G2 Vendor Directory

K-9 Mail vs. Trengo

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

MetricK-9 Mail

by Opensource

Trengo

by Trengo

Overall rating4.54.3
Review count13246
Ease of use8.78.8
Ease of setup10.08.4
Quality of support8.69.0
Meets requirements9.08.4
NPS69.23076955.327869
Small Business46.2%72.8%
Mid-Market30.8%25.2%
Enterprise23.1%2.0%
Total page views137296
Total LLM citations9488,955

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

    Trengo

    Trengo is an AI-first customer communication platform used by 17,000+ people worldwide. WhatsApp Business API, email, live chat, voice, and social channels connect into one shared inbox where AI agents resolve up to 80% of repetitive conversations automatically, in 70+ languages, 24/7. AI agents handle FAQs, qualify leads, update contact details, and escalate to humans when needed across every channel, without code. Native integrations include HubSpot, Salesforce, Shopify, WooCommerce, Magento, Lightspeed, and Klaviyo.

    Pros

    • Ease of Use
    • Helpful
    • Customer Support
    • Features
    • Communication
    • Easy Setup