Harper AlternativesOnly apps categorised as Grammar Checkers

The best Grammar Checker alternative to Harper is LanguageTool, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Harper and many of them are Grammar Checkers so hopefully you can find a suitable replacement. Other interesting Grammar Checker alternatives to Harper are DeepL Write, Grammarly, Grammalecte and QuillBot.

Harper iconHarper
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Harper is an English grammar checker designed to be just right. I created it after years of dealing with the shortcomings...

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Harper alternatives page was last updated May 6, 2025
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  1. ProWritingAid icon

    ProWritingAid

    Sponsored

    A complete grammar checker, style editor, and mentor, offering 25 writing reports. It identifies repetitive language, vague words, overuse of adverbs, passive voice, and complex structures while providing a word explorer and thesaurus.

    96 ProWritingAid alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • GB flagUnited Kingdom

    Platforms

    • Mac
    • Windows
    • Online
    • Microsoft Edge
    • Google Chrome
    • Microsoft Outlook
    • Microsoft Word
    • Google Docs
    • Google Workspace
    • Mozilla Firefox
    ProWritingAid screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  Spell Checking
    2.  Automated proofreading
    3.  Grammar explanations
    4.  Grammatical Error Checking
    5.  Grammar tool
    6.  Cloning in multiple languages styles
  2. LanguageTool icon

    LanguageTool

     167 likes
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    Proofreading software compatible with LibreOffice, Word, Firefox, and Chrome. Supports 20+ languages, offering two tiers: free and premium, with features like customizable checks, Microsoft add-on, and error detection in gender, ISBN, and IBAN. Offers open-source web and desktop versions.

    76 LanguageTool alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • iPhone
    • iPad
    • Microsoft Edge
    • ONLYOFFICE
    • Google Chrome
    • Microsoft Outlook
    • Safari
    • Visual Studio Code
    • Microsoft Word
    • Eclipse
    • TinyMCE
    • Google Docs
    • Thunderbird
    • Vim
    • Sublime Text
    • GNU Emacs
    • Opera
    • Gmail
    • LibreOffice
    • Apache OpenOffice
    • Mozilla Firefox
    • LibreOffice - Writer
    LanguageTool screenshot 1

    Properties

    1.  Privacy focused
    2.  Lightweight

    Features

    1.  Multiple languages
    2.  Automated proofreading
    3.  Proofreading
    4.  Grammar tool
    5.  Custom dictionaries
    6.  Spell Checking
    7.  Dark Mode
    8.  Microsoft Edge extension
    9.  Ad-free
    10.  Neural network
    11.  N-grams
    12. Obsidian icon  Obsidian Integration

    LanguageTool VS Harper

     

    • LanguageTool is the most popular Web-based, Windows, Mac & iPhone alternative to Harper.

    • LanguageTool is the most popular Open Source & free alternative to Harper.

    • LanguageTool is Freemium and Open SourceHarper is Free and Open Source
    • LanguageTool is Privacy focused and LightweightHarper is not according to our users
  4. DeepL Write icon

    DeepL Write

     72 likes
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    An AI tool enhancing English and German communication by offering robust suggestions on phrasing, tone, style, and grammar, ideal for professionals, multilingual teams, and varied proficiency users.

    108 DeepL Write alternatives

    License model

    • Free • Proprietary

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Online
    DeepL Write screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  AI Writing
    2.  Spell Checking
    3.  Grammar tool
    4.  AI-Powered
    5.  Ad-free
    6.  Text to Speech
    7.  Live Preview
    8.  No Coding Required

    DeepL Write VS Harper

     
  5. Ad
    Screenshot
    Trinka AI icon
    Trinka AI

    Trinka AI - the complete writing assistant. Trinka is an online grammar checker for academic and technical writing. From advanced English grammar errors to scientific spelling, Trinka corrects it all!.

    https://www.trinka.ai
    Learn More
  6. Grammarly icon

    Grammarly

     242 likes
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    Delivers real-time spelling, grammar, and style check, generative AI for instant drafts, comprehensive writing feedback, and enhanced sentence clarity and word choice for effective communication on multiple platforms, including desktops and web browsers.

    116 Grammarly alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Online
    • Microsoft Edge
    • Google Chrome
    • Microsoft Outlook
    • Safari
    • Microsoft Word
    • Software as a Service (SaaS)
    • Mozilla Firefox
    Grammarly screenshot 1

    Properties

    1.  Lightweight
    2.  Security-focused
    3.  Educational

    Features

    1.  Grammar tool
    2.  Grammatical Error Checking
    3.  Automated proofreading
    4.  Plugin for office programs
    5.  Spell Checking
    6. Microsoft Word icon  Microsoft Word integration
    7.  Browser integration
    8.  Ad-free
    9.  Dark Mode
    10.  Works Offline
    11.  AI-Powered
    12.  No registration required

    Grammarly VS Harper

     

    • Grammarly is the most popular SaaS alternative to Harper.

    • Grammarly is Freemium and ProprietaryHarper is Free and Open Source
    • Grammarly is LightweightHarper is not according to our users
  7. Grammalecte icon

    Grammalecte

     29 likes
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    Grammalecte is a French grammar checker.

