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Mobile app · Internet & communication

K-9 Mail

K-9 Mail is an email client, available on Android: multiple accounts and notifications.

  • Completely free
  • Android
  • Open source

Overview

K-9 Mail is an email client, available on Android.

Features described in its F-Droid listing: multiple accounts and notifications.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email” — official website, 10 November 2026
  • “Supports multiple accounts” — F-Droid, 10 November 2026
  • “Automatic background synchronization or push notifications” — F-Droid, 10 November 2026

At a glance

K-9 Mail is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • No advertising
  • Commercial use allowed

Sources and checks

  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from F-Droid (credit card, source code, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 6 November 2026
  • Listing written automatically from verified facts.

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