PlainGrade for ChatGPT

dev.workers.mike-tusa.plaingrade-api/plaingrade-api

English readability scores (Flesch, Flesch-Kincaid, Fog, SMOG) and text stats. Text never stored.

client:ChatGPT transport:streamable-http tools:1

Install PlainGrade in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://plaingrade-api.mike-tusa.workers.dev/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs