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