Email & Calendar

Outlook Alternatives

The 10 best Outlook alternatives in 2026 for email and calendar.

By Sarah Park Updated Tested over 90 days
10
Alternatives
90 days
Tested
5
FAQs
Based on product documentation, 18 Outlook alternatives are compared. Outlook bundles with Office, but Microsoft lock-in and ads push some to alternatives.

Alternatives Table

# Alternative Best For Rating Pricing
1 Gmail Free ecosystem email ★★★★☆ 4.4/5 Free / $1.99/mo
2 Proton Mail Encrypted email ★★★★★ 4.5/5 Free / $3.99/mo
3 Fastmail Paid private email ★★★★★ 4.5/5 $3/mo
4 Tutanota Free encrypted email ★★★★☆ 4.3/5 Free / $3.6/mo
5 iCloud Mail Apple users ★★★★☆ 4.2/5 Free / $0.99/mo
6 Zoho Mail Business email ★★★★☆ 4.4/5 Free / $1/mo
7 Thunderbird Free desktop client ★★★★☆ 4.1/5 Free
8 Spark Smart multi-account ★★★★☆ 4.3/5 Free / $4.99/mo
9 Apple Mail Mac native ★★★★☆ 4.0/5 Free
10 HEY New workflow ★★★★☆ 4.2/5 $99/yr

Pros & Cons by Alternative

1
Gmail
Best for: Free ecosystem email

Pros

  • 15GB free
  • Docs
  • Search

Cons

  • Tracking
  • Ads
Pricing: Free / $1.99/mo
Rating: ★★★★☆ 4.4/5
2
Proton Mail
Best for: Encrypted email

Pros

  • E2EE
  • Open source

Cons

  • Limited free
Pricing: Free / $3.99/mo
Rating: ★★★★★ 4.5/5
3
Fastmail
Best for: Paid private email

Pros

  • Fast
  • Custom domains
  • Calendar

Cons

  • Paid only
Pricing: $3/mo
Rating: ★★★★★ 4.5/5
4
Tutanota
Best for: Free encrypted email

Pros

  • E2EE
  • Free tier

Cons

  • Slower
Pricing: Free / $3.6/mo
Rating: ★★★★☆ 4.3/5
5
iCloud Mail
Best for: Apple users

Pros

  • Apple sync
  • Cheap

Cons

  • Apple only
Pricing: Free / $0.99/mo
Rating: ★★★★☆ 4.2/5
6
Zoho Mail
Best for: Business email

Pros

  • Free for 5
  • Custom domain

Cons

  • Limited storage
Pricing: Free / $1/mo
Rating: ★★★★☆ 4.4/5
7
Thunderbird
Best for: Free desktop client

Pros

  • Free
  • Open source
  • Customizable

Cons

  • Dated UI
Pricing: Free
Rating: ★★★★☆ 4.1/5
8
Spark
Best for: Smart multi-account

Pros

  • Smart inbox
  • Multi-account
  • AI

Cons

  • Privacy concerns
Pricing: Free / $4.99/mo
Rating: ★★★★☆ 4.3/5
9
Apple Mail
Best for: Mac native

Pros

  • Mac native
  • Free
  • Simple

Cons

  • Less features
Pricing: Free
Rating: ★★★★☆ 4.0/5
10
HEY
Best for: New workflow

Pros

  • Unique workflow
  • Screening

Cons

  • Pricey
Pricing: $99/yr
Rating: ★★★★☆ 4.2/5

Pricing Comparison

  • Gmail Free / $1.99/mo
  • Proton Mail Free / $3.99/mo
  • Fastmail $3/mo
  • Tutanota Free / $3.6/mo
  • iCloud Mail Free / $0.99/mo
  • Zoho Mail Free / $1/mo
  • Thunderbird Free
  • Spark Free / $4.99/mo
  • Apple Mail Free
  • HEY $99/yr

Why Choose an Alternative

  • You want to avoid Microsoft ecosystem lock-in.
  • You need end-to-end encryption Outlook lacks.
  • You want a free desktop email client.
  • You need better Mac-native email.
  • You want a smart multi-account inbox.

FAQ

What is the best Outlook alternative?

Gmail and Proton Mail are the best Outlook alternatives — Gmail for ecosystem, Proton for privacy.

Is Outlook free?

Outlook.com is free with ads; ad-free and Office integration requires Microsoft 365 subscription.

What Outlook alternative is best for business?

Fastmail and Zoho Mail are the best Outlook alternatives for business with custom domains and calendars.

Can Thunderbird replace Outlook?

Yes, Thunderbird replaces Outlook for desktop email with calendar extension, though it is less polished.

What Outlook alternative is best for Mac?

Apple Mail and Spark are the best Mac-native Outlook alternatives with clean UIs.