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Viscosity vs Eddie: catalog facts
Viscosity	Eddie
Paid One-time purchase of $16 after a 30-day free trial, no subscription.	Free Free and open source under GPLv3; the AirVPN service itself is separate.
Windows, macOS	Windows, macOS, Linux, Android, Command line
Native interface on both macOS and Windows Fine-grained DNS and routing control	Network lock and leak prevention Works with other OpenVPN or WireGuard providers, not only AirVPN
Paid after the trial OpenVPN only, no WireGuard	Tunnel over SSH or SSL requires an AirVPN subscription Interface and defaults are oriented around AirVPN
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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