Automattic's Harper delivers offline Rust grammar checking

// 6h agoOPENSOURCE RELEASE

Automattic's Harper delivers offline Rust grammar checking

Harper is an open-source, offline grammar checker developed in Rust and backed by Automattic as a private alternative to cloud tools like Grammarly. Operating deterministically on-device without sending text to external servers, it integrates with popular editors including VS Code, Neovim, Obsidian, and Zed for low-latency spell checking.

// ANALYSIS

Cloud-bound grammar checkers compromise user privacy and introduce latency by sending every keystroke across the network. Harper demonstrates that a fast, rule-based engine written in Rust can deliver superior local grammar checking without the bloat, privacy risks, or latency of server-side LLMs.

–Local-first architecture keeps all text processing on-device to ensure total user privacy.
–Built in Rust for blazing speed, low CPU consumption, and instant feedback while typing.
–Wide ecosystem support spanning VS Code, Neovim, Obsidian, and Zed editor integrations.
–Deterministic rule-based engine provides reliable grammar and spell checking without cloud dependencies.

// TAGS

rustgrammar-checkerprivacyopen-sourceautomatticdevtool

DISCOVERED

6h ago

2026-07-23

PUBLISHED

6h ago

2026-07-23

RELEVANCE

8/ 10

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