I've always found existing time zone converters (like World Time Buddy) to be a bit cluttered and grid-heavy.

I built Zoneless.tools to be a cleaner alternative.

What it does:

Stacks cities as horizontal timelines so you can see the day/night flow.

Highlights the "Overlap" (Business Hours) across all selected cities.

Generates a copy-pasteable message for Slack/Email with the converted times.

No Login / No Database: It stores the city selection in the URL, so you can just bookmark the link or share it with a coworker and they see the exact same view.

It's free and focused on privacy (no tracking). Hope it's useful!