Nittei-san

Most shareable scheduling calendars expect every participant to sign up, but Nittei-san skips that: people enter their availability on a shared page without registering or logging in.

Nittei-san is a shareable calendar tool for collaborative scheduling that helps a group settle on meeting times and events from a single page.

You create a calendar and send out its URL.

Anyone with the link opens it and marks when they are free directly on the calendar, so you do not have to chase replies through email threads or chat messages.

The link can go to people anywhere, including outside your company.

If you want more context while planning, you can log in with Google.

Your existing calendar events then show up inside Nittei-san, which makes it easier to see which slots are actually open before you mark them.

Logging in is optional, and guests who only need to answer a scheduling request can do it in a few clicks.

As an AI scheduling tool, Nittei-san fits one-off meetings with mixed groups best.