Overview

• Users can access Lumo immediately via web and iOS/Android apps with a free tier for basic encrypted chats or a $12.99-per-month Lumo Plus plan for unlimited conversations, extended history, and larger file uploads.
• All conversations are secured by zero-access encryption that grants only users the decryption key, preventing Proton or any third party from accessing chat content.
• The assistant operates on open-source large language models hosted in Proton’s European data centers, avoiding reliance on U.S. or Chinese AI providers.
• An optional privacy-friendly web search is disabled by default, and users can upload or link Proton Drive files for analysis without any data retention.
• Proton positions Lumo as a privacy-centric alternative to mainstream AI assistants from companies like OpenAI, Google, Meta, and Microsoft.