I've tried most browsers out there. Koi takes the best parts of each and fixes the bad parts.

The window is frosted glass, calm and right at home on macOS. Horizontal tabs are back, in a toolbar designed to take less of your screen and still feel roomy.

A lot of people now have an agent test their work end to end in the browser. Connecting one takes a click, and it works in its own folder while you keep browsing. Developer Mode gives web developers extra tools and easier access to the usual ones. And it's built on Firefox, so your passwords, bookmarks and extensions carry over when you sign in.

Koi has no telemetry and nothing to learn. Free for macOS.