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SigmaOS vs Horse: catalog facts
SigmaOS	Horse
Freemium A free tier is available. Heavier use moves to a paid subscription.	Paid 14-day free trial, then USD 70 a year; a payment card is required for the trial.
macOS	Windows, macOS, Linux
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Trails keep every page linked to the one that led to it Lets you resume research sessions across days
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	Annual subscription with a card required for the trial Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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