Chorus

Chorus opens several AI chat websites in one window, signed in with your own accounts. A prompt goes to every panel at once and the answers sit next to each other. You can add an OpenAI-compatible API model that reads all the replies and points out where they agree and disagree, and type @ to send a follow-up to a single panel. The panels work the way a browser does, so they need no API key.

It suits people who compare answers from different assistants and do not want a row of browser tabs open for them.

Requires macOS 13 or later; the release is universal (Apple silicon and Intel). The DMG is not notarized, so the first launch has to be allowed in System Settings or cleared with xattr. The chat panels depend on each site's own page, so a redesign can break sending until Chorus is updated. The one-click comparison uses an API you configure, and that provider charges for the usage.