    29 Grammalecte alternatives

    License model

    • Free • Open Source

    Application type

    Country of Origin

    • FR flagFrance
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • Google Chrome
    • Python
    • Thunderbird
    • Vim
    • Sublime Text
    • GNU Emacs
    • Pluma
    • LibreOffice
    • Mozilla Firefox
    • LibreOffice - Writer
    • ONLYOFFICE
    Grammalecte screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Spell Checking
    2.  Typography
    3.  Works Offline
    4.  Ad-free

    Grammalecte VS Harper

     
  8. QuillBot icon

    QuillBot

     8 likes
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    QuillBot can help you paraphrase, summarize, grammar check and even plagiarism check all of your essays using AI.

    37 QuillBot alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Online
    • Google Chrome
    • Microsoft Word
    • Android
    • Microsoft Edge
    • Safari
    • Windows
    QuillBot screenshot 1

    QuillBot Features

    1.  Spell Checking
    2.  AI-Powered
    3.  Web-Based

    QuillBot VS Harper

     

    • QuillBot is the most popular Android alternative to Harper.

    • QuillBot is Freemium and ProprietaryHarper is Free and Open Source
  10. ProWritingAid icon

    ProWritingAid

     28 likes
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    A complete grammar checker, style editor, and mentor, offering 25 writing reports. It identifies repetitive language, vague words, overuse of adverbs, passive voice, and complex structures while providing a word explorer and thesaurus.

    96 ProWritingAid alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • GB flagUnited Kingdom

    Platforms

    • Mac
    • Windows
    • Online
    • Microsoft Edge
    • Google Chrome
    • Microsoft Outlook
    • Microsoft Word
    • Google Docs
    • Google Workspace
    • Mozilla Firefox
    ProWritingAid screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  Spell Checking
    2.  Automated proofreading
    3.  Grammar explanations
    4.  Grammatical Error Checking
    5.  Grammar tool
    6.  Cloning in multiple languages styles

    ProWritingAid VS Harper

     
  11. Compose icon

    Compose

     2 likes
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    Transform your writing instantly with Compose. Fix grammar, improve tone, and craft professional messages with just a keyboard shortcut, anywhere on your computer.

    52 Compose alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    Compose screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  No registration required
    2.  Ad-free
    3.  No Tracking
    4.  Support for Keyboard Shortcuts
    5.  Grammar tool
    6.  AI-Powered
    7.  Proofreading

    Compose VS Harper

     
  12. CleverType icon

    CleverType

     4 likes
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    CleverType Keyboard is an AI-powered tool utilizing ChatGPT technology, offering versatile writing options to enhance productivity and typing accuracy.

    24 CleverType alternatives

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Android
    • Google Chrome
    • iPhone
    CleverType screenshot 1

    Properties

    1.  Customizable

    Features

    1.  AI-Keyboard
    2.  Grammar tool
    3.  AI-Powered

    CleverType VS Harper

     
  13. Fixkey icon

    Fixkey

     3 likes
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    Fixkey fixes your grammar in any app using AI.

    License model

    Application types

    Platforms

    • Mac
    Fixkey screenshot 1

    Properties

    1.  Lightweight
    2.  Distraction-free

    Features

    1.  Spell Checking
    2.  Grammar tool
    3.  AI-Powered
    4.  Support for Keyboard Shortcuts
    5.  Works Offline
    6.  Ad-free
    7.  Multiple languages
    8.  Dictation
    9.  Voice dictation

    Fixkey VS Harper

     

    • Fixkey is the most popular commercial alternative to Harper.

    • Fixkey is Paid and ProprietaryHarper is Free and Open Source
    • Fixkey is LightweightHarper is not according to our users
  14. Linguix icon

    Linguix

     14 likes
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    Linguix is a software solution that enhances written communication and learning through its web application and browser extensions. It uses AI to analyze your writing across the internet, offering over 2000 corrections for grammar, spelling, and style.

    License model

    • Freemium • Proprietary

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Microsoft Edge
    • Google Chrome
    • Firefox
    Browser extension

    Linguix Features

    1.  Spell Checking
    2.  Language Detection
    3.  AI-Powered
    4.  Writing assistance

    Linguix VS Harper

     
  15. Slick Write icon

    Slick Write

     24 likes
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    Slick Write is a powerful, free tool that makes it easy to check your writing for grammar and spelling errors, potential stylistic mistakes, and other features of interest. Whether you're a blogger, novelist, or student writing an essay for school, Slick Write can help take...

    54 Slick Write alternatives

    License model

    • Free • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    Slick Write screenshot 1

    Properties

    1.  Educational

    Features

    1.  Spell Checking
    2.  Automated proofreading
    3.  Grammatical Error Checking
    4.  Proofreading
    5.  Document structure management

    Slick Write VS Harper

     
  16. Scribens icon

    Scribens

     1 like
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    A powerful, free spelling and grammar checker. Scribens corrects 250 types of grammar mistakes. English and French.

    License model

    • Freemium • Proprietary

    Application type

    Country of Origin

    • FR flagFrance
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Thunderbird
    • Microsoft Office 365
    • LibreOffice
    • Apache OpenOffice
    • Firefox
    Scribens screenshot 1

    Scribens Features

    1.  Grammar tool

    Scribens VS Harper

     

    • Scribens is the most popular Android Tablet alternative to Harper.

    • Scribens is Freemium and ProprietaryHarper is Free and Open Source
13 of 38 Harper alternatives