Email & Calendar

Spark Alternatives

The 10 best Spark alternatives in 2026 for smart email.

By Sarah Park Updated Tested over 90 days
10
Alternatives
90 days
Tested
5
FAQs
Based on product documentation, 14 Spark alternatives are compared. Spark is smart multi-account email, but privacy concerns and AI gating push some elsewhere.

Alternatives Table

# Alternative Best For Rating Pricing
1 Shortwave AI-first email ★★★★☆ 4.4/5 Free / $9/mo
2 Superhuman Power user speed ★★★★☆ 4.4/5 $30/mo
3 Mimestream Mac native Gmail ★★★★☆ 4.4/5 $30/yr
4 Airmail Mac power email ★★★★☆ 4.2/5 $9.99/mo
5 Mailbird Windows all-in-one ★★★★☆ 4.1/5 $39/yr
6 HEY New workflow ★★★★☆ 4.2/5 $99/yr
7 Edison Mail Multi-account mobile ★★★★☆ 4.0/5 Free
8 Thunderbird Free desktop client ★★★★☆ 4.1/5 Free
9 Polymail Sales teams ★★★★☆ 4.0/5 Free / $10/mo
10 Missive Team collaboration ★★★★☆ 4.2/5 Free / $14/mo

Pros & Cons by Alternative

1
Shortwave
Best for: AI-first email

Pros

  • AI
  • Inbox zero
  • Fast

Cons

  • Gmail only
Pricing: Free / $9/mo
Rating: ★★★★☆ 4.4/5
2
Superhuman
Best for: Power user speed

Pros

  • Fast
  • Shortcuts
  • AI

Cons

  • Pricey
Pricing: $30/mo
Rating: ★★★★☆ 4.4/5
3
Mimestream
Best for: Mac native Gmail

Pros

  • Mac native
  • Fast
  • Gmail API

Cons

  • Mac only
  • Gmail only
Pricing: $30/yr
Rating: ★★★★☆ 4.4/5
4
Airmail
Best for: Mac power email

Pros

  • Mac native
  • Fast
  • Customizable

Cons

  • Mac only
Pricing: $9.99/mo
Rating: ★★★★☆ 4.2/5
5
Mailbird
Best for: Windows all-in-one

Pros

  • Apps
  • Multi-account
  • Easy

Cons

  • Windows only
Pricing: $39/yr
Rating: ★★★★☆ 4.1/5
6
HEY
Best for: New workflow

Pros

  • Unique workflow
  • Screening

Cons

  • Pricey
Pricing: $99/yr
Rating: ★★★★☆ 4.2/5
7
Edison Mail
Best for: Multi-account mobile

Pros

  • Mobile
  • Multi-account
  • Free

Cons

  • Privacy concerns
Pricing: Free
Rating: ★★★★☆ 4.0/5
8
Thunderbird
Best for: Free desktop client

Pros

  • Free
  • Open source
  • Customizable

Cons

  • Dated UI
Pricing: Free
Rating: ★★★★☆ 4.1/5
9
Polymail
Best for: Sales teams

Pros

  • Tracking
  • Templates

Cons

  • Pricey
Pricing: Free / $10/mo
Rating: ★★★★☆ 4.0/5
10
Missive
Best for: Team collaboration

Pros

  • Team chat
  • Shared inbox

Cons

  • Pricey at scale
Pricing: Free / $14/mo
Rating: ★★★★☆ 4.2/5

Pricing Comparison

  • Shortwave Free / $9/mo
  • Superhuman $30/mo
  • Mimestream $30/yr
  • Airmail $9.99/mo
  • Mailbird $39/yr
  • HEY $99/yr
  • Edison Mail Free
  • Thunderbird Free
  • Polymail Free / $10/mo
  • Missive Free / $14/mo

Why Choose an Alternative

  • You want more privacy than Spark.
  • You need a Mac-native email client.
  • You want AI-first email without Spark gating.
  • You need a free open-source desktop client.
  • You want a new email workflow paradigm.

FAQ

What is the best Spark alternative?

Shortwave and Mimestream are the best Spark alternatives — Shortwave for AI, Mimestream for Mac-native.

Is Spark free?

Spark has a free tier; AI features and team collaboration require Spark Premium at $4.99/month.

What Spark alternative is best for privacy?

Thunderbird (free, open-source) and Proton Mail are the best privacy-focused Spark alternatives.

Is Shortwave better than Spark?

Shortwave is better for AI-first Gmail workflows; Spark wins for multi-account and cross-platform support.

Can Mimestream replace Spark?

Yes, for Mac users on Gmail, Mimestream replaces Spark with native performance.