sync day for ChatGPT

io.github.syncday-app/sync-day

Free no-signup group scheduling; share a link and rank times by who's free.

client:ChatGPT transport:streamable-http tools:8

Install sync day in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://sync.day/mcp/mcp

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