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Tunnelblick vs Viscosity: catalog facts
Tunnelblick	Viscosity
Free Free and open source under the GPL version 2.	Paid One-time purchase of $16 after a 30-day free trial, no subscription.
macOS	Windows, macOS
Bundles OpenVPN and drivers, no extra installs No ads, tracking or logging	Native interface on both macOS and Windows Fine-grained DNS and routing control
macOS only OpenVPN only; you need a VPN server to connect to	Paid after the trial OpenVPN only, no WireGuard
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
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.