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HorseSigmaOS
Paid

14-day free trial, then USD 70 a year; a payment card is required for the trial.

 Freemium

A free tier is available. Heavier use moves to a paid subscription.

Windows, macOS, Linux macOS
  • Trails keep every page linked to the one that led to it
  • Lets you resume research sessions across days
  • Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…
  • Annual subscription with a card required for the trial
  • Closed source
  • It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…
Downloadable app Downloadable app
Closed source Closed source
License not stated License not stated
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

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