Used Lumo AI for a week instead of ChatGPT. Here's what I learned

Proton’s privacy-focused AI assistant, Lumo, launched in July 2025 and has since been renamed Lumo AI, now at version 2.0. In a week-long try instead of ChatGPT, the reviewer highlights what the product does differently: Lumo AI is described as a “zero-access encrypted” assistant that doesn’t log chats or train on user data. The user interface is familiar, with a “ghost mode,” and there’s a free tier plus Lumo Plus at $9.99 per month. The assistant can show reasoning and web sources, while memory is off by default and can be enabled in settings.