The company behind Proton VPN, Proton Mail and Proton Pass, has released an open-source AI chatbot that it says isn't trained on user data.

The company behind Proton Mail has announced a new AI chatbot that promises encrypted chats which are stored locally on-device.

Unlike ChatGPT and Gemini, Proton says conversations with Lumo are completely confidential. Chats are end-to-end encrypted, not stored on Proton’s servers and never used to train AI models, meaning the company can’t access them, share them or learn from them.