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strongSwan vs Libreswan: catalog facts
strongSwan	Libreswan
Free Free under GPLv2, with commercial licensing available as an option.	Free Free software under GPLv2.
Windows, macOS, Linux, Android, Self-hosted, Command line	macOS, Linux, Command line
Thorough IKEv2 implementation with many IETF extensions Runs on Linux, Android, FreeBSD, macOS and Windows	Standards-based IPsec with IKEv1 and IKEv2 Packaged in Fedora, RHEL/EPEL and Arch Linux
Configuration requires solid IPsec knowledge Mainly configured through files and the command line	IPsec configuration has a steep learning curve No graphical interface
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.