CountLink for ChatGPT

app.countlink/countdown

Shared countdown timers that stay in sync on every screen — no account, any number of viewers.

client:ChatGPT transport:streamable-http tools:4

Install CountLink in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://countlink.app/mcp

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