PlainGrade

Overview

PlainGrade is an MCP server that analyzes English text readability using industry-standard metrics including Flesch, Flesch-Kincaid, Fog, and SMOG scores, along with detailed text statistics. The service prioritizes privacy—text is never stored, making it safe for sensitive content analysis.

PlainGrade runs as a remote hosted service accessible at https://plaingrade-api.mike-tusa.workers.dev/mcp. Authentication requires an API key. The latest release is v0.4.0, available from the vendor website at https://plaingrade-api.mike-tusa.workers.dev/. No local installation is needed; simply configure your MCP client with the endpoint.

PlainGrade is listed in the Development category on mcp.site and works with Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and other MCP clients. If you maintain PlainGrade, claim this listing to verify ownership and keep information current.

Installation

Settings → Connectors → Add custom connector
Name: PlainGrade
URL:  https://plaingrade-api.mike-tusa.workers.dev/mcp