Proton launches Lumo 1.2 with dark mode, custom writing styles & new standalone plus sub

Proton has released version 1.2 of its privacy-focused AI assistant, Lumo, bringing two highly requested features—dark mode and customizable writing styles for chats. Users can now switch between light and dark themes, aligning Lumo’s appearance with other Proton offerings.

The update also keeps Proton Drive integration, letting users attach or remove documents and PDFs from Lumo’s working memory to provide better context and accuracy. It builds on the reasoning and knowledge upgrades introduced in version 1.1, improving both everyday and professional use. All personalization features remain protected by zero-access encryption, ensuring no chat logs are stored or used for training.

The new features are free for all Lumo users, but Proton now offers Lumo Plus as a standalone subscription or optional add-on, unlocking faster responses, expanded working memory, and unlimited chat usage, all without bundling it with existing Unlimited, Family, or Duo plans.