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Viscosity vs Shimo: catalog facts
Viscosity	Shimo
Paid One-time purchase of $16 after a 30-day free trial, no subscription.	Paid Paid licence with a free trial; Shimo 6 was offered for 29 euros in September.
Windows, macOS	macOS
Native interface on both macOS and Windows Fine-grained DNS and routing control	Supports WireGuard, OpenVPN, IPsec, AnyConnect, Fortinet and SSH in one app Concurrent and automated connections
Paid after the trial OpenVPN only, no WireGuard	macOS only, version 13 or newer Not a VPN service itself; you need your own servers or provider
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is 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 October 2, 2026

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