BYOK Grammar Checker for Chrome

LexiLint lets you connect a supported AI provider with your own API key. The extension sends a grammar-check request directly to the provider you select; Ignite App does not receive or store the page text. Gemini is available in the free LexiLint tier, while Premium adds OpenAI and Anthropic support.

🤖 New: LexiLint for AI Assistants

Use LexiLint's spell and grammar checking directly in Claude Desktop, ChatGPT, Cursor, and other AI assistants via the Model Context Protocol (MCP).

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What Does BYOK Mean?

BYOK means Bring Your Own API Key. You choose a supported AI provider, create an API key with that provider, and add the key to LexiLint.

When you start a grammar check, the request goes from the extension to the provider you selected. Ignite App does not receive or store the page text. The provider's privacy policy, retention rules, availability, and charges still apply.

Supported AI Providers

Google Gemini

Free LexiLint tier

Connect a Gemini API key from Google AI Studio. Google controls regional availability, API limits, retention, and billing requirements.

OpenAI

LexiLint Premium

Connect an OpenAI API key. OpenAI API charges and terms apply separately.

Anthropic

LexiLint Premium

Connect an Anthropic API key. Anthropic API charges and terms apply separately.

How to Set Up BYOK in LexiLint

  1. 1
    Install LexiLint from the Chrome Web Store.
  2. 2
    Create a Gemini API key at Google AI Studio. Check Google's current regional availability, limits, and billing requirements.
  3. 3
    Open LexiLint settings and paste the provider key.
  4. 4
    Run Check Grammar (AI) on a supported page. The extension sends selected text directly to the configured provider.

LexiLint BYOK Support

Capability Free LexiLint tier LexiLint Premium
Offline spell checking US and UK English variants Plus six additional languages
Gemini BYOK grammar Included Included
OpenAI BYOK grammar Not included Included
Anthropic BYOK grammar Not included Included

Provider accounts, API access, usage limits, and charges are separate from LexiLint. For a broader product comparison, see LexiLint vs Grammarly.

Frequently Asked Questions

  • What does BYOK mean?
    Bring Your Own API Key means you configure a supported provider key in LexiLint. Grammar-check requests go directly from the extension to that provider.
  • Is Gemini API access always free?
    Google currently offers free-tier access in eligible regions, subject to its limits and terms. Check Google AI Studio for current availability and billing requirements.
  • Does Ignite App receive my page text?
    No. LexiLint does not send page text to Ignite App. Spell checking stays on the device; optional grammar goes directly to the provider configured by the user.
  • Where can I run a BYOK grammar check?
    LexiLint is designed for live, staging, and localhost pages that Chrome allows the extension to access. Browser-protected pages and pages that block extension access may not be available.

Grammar Checking on Your Terms

Your own API key. Your chosen provider. Your text never leaves your control. Install free — spell checking works instantly, no API key needed.

Add to Chrome — Free