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

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