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Horse vs Vivaldi: catalog facts
Horse	Vivaldi
Paid 14-day free trial, then USD 70 a year; a payment card is required for the trial.	Free Free, funded by default search engine and bookmark placement deals.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
Trails keep every page linked to the one that led to it Lets you resume research sessions across days	Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel
Annual subscription with a card required for the trial Closed source	Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
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.