When signing into an account, there’s a field labelled username or email. But it only accepts your short username (eg. PocketGoblin).

If you use your email address Arctic pretends to be signed in but gives ephemeral error messages and doesn’t work. If you use your full username (eg. PocketGoblin@slrpnk.net) it’ll give you a misleading error and prevent you from signing in.

Clicking the website links in Settings > About also causes the app to crash. And while typing this I encountered a bug twice where the keyboard disappeared and I couldn’t type anymore, forcing me to cancel the post. The ability to save drafts would be a great feature.