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Harper alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

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.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1LanguageTool logoLanguageToolFree plan + paidYesWeb, Windows, macOS +35 of 566.5
2Vale logoValeOpen sourceYesmacOS, Windows, Linux4 of 462.6
  1. LanguageTool logo

    1. LanguageToolTop pick

    Best for: People who write in several languages, or who want a checker they can self-host

    Free plan + paidOpen sourceSelf-hostableWeb, Windows, macOS, iOS, Browser extension, Self-hosted

    66.5

    score / 100

    Why switch from Harper

    Many more languages and deeper checks, with an optional self-hosted server.

    Pros

    • Strong support for over 30 languages
    • Open-source engine can be self-hosted
    • Works in Word, Google Docs, LibreOffice and browsers

    Cons

    • Free tier caps text length per check
    • Self-hosted version lacks the premium AI checks
    • Tone and rewriting help is lighter than AI-first tools
    Visit LanguageTool Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is LanguageTool a good Harper alternative?

    Verified facts

    5 of 5 verified
    Languages
    More than 30
    Checked Oct 25, 2026languagetool.org(opens source in a new tab)
    License
    LGPL-2.1
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Characters per check
    2,000 free / 150,000 Premium
    Checked Oct 25, 2026languagetool.org(opens source in a new tab)
    Money-back guarantee
    14 days
    Checked Oct 25, 2026languagetool.org(opens source in a new tab)
    Desktop and mobile apps
    Windows, macOS, iOS
    Checked Oct 25, 2026languagetool.org(opens source in a new tab)
  2. Vale logo

    2. Vale

    Best for: Documentation teams that want style-guide rules checked in editors and CI

    Open sourcemacOS, Windows, Linux

    62.6

    score / 100

    Why switch from Harper

    Enforces custom style guides on docs, complementing grammar checks.

    Pros

    • Enforces custom style rules consistently across a team
    • Ready-made packages for Microsoft, Google and Red Hat styles
    • Runs offline and in CI pipelines

    Cons

    • No grammar correction or AI rewriting
    • Command-line setup needs technical comfort
    • Writing good rules takes effort
    Visit Vale Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Vale a good Harper alternative?

    Verified facts

    4 of 4 verified
    License
    MIT
    Checked Oct 25, 2026vale.sh(opens source in a new tab)
    Platforms
    macOS, Windows, Linux; offline
    Checked Oct 25, 2026vale.sh(opens source in a new tab)
    Install
    Homebrew, plus other package managers
    Checked Oct 25, 2026vale.sh(opens source in a new tab)
    Editor integrations
    VS Code, Neovim, Sublime, Zed, Emacs, JetBrains
    Checked Oct 25, 2026vale.sh(opens source in a new tab)

The best Harper alternative for…

The highest-ranked app in this list for each need.

LanguageTool logo

Best Harper alternative for most people

LanguageTool

Many more languages and deeper checks, with an optional self-hosted server.

Vale logo

Best Harper alternative for a free option

Vale

Enforces custom style guides on docs, complementing grammar checks.

Grammarly logo

Best Harper alternative for a free plan you can upgrade

Grammarly

Far more suggestions plus AI rewriting, if cloud processing is acceptable.

LanguageTool logo

Best Harper alternative for open source

LanguageTool

Many more languages and deeper checks, with an optional self-hosted server.

LanguageTool logo

Best Harper alternative for self-hosting

LanguageTool

Many more languages and deeper checks, with an optional self-hosted server.

Antidote logo

Best Harper alternative for Mac

Antidote

Another locally installed checker, paid, with English and French.

ProWritingAid logo

Best Harper alternative for Windows

ProWritingAid

Deeper style, readability and overused-word reports for long-form writers, which Harper's quick grammar checks don't attempt.

Vale logo

Best Harper alternative for Linux

Vale

Enforces custom style guides on docs, complementing grammar checks.

Grammarly logo

Best Harper alternative for iPhone and Android

Grammarly

Far more suggestions plus AI rewriting, if cloud processing is acceptable.

LanguageTool logo

Best Harper alternative for working in the browser

LanguageTool

Many 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.