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Automattic avatar

Automattic/harper

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Harper

Harper is a local English linter and grammar checker designed as an IDE writing assistant. It operates as a language server that provides real-time spelling and grammar analysis for markdown and code comments, processing all linguistic data on the local device to ensure privacy and eliminate cloud dependencies.

The tool is specialized for technical documentation, featuring the ability to identify and ignore text within code fences and inline blocks to prevent false positives. It allows for personalized configuration through custom dictionaries and the use of suppression comments to exclude specific text regions from analysis.

The system provides actionable diagnostic mapping that enables quick-fix error resolution and grammar fix applications directly within a text editor.

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Features

  • Writing Assistance Tools - Provides real-time linguistic suggestions and quick-fix actions directly within a text editor via a language server.
  • Grammar Checkers - Provides a local language server for real-time spelling and grammar linting within editors.
  • Text Correction - Enables the correction of identified linguistic errors directly within the text editor using actionable suggestions.
  • Local Grammar Checkers - Analyzes text for spelling and grammar errors on a local device to ensure data privacy and eliminate cloud dependencies.
  • LSP Integration - Communicates with a language server protocol to identify grammar and spelling errors and return diagnostic data.
  • Spelling and Error Correction - Provides mechanisms to correct spelling or grammar mistakes and add unknown words to custom dictionaries.
  • Prose Linters - Validates writing quality in technical documents and markdown while specifically ignoring code fences.
  • Local Grammar Analyzers - Analyzes text for grammatical errors using a local engine to ensure data privacy during the linting process.
  • Custom Dictionaries - Maintains a local store of user-approved words to override default spelling and grammar rules.
  • Local-First Privacy Tools - Processes linguistic analysis on the user device to ensure data privacy and eliminate dependencies on cloud services.
  • Content Linting Pipelines - Checks grammar and spelling within markdown files and code comments to improve the quality of technical documentation.
  • Documentation Prose Filtering - Automatically skips analysis of text within code fences and inline blocks to prevent false positives in technical documentation.
  • Prose Block Detection - Identifies and excludes text within markdown code fences and inline blocks to prevent false positive linting.
  • Linguistic Analysis Exclusions - Disables grammar checking for selected sections of text through the use of specific comments within the document.
  • Diagnostic Offset Mappings - Maps language server errors to specific text offsets to provide direct inline fixes and suggestions.
  • Analysis Suppression Mechanisms - Allows users to skip specific blocks of text using ignore keywords to prevent unwanted error flags in the editor.
  • Real-time Text Linting - Provides grammar and spelling checks within supported editors via a language server to ensure high writing quality.
  • Prose Polishing Tools - Cleans up prose in technical files while ignoring code blocks and specific sections to prevent false positives.
  • Analysis Suppression Markers - Parses the document for specific ignore markers to skip analysis of designated text regions.
10,890 stars·370 forks·Rust·Apache-2.0·38 views

Star history

Star history chart for automattic/harperStar history chart for automattic/harper

How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

Projects sharing features with Harper

These projects share indexed features with Harper. Shared tags can include platform or build tooling; verify the primary use case before treating a result as a replacement.
  • vale-cli/valevale-cli avatar

    vale-cli/vale

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    Vale is a markup-aware prose linter and command-line interface tool designed to enforce editorial style guides and grammar rules across various document formats. It functions as a YAML-based style guide engine that analyzes text for consistency in tone, spelling, and terminology while ignoring non-prose elements like code blocks. The project distinguishes itself through a flexible extensibility model that allows users to define custom linting rules using YAML configurations, regular expressions, and external scripts for complex validation logic. It supports a wide array of documentation forma

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  • pbek/qownnotespbek avatar

    pbek/QOwnNotes

    5,792View on GitHub↗

    QOwnNotes is a desktop note editor that stores each note as a plain-text Markdown file on the local filesystem, avoiding proprietary formats and enabling direct file access. It functions as a Nextcloud Notes client, syncing notes and metadata with Nextcloud or ownCloud servers through a companion API service for versioning and sharing. The application also integrates with AI providers and exposes a local MCP server for external agents to search and fetch notes, and includes a companion browser extension for capturing web content, bookmarks, and screenshots. The editor distinguishes itself thr

    C++
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  • hankcs/hanlphankcs avatar

    hankcs/HanLP

    36,413View on GitHub↗

    HanLP is a natural language processing library and deep learning framework specifically optimized for the Chinese language, while also functioning as a multilingual text processor. It serves as a toolkit for performing linguistic analysis, semantic understanding, and script conversion. The project distinguishes itself through a dedicated focus on Chinese linguistic structures, including a specialized script converter for transforming text between Simplified Chinese, Traditional Chinese, and Pinyin. It further supports domain-specific model training to improve the recognition of professional t

    Pythondependency-parserhanlpnamed-entity-recognition
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  • amperser/proselintamperser avatar

    amperser/proselint

    4,542View on GitHub↗

    Proselint is a prose linter and rule-based text analyzer designed to identify stylistic errors, clichés, and jargon in written text. It scans documents against a curated registry of linguistic and typographic rules to maintain professional editorial standards and improve writing quality. The project functions as a command line text processor, a programmable analysis library, and a git pre-commit hook. Its modular architecture allows the core engine to be embedded into other applications, exposed via a REST API, or integrated into text editors. The tool supports recursive directory traversal

    JavaScript
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Compare all 30 related projects→

Frequently asked questions

What does automattic/harper do?

Harper is a local English linter and grammar checker designed as an IDE writing assistant. It operates as a language server that provides real-time spelling and grammar analysis for markdown and code comments, processing all linguistic data on the local device to ensure privacy and eliminate cloud dependencies.

What are the main features of automattic/harper?

The main features of automattic/harper are: Writing Assistance Tools, Grammar Checkers, Text Correction, Local Grammar Checkers, LSP Integration, Spelling and Error Correction, Prose Linters, Local Grammar Analyzers.

Which projects share features with automattic/harper?

Projects with overlapping indexed features include: vale-cli/vale — Vale is a markup-aware prose linter and command-line interface tool designed to enforce editorial style guides and… pbek/qownnotes — QOwnNotes is a desktop note editor that stores each note as a plain-text Markdown file on the local filesystem,… hankcs/hanlp — HanLP is a natural language processing library and deep learning framework specifically optimized for the Chinese… w0rp/ale — Ale is a Neovim LSP client and asynchronous linter wrapper designed to integrate language servers and syntax checkers… amperser/proselint — Proselint is a prose linter and rule-based text analyzer designed to identify stylistic errors, clichés, and jargon in… screenpipe/screenpipe — Screenpipe is a local-first platform designed to record, index, and analyze desktop activity. By capturing screen,…