers. A provider owns your address, stores your mail, runs the spam filter and sets your storage limit. Changing provider changes your address, which is why switching takes real work.

An email client is the app you read mail in. Apple Mail, the Outlook app and the Gmail app are clients, and most of them can show mail from several providers at once. So you can host your address with one company and read it in an app from another. Keep that split in mind for the next section.

Apple Mail vs Gmail vs Outlook: which app should you read mail in?#

When people compare Apple Mail, Gmail and Outlook, they usually mean the apps. Each app can open more than its own company's mail, but each one works best with its own service.

Apple Mail comes with every iPhone, iPad and Mac. It handles iCloud, Gmail, Outlook.com and any IMAP account, and on supported devices it adds Apple Intelligence features such as message summaries and writing tools. It does not run on Windows or Android.

The Outlook app is free on Windows, Mac, iOS and Android. It connects Outlook.com, Gmail, iCloud and IMAP accounts, so it is the usual choice for mixing accounts on a Windows PC. Copilot features need a Microsoft 365 plan that includes them.

The Gmail app is built for Gmail. On mobile it can add some other accounts, but on the web Google retired its POP-based import and Gmailify in January 2026. It is the best way to use Gmail and a weak way to use anything else.

How much storage do you get, and what does it cost?#

Google gives 15 GB free, shared across Gmail, Drive and Photos, so a large photo library can fill it. Google One adds 100 GB for $1.99 a month. Larger Google plans now bundle Gemini AI features, and Google renames these tiers often, so check the plans page for the current line-up.

Apple gives 5 GB free, shared with iCloud Drive, photos and device backups. This is why iPhone owners see "iCloud storage full" so often. iCloud+ is the cheapest upgrade: 50 GB for $0.99, 200 GB for $2.99 and 2 TB for $9.99 a month. Every iCloud+ plan also adds Hide My Email, Private Relay and a custom email domain.

Outlook.com gives a 15 GB mailbox, but attachments count against the 5 GB of Microsoft cloud storage shared with OneDrive. Microsoft 365 Personal costs $9.99 a month or $99.99 a year and includes 1 TB of OneDrive, the Office apps and Copilot. It is good value only if you would buy Office anyway.

Which is best for privacy?#

iCloud Mail has the strongest privacy stance of the three. Apple earns its money from hardware, not ads, and it does not scan iCloud Mail to target ads. iCloud+ adds Hide My Email, which creates random forwarding addresses for sign-up forms, and Private Relay, which hides your IP address in Safari.

Google stopped scanning Gmail content to personalise ads in 2017, so the old claim that "Gmail reads your email for ads" is out of date. Google is still an ad company and builds a profile from its other services. Microsoft's free Outlook.com is also ad-funded, and paid Microsoft 365 removes the ads.

None of the three is end-to-end encrypted. Each provider can technically read your stored mail. If you need a provider that cannot read your messages, look at Proton or a similar service instead.

Which has the best spam filter and search?#

Gmail leads on both. Its spam filter catches almost all junk and rarely files real mail as spam. Its search finds old messages from vague queries and supports operators such as from:, has:attachment and before:. If you keep years of mail and search it often, this alone can decide it.

Outlook.com is close behind on spam, with good phishing protection, and its search is solid for folders and filters. iCloud Mail is the weakest on both: more junk reaches the inbox, and search struggles with large archives and complex queries.

Search depends partly on the app. A client with better search, running over the same iCloud mailbox, can find mail that iCloud's own search misses, without changing your address.

Gemini vs Copilot vs Apple Intelligence: which email AI is best?#

Gemini in Gmail is the most capable email AI for most people. Since January 2026, Help Me Write, suggested replies and thread summaries are free, starting in the US in English. Asking questions about your inbox and Proofread need a Google AI Pro or Ultra plan.

Copilot in Outlook drafts, summarises and suggests replies, and it can draw on your Word files and Teams chats. It is included with Microsoft 365 Personal and Family. If your work lives in Office, that reach across apps is the main reason to pick it.

Apple Intelligence works in Apple Mail on supported iPhones, iPads and Macs. It summarises messages, offers writing tools and highlights priority mail, and much of it runs on the device. It is the most private of the three, but it does less in email and needs recent Apple hardware.

All three share one limit: each AI only works on its own provider's mail inside its own app. If your mail is split across Gmail and iCloud, no built-in assistant sees all of it.

