Compare software

Harper vs LTeX+: catalog facts
Harper	LTeX+
Free Free and open source.	Free Free and open source under the MPL-2.0 licence.
macOS, Web, Browser extension, Command line	Command line
All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS	Understands LaTeX, Markdown, Typst and many other markups Works in any editor with an LSP client
English only Rule-based checks do not rewrite text the way AI assistants do	Needs an editor client or command-line use; no standalone interface Setup is more technical than a grammar app
Downloadable app, Web application, Browser extension	Downloadable app
Open source	Open source
License not stated	License: MPL-2.0
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

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