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Viscosity vs Passepartout: catalog facts
Viscosity	Passepartout
Paid One-time purchase of $16 after a 30-day free trial, no subscription.	Freemium Free to use with paid features in the App Store version; the GitHub Mac build has free…
Windows, macOS	macOS, iOS
Native interface on both macOS and Windows Fine-grained DNS and routing control	Supports OpenVPN with the XOR patch as well as WireGuard On-demand rules, DNS override and custom routing
Paid after the trial OpenVPN only, no WireGuard	Apple platforms only Mac build outside the App Store lacks paid features
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 24, 2026

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