Compare software

Lemma vs Tangent: catalog facts
Lemma	Tangent
Free Free and open source under the GPL-3.0-or-later licence, with optional donations.	Free Free and open source under the Apache 2.0 licence.
Linux	Windows, macOS, Linux
Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks	Notes are plain Markdown files on your own disk Sliding panels and a branching map for following linked notes
Linux only No sync described on the homepage	No built-in sync or mobile app mentioned Smaller community than Obsidian or Logseq
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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