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Skim vs LiquidText: catalog facts
Skim	LiquidText
Free Free and open source under the BSD licence.	Freemium Free to install from the app stores; the homepage does not list the prices of paid…
macOS	Windows, macOS, iOS
SyncTeX integration makes it the standard viewer for LaTeX work Annotation and snapshot tools designed for reading academic papers	Excerpts and notes can be arranged and linked on a workspace Suited to reviewing long documents
macOS only Notes are stored in Skim's own format unless explicitly embedded	Pricing is not clearly stated on the homepage Its workflow takes some learning compared with a plain PDF reader
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
Not stated if an account is needed	Not stated if an account is 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 September 23, 2026

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