Side by side

SIEVER Mail vs Sterna Mail

Both stand on email clients. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

SIEVER Mail

Free plan LinuxMacWindows

SIEVER Mail focuses on multi-account desktop email with local storage, search, organization, and privacy-oriented handling. Its active-development status and build-time extension model may matter to users seeking a settled platform.

Visit SIEVER Mail

Sterna Mail

Free plan Android

Sterna Mail focuses on private, protocol-flexible email for Android, with offline caching and scheduling included. Its GPLv3 licensing and multiple installation routes suit users comfortable with open-source mobile software.

Visit Sterna Mail

The facts

	SIEVER Mail	Sterna Mail
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Linux, Mac, Windows	Android
Lowest paid plan	Not published	Free or on request
Plans published	None	2
Maker	Not published	Not published
Website	github.com	sternamail.org
On email clients	#94 of 142	#98 of 142

SIEVER Mail: what it does well

Supports multiple IMAP/SMTP accounts
Unified inbox for supported accounts
Local SQLite mail storage
No telemetry or third-party tracking
Linux, macOS, and Windows support

What to know first

No paid plans or trial listed
Project remains in active development
One build-time extension limit
No web or mobile client listed

Sterna Mail: what it does well

Supports JMAP and IMAP/SMTP
Offline unified inbox
Scheduled sending and calendar tools
Blocks remote images and tracking pixels
No analytics or advertising

What to know first

Android platform only
Version 1.6.0 requires Android 8.0 or newer
OpenPGP needs an app such as OpenKeychain

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