v1.0.0
First public release: the Harper grammar checker integrated into Joplin desktop's Markdown editor.
Features
- Fast, fully offline grammar and spell checking powered by Harper (Automattic) — the WASM engine ships inside the plugin; no network calls, no telemetry.
- Colored squiggly underlines, one color per issue type (all 21 Harper lint kinds), matching Harper's own palette in light and dark themes.
- Harper-style suggestion card on hover: issue type, explanation with the flagged word highlighted, one-click fix pills, add-to-dictionary, dismiss (ignore), and a disable-rule toggle.
- English dialects: American, British, Australian, Canadian.
- External dictionary: point the plugin at a plain word-per-line file — words added from the editor are appended there, and outside changes are picked up automatically (~60 s), so the list can be synced between machines and shared with other Harper tools.
- Settings: master switch, dialect, lint debounce, external dictionary path, advanced per-rule JSON overrides.
Requirements
Joplin desktop 3.1+, Markdown editor only, desktop only. First check after startup takes a second or two (engine warm-up); afterwards ~50 ms per pass on a typical note.
Install: download io.github.pmslava.harper.jpl below → Joplin → Tools → Options → Plugins → Install from file.