OSS Discovery

UN
Global
OPERATING SYSTEMS & VIRTUALIZATION
CLOUD-READY
ACTIVELY MAINTAINED
FREE
K 9 Mail

K 9 MAIL

K 9 Mail is a secure Android email client, offering OpenKeychain integration, supporting multiple accounts and encryption protocols, targeting privacy-focused users.

GITHUB STARS
13k
+12% this month
FORKS
2.7k
Active community
LAST PUSH
Apr 24, 2026
High momentum
WATCHERS
362
Tracking updates
LICENSE
Apache-2.0
Commercial use
K 9 Mail is a secure Android email client, offering OpenKeychain integration, supporting multiple accounts and encryption protocols, targeting privacy-focused users.

High Performance

Built for speed and minimal overhead.

Self-hostable

Docker, Kubernetes, or bare metal

Developer Native

Programmable via any language workflow

SUPPORTED LANGUAGES

Kotlin
Kotlin
Java
Java
Python
Python
Shell
Shell
AIDL
AIDL
JavaScript
JavaScript

VISUAL INTERFACE

Screenshot 1
Screenshot 2
Screenshot 3

The Quick Glance

Status
Active
Category
Operating Systems & Virtualization
Pricing
Free
Self-Hosted
No
Available on
Windows
macOS
Linux
Latest Release
THUNDERBIRD_18_0
Apr 15, 2026

Relative Standing — across 1,284 tools

STARS13k
Top 29% globally
FORKS2.7k
Top 16% in Open Source
ACTIVITYVery High
Top 18% Activity
WATCHERS362
Top 9% Community