LexiLint

Grammar checkers have traditionally demanded accounts, monthly fees, and access to every keystroke. LexiLint inverts this model entirely. The tool carries out spelling and grammar corrections in the browser without storing text on any server, eliminating the privacy tradeoff users have long tolerated from competing services.

The product targets writers and content creators who publish online and want to catch errors before readers do. It also appeals to AI users who recognize that grammar checking consumes unnecessary tokens when offloaded to a separate, local tool. The privacy-conscious find value in its core architecture, which processes text locally and never logs activity.

What distinguishes LexiLint is its reliance on bring-your-own-key economics. Spell checking runs entirely offline using local dictionaries plus optional custom entries for technical terms or brand names. Grammar checking requires an AI provider, but users supply their own API credentials to services like Google Gemini, OpenAI, or Claude, keeping all text under their control. This approach sidesteps the data monetization model that fuels free grammar tools elsewhere.

The feature set covers practical needs. Offline spell checking works on any webpage using curated English dictionaries. An AI grammar mode handles style, clarity, and punctuation deterministically, so the same page yields the same corrections each time. The tool supports eight languages including Spanish, French, German, Polish, Russian, and Turkish, with spell checking across all and grammar checking available in each. Users interact through a Chrome extension or tap it within AI assistants via the Model Context Protocol, enabling grammar checks inside Claude Desktop, ChatGPT, and Cursor without consuming AI tokens.

The pricing structure is transparent. Spell checking costs nothing. Grammar checking through AI providers is free for users who hold Gemini API keys and charged at standard rates for OpenAI or Claude. No hidden subscriptions or per-check fees exist, and setup requires no account creation.

LexiLint fills a niche for users who want reliability and privacy from their grammar tools. It trades the convenience of a single account for control of API keys themselves—a reasonable swap for those skeptical of platforms that monetize user text. The offline spell checking alone justifies installation for anyone tired of revealing their drafts to third parties.