Lumo is a privacy-focused AI assistant created by Proton, the Swiss company behind encrypted email and VPN services trusted by over 100M people. Launched in July 2025, Lumo uses zero-access encryption so no conversations are logged on Proton’s servers, and saved chats can only be decrypted on your device. The service is free at lumo.proton.me and available on iOS and Android, handling conversation, coding, file analysis, email rewriting, and research with the same capabilities as mainstream AI assistants. Ghost Mode permanently deletes conversations when you close the chat for added privacy control. Lumo runs on open-source models and operates from European data centers under Proton’s control, keeping your data outside U.S. jurisdiction. It’s a genuine alternative to data-harvesting AI systems, offering powerful AI without surveillance
Lumo resources
Here are various resources to learn more about how to use this tool, understand its capabilities better, and get ideas for different ways to use it
