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Harper replaces 3 paid apps
One open-source tool, 3 subscriptions it can stand in for. Each pairing below is curated and verified by hand, with the honest catch spelled out. No votes, no pay-to-list.
GrammarlyYES$30/mo
A fast English grammar checker that stays on your device and mostly keeps its opinions to itself.
the verdict →all Grammarly alternatives →
LanguageToolYES$5.47/mo
A fast English grammar checker that stays on your device and mostly keeps its opinions to itself.
the verdict →all LanguageTool alternatives →
Hemingway Editor PlusYESusage-based
A fast English grammar checker that stays on your device and mostly keeps its opinions to itself.
the verdict →all Hemingway Editor Plus alternatives →last updated 2026-08-06 · up to $420/yr replaced · no votes, no pay-to-list