Harper alternatives: 5 apps ranked by verified data
Common reasons people leave Harper: english only, and no AI rewriting or tone suggestions. We ranked 5 alternatives by how directly each one replaces Harper, then by reviews, real visits and how recently each app's facts were checked against its own website. LanguageTool currently ranks first.
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Show all 5 alternativesThe best Harper alternative for…
The highest-ranked app in this list for each need.
Best Harper alternative for most people
LanguageToolMany more languages and deeper checks, with an optional self-hosted server.
Best Harper alternative for a free option
ValeEnforces custom style guides on docs, complementing grammar checks.
Best Harper alternative for a free plan you can upgrade
GrammarlyFar more suggestions plus AI rewriting, if cloud processing is acceptable.
Best Harper alternative for open source
LanguageToolMany more languages and deeper checks, with an optional self-hosted server.
Best Harper alternative for self-hosting
LanguageToolMany more languages and deeper checks, with an optional self-hosted server.
Best Harper alternative for Mac
AntidoteAnother locally installed checker, paid, with English and French.
Best Harper alternative for Windows
ProWritingAidDeeper style, readability and overused-word reports for long-form writers, which Harper's quick grammar checks don't attempt.
Best Harper alternative for Linux
ValeEnforces custom style guides on docs, complementing grammar checks.
Best Harper alternative for iPhone and Android
GrammarlyFar more suggestions plus AI rewriting, if cloud processing is acceptable.
Best Harper alternative for working in the browser
LanguageToolMany more languages and deeper checks, with an optional self-hosted server.
Harper alternatives: common questions
What is the best alternative to Harper?
LanguageTool ranks first right now. Many more languages and deeper checks, with an optional self-hosted server. Vale and Grammarly follow it in our ranking.
Is there a free alternative to Harper?
Yes. LanguageTool (free plan + paid), Vale (open source), Grammarly (free plan + paid) and ProWritingAid (free plan + paid) have a free option. Check each app's verified facts for current plan limits.
Is there an open-source alternative to Harper?
Yes: LanguageTool and Vale. LanguageTool can also be self-hosted.
Which Harper alternatives work on Linux?
Vale runs on Linux.
Why do people switch from Harper?
The complaints we hear most: english only; no AI rewriting or tone suggestions; catches fewer issues than commercial checkers.
How is this list ranked?
Every app is scored with the same published formula: how directly it replaces Harper, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.