G2 Vendor Directory

K-9 Mail vs. Superhuman Mail

A side-by-side comparison based on G2 review data.

MetricK-9 Mail

by Opensource

Superhuman Mail

by Superhuman

Overall rating4.54.7
Review count131,321
Ease of use8.79.3
Ease of setup10.09.4
Quality of support8.69.6
Meets requirements9.09.3
NPS69.23076985.614308
Small Business46.2%78.2%
Mid-Market30.8%18.3%
Enterprise23.1%3.5%
Total page views1372,279
Total LLM citations94834,092

K-9 Mail

K-9 is an opensource email client based on the Email application shipped with the initial release of Android. K-9 is focused on making it easy to chew through large volumes of email.

Pros

    Superhuman Mail

    Superhuman Mail is the AI-native email app that helps high-performing teams fly through their inboxes and focus on what matters. Built for speed, clarity, and collaboration, Superhuman helps professionals save four hours per person, per week. Smart triage, lightning-fast UX, and powerful integrations let you move through messages in record time without losing context or control. Whether you're following up with prospects, clearing internal threads, or managing projects via email, Superhuman gives you the tools to work faster and stay responsive.

    Pros

    • Time-saving
    • Ease of Use
    • Speed
    • Keyboard Shortcuts
    • Intuitive
    • Inbox Management