Compare the Top On-Premises Grammar Checkers as of July 2025

What are On-Premises Grammar Checkers?

Grammar checkers are software tools that help users improve the quality of their writing by identifying and suggesting corrections for grammatical errors, spelling mistakes, punctuation issues, and sentence structure problems. These tools analyze text in real time, offering suggestions for improving clarity, style, and tone. Grammar checkers are widely used by writers, students, professionals, and anyone who needs to produce error-free content. Advanced grammar checkers often include features like plagiarism detection, vocabulary enhancement, and context-based writing suggestions to further refine the text. Compare and read user reviews of the best On-Premises Grammar Checkers currently available using the table below. This list is updated regularly.

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    Trinka AI

    Trinka AI

    Trinka AI

    Trinka AI is a privacy-focused grammar checker and writing assistant designed for academic and technical writing. Created by language and science experts, it detects and corrects various intricate writing errors such as contextual spelling mistakes and advanced grammar issues. Additionally, Trinka suggests improved vocabulary choices and offers real-time writing tips to help professionals and academics write clearly, formally, and engagingly. By adapting to different subjects, Trinka ensures that its corrections align with the specific nuances of each topic, maintaining high professional standards in writing.
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    Starting Price: $6.67/user/month
  • 2
    ProWritingAid

    ProWritingAid

    Orpheus Technology

    Companies using ProWritingAid produce higher quality content, comms, reports, bids and other documents with fewer mistakes, faster. ProWritingAid eliminates common error types, inconsistent terminology, contextual spelling errors, grammar mistakes, and poor writing style. A wide range of integration options, including API and on-premise solutions, supports all sizes of organization, including those with high-level security and privacy requirements.
    Starting Price: $79.00/year/user
  • 3
    WProofreader

    WProofreader

    WebSpellChecker

    WProofreader Software Development Kit (SDK) by WebSpellChecker is a combo of ready-made integrations for WYSIWYG editors and standalone API, helping development teams enrich web apps and custom systems with grammar and spelling check functionality and standalone HTTP API. WProofreader integrates with WYSIWYG editors and HTML controls. Cloud and On-premise deployment. Ideal for security-conscious teams and companies. Key features: high security, multilingual spelling and grammar-check, language autodetect, spelling autocorrect, autocomplete suggestions, integration with business infrastructure or app, company-wide and user dictionaries, customization options, accessibility. Available as a browser extension for Chrome, Firefox, and Microsoft Editor. WProofreader extension works with various online software: project management apps publishing platforms social platforms email service document management content management CRM systems service desk systems
  • 4
    Sapling AI Writing Assistant

    Sapling AI Writing Assistant

    Sapling Intelligence

    AI writing assistant for customer-facing teams. Sapling sits on top of CRMs and messaging platforms to help agents more efficiently compose personalized responses. Managers gain conversational insights to coach and prepare teams. Sapling provides functionality for autocomplete, spelling and grammar checking as well as snippets/canned messages/text expander. All services can be self-hosted, provided on-premise or cloud-premise to meet enterprise security and privacy requirements. Spelling and Grammar checking APIs allow users to integrate Sapling's language models into custom applications and use cases. Sapling Suggest retrieves relevant responses from a team knowledge bank and allows agents to respond more quickly to customer inquiries by simply clicking on the desired response. Empower agents instead of providing brittle, decision tree-based chatbots.
    Starting Price: $25 per month
  • 5
    TextGears

    TextGears

    TextGears

    TextGears provides AI-empowered text spelling and grammar checking, paraphrasing and translation services. Available online. For companies, we provide an API and on-premise for integrating text analysis functions into any product. Supported languages: English, French, German, Portuguese, Russian, Italian, Arabic, Spanish, Japanese, Chinese and Greek.
    Starting Price: $4.90
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