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