Can you use a custom domain with Gmail, Outlook or iCloud?#

iCloud is the cheapest route. Custom Email Domain is included in every iCloud+ plan, including the $0.99 tier. You can add up to five domains and share them with people in your Family Sharing group. If iCloud+ lapses, mail to the domain stops arriving.

Gmail needs Google Workspace, a paid business plan billed per user. Outlook changed in 2023: Microsoft 365 Personal and Family stopped allowing new custom-domain addresses on 30 November 2023. A new setup now needs a Microsoft 365 Business plan.

With any of them, setup means adding MX, SPF and DKIM records at your domain registrar, plus a DMARC record so your mail is trusted. Each provider shows the exact records to copy.

How do you add Gmail and iCloud to Outlook?#

Outlook can hold your Gmail and iCloud accounts next to Outlook.com. Gmail signs in through Google. iCloud needs an app-specific password, because Apple does not let other apps use your main password.

1. 1

   Turn on two-factor for your Apple Account

   On an iPhone, go to Settings, tap your name, then Sign-In & Security. Two-factor must be on before Apple will create app passwords.

2. 2

   Create an iCloud app-specific password

   Sign in at account.apple.com, open Sign-In and Security, choose App-Specific Passwords and generate one named "Outlook". Copy it.

3. 3

   Add Gmail in Outlook

   In Outlook, open Settings, then Accounts, and choose Add account. Enter your Gmail address and sign in through the Google window. Allow the access Outlook asks for.

4. 4

   Add iCloud in Outlook

   Choose Add account again and enter your @icloud.com address. When Outlook asks for a password, paste the app-specific password, not your Apple Account password.

5. 5

   Check that mail syncs

   Send a test message to each address. If iCloud fails, create a new app-specific password; each one is revoked if you change your main Apple password.

Who should use Gmail, Outlook or iCloud?#

Use Gmail if you own a mix of devices, keep years of mail and search it often, or want the most capable free AI. Its weak spots are a larger data footprint with an ad company and a free 15 GB that photos can eat.

Use Outlook if you live in Windows, Office and Teams, or already pay for Microsoft 365. The email, 1 TB of storage and Copilot then come with software you use anyway. It is less compelling as a free account, and custom domains now need a business plan.

Use iCloud Mail if every device you own is Apple and you want a clean, private inbox. It is the cheapest way to get a custom domain. Skip it if you use Windows or Android often, or rely on heavy search.

Do you have to choose just one?#

Most people already have two or three of these addresses: a Gmail from an Android phone, an old Hotmail or work Outlook, an iCloud address from an iPhone. Moving everything into one provider is real work. You move the mail, set up forwarding, update your address everywhere and give up whatever the old provider did well.

The alternative is to keep each account where it is and read them all in one client. Your addresses do not change, and each provider keeps doing what it is good at. Apple Mail and the Outlook app already do this for free. The question then becomes which app you want to run them in.

Where AI Emaily fits#

We build AI Emaily, so weigh this section with that in mind. AI Emaily is an email client, not a provider. It does not give you a new address. It connects the Gmail, Outlook and iCloud accounts you already have and shows them in one inbox, with one AI assistant over all of them.

Gmail and Outlook connect through their own sign-in windows. iCloud connects with the app-specific password from the steps above, and most other IMAP providers, such as Fastmail, work the same way. Proton is the exception: it needs Proton Mail Bridge, a desktop app on your own computer, which a cloud client like ours generally cannot reach.

The difference from the built-in assistants is reach. Gemini sees only Gmail, Copilot only Microsoft mail and Apple Intelligence only Apple Mail. AI Emaily drafts replies, summarises threads and searches across every account you connect. Its tone comes from a Context brain and client profiles that you set up yourself. In the default Copilot mode it drafts and waits, and nothing sends until you approve it.

Where it is the wrong pick: if all your mail is in one Gmail account, Gemini in Gmail may be enough. If you want a free client for mixing accounts, Apple Mail and Outlook already do that. On Android, AI Emaily is a web app you install to the home screen rather than a native app, and the Mac app runs on Apple Silicon only. Every plan starts with a 7-day free trial at app.aiemaily.com/signup.

The bottom line#

Gmail is the best default for most people: the best search, spam filtering and AI, on any device. Outlook is the pick for Microsoft 365 households and Windows users. iCloud Mail is the pick for all-Apple users who want privacy and a cheap custom domain.

If you already have more than one of these, you may not need to choose. All three work in other apps, so you can keep them and read them in one place.