Compare software

Zen Browser vs Horse: catalog facts
Zen Browser	Horse
Free Free and open source, funded by donations.	Paid 14-day free trial, then USD 70 a year; a payment card is required for the trial.
Windows, macOS, Linux	Windows, macOS, Linux
Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work	Trails keep every page linked to the one that led to it Lets you resume research sessions across days
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	Annual subscription with a card required for the trial Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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