Mimir v0.1.3

Installers for macOS (Apple silicon), Windows and Linux. The Mac app is signed and notarized by Apple. The Windows installer isn't code-signed yet: choose More info, then Run anyway the first time. How to use Mimir: https://heymimir.app/docs/

New in 0.1.3: Export and Copy work in the desktop app; switching chats or bots never shows the one before; buttons that fail say why. Details: https://github.com/currentbits/mimir/blob/master/CHANGELOG.md