Microsoft Editor

Best Self Hosted Alternatives to Microsoft Editor

A curated collection of the 2 best self hosted alternatives to Microsoft Editor.

AI-powered writing assistant integrated into Microsoft 365 and available as a browser extension. It detects spelling, grammar, clarity and style issues, offers rewrite and tone suggestions, and applies context-aware corrections across Word, Outlook and web apps.

Alternatives List

#1
LanguageTool

LanguageTool

Open-source proofreading and writing assistant that checks spelling, grammar, punctuation, and style across 30+ languages, with an HTTP API for integrations.

LanguageTool is an open-source proofreading and writing assistant that detects spelling, grammar, punctuation, and style issues in many languages. It can be used through its editor and integrations, and it can also be run as a server for programmatic checking.

Key Features

  • Checks grammar, spelling, punctuation, casing, and style issues beyond basic spellcheck
  • Supports 30+ languages and dialects with automatic language detection
  • HTTP server mode with a REST API for integrating into apps and workflows
  • “Picky”/more advanced rule checking for stricter style and typography suggestions
  • Custom dictionaries and the ability to add words and exceptions
  • Rule-based NLP approach with extensible language-specific rules

Use Cases

  • Self-hosted text checking API for internal tools, CMSes, or document pipelines
  • Quality control for multilingual content teams and editorial workflows
  • Integrations in enterprise environments where text must remain on controlled infrastructure

Limitations and Considerations

  • Many advanced suggestions and some AI-based capabilities are tied to proprietary/hosted offerings rather than the open-source core
  • Accuracy and coverage can vary by language depending on available rules and maintainership

LanguageTool is a strong option for organizations and individuals who need a privacy-friendly, multilingual grammar and style checker. Its server mode and API make it especially useful when you want to integrate proofreading into products or internal systems.

14kstars
1.5kforks
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#2
OmniPoly

OmniPoly

Web frontend that combines LibreTranslate translation and LanguageTool grammar checks, with optional Ollama LLM features for AI insights, file upload, and downloads.

OmniPoly is a web frontend that centralizes translation and language-enhancement workflows. It integrates translation and grammar-checking backends and can optionally use LLMs to provide AI-driven insights and sentence extraction.

Key Features

  • Text translation across multiple languages using an external translation backend
  • Grammar and style checking via an external LanguageTool instance
  • Optional LLM-powered analysis (Ollama) for sentiment, interesting-sentence extraction, and text modification
  • File upload for batch translation and download of translated results
  • Add words to a user dictionary for grammar checks and configurable language filters
  • Docker and Docker Compose support with environment-variable configuration; UI hides features when their backend is not configured

Use Cases

  • Translate and proofread emails, documents, or short texts while preserving grammar and style
  • Extract and highlight interesting sentences or sentiment from translated text using an LLM
  • Build a lightweight internal tool to unify translation, grammar checking, and simple AI text transformations

Limitations and Considerations

  • OmniPoly is a frontend and requires external instances of LibreTranslate, LanguageTool, and/or Ollama to enable corresponding features
  • Some features are only available when respective backend services and API keys are provided via environment variables

OmniPoly is suited for teams or individuals who want a single interface for translation and language quality workflows and who can provide the required backend services. It emphasizes configurable integrations and simple deployment via Docker.

100stars
5forks
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Why choose an open source alternative?

  • •Data ownership: Keep your data on your own servers
  • •No vendor lock-in: Freedom to switch or modify at any time
  • •Cost savings: Reduce or eliminate subscription fees
  • •Transparency: Audit the code and know exactly what's running