Howler: open-source macOS app for AI questions that burn after reading

Howler is the work of a Chinese developer going by Aries Zhou, who said he built it for Harry Potter fans after often wanting to look up a concept on the fly without switching to a browser or opening a separate chat session. The app draws its name from the screaming letters in the Harry Potter series that burst into flames after delivering their message, and it renders each query as a parchment letter sealed with wax that shows a letter for the chosen model.

The privacy design is central to the pitch. According to Howler's website, the app stores messages only in memory, sends requests directly to the chosen AI service rather than through a relay, and keeps no logs; the only outside connection is an update check that can be disabled. Zhou noted that the app does not take up a conversation list and requires no cleanup or archiving afterward, positioning it for sudden questions rather than ongoing chats. He also cautioned that users should not assume the AI provider will not retain a record of the exchange.