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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
2Grammarly logoGrammarlyFree plan + paidNoWeb, Windows, macOS +34 of 459.6
3Antidote logoAntidotePaidNoWindows, macOS, Web +34 of 457.2
  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. Grammarly logo

    2. Grammarly

    Best for: English writers who want corrections and AI help everywhere they type, without changing apps

    Free plan + paidWeb, Windows, macOS, iOS, Android, Browser extension

    59.6

    score / 100

    Why switch from Harper

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

    Pros

    • Works across browsers, desktop apps and phone keyboards
    • Free plan is genuinely useful for spelling and grammar
    • Team style guides and brand tones on business plans

    Cons

    • Text is processed in the cloud, which rules it out for some work
    • Best features need Pro, and monthly billing is expensive
    • Mostly English; weak for other languages
    Visit Grammarly Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    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 Grammarly a good Harper alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, $0/month
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
    Starting price
    $12 per member/month, billed annually (Pro)
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
    Free AI prompts
    100 per month
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
    Users
    Over 40 million people
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
  3. Antidote logo

    3. Antidote

    Best for: Bilingual English–French writers and translators who want thorough, explained corrections

    PaidWindows, macOS, Web, iOS, Android, Browser extension

    57.2

    score / 100

    Why switch from Harper

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

    Pros

    • Excellent French as well as English correction
    • Dictionaries and grammar guides built in
    • Installs locally and works across desktop apps

    Cons

    • No free plan
    • Interface is dense compared with browser checkers
    • Only English and French
    Visit Antidote Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    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 Antidote a good Harper alternative?

    Verified facts

    4 of 4 verified
    Languages
    English and French
    Checked Oct 25, 2026antidote.info(opens source in a new tab)
    Desktop platforms
    Windows and Mac
    Checked Oct 25, 2026antidote.info(opens source in a new tab)
    Translations
    2.8 million words and expressions
    Checked Oct 25, 2026antidote.info(opens source in a new tab)
    Family plan
    Up to 5 users
    Checked Oct 25, 2026antidote.info(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.