Lumo

Lumo is Proton's privacy-first AI assistant built for users who refuse to trade confidentiality for convenience. Conversations stay encrypted and confidential, with no training on user data, no advertising profiles, and no tracking. Lumo delivers general-purpose chat, writing, research, and coding help inside the Proton ecosystem already trusted by millions for email, VPN, and cloud storage.

Built on open-source language models and run on European infrastructure, Lumo encrypts every chat so that even Proton cannot read user conversations. Sessions can be fully ephemeral, with no long-term storage by default, and the assistant integrates with Proton Mail, Drive, and Calendar so users keep one zero-access identity across every Proton service.

Key benefits:

• Zero-access encryption keeps conversations private from Proton and third parties
• No training on your data so questions never feed external AI models
• Ephemeral chats leave no persistent record unless the user opts in
• Open-source models running on Proton-operated European servers
• Proton ecosystem integrates neatly with Mail, Drive, and Calendar
• No ads, no profiling consistent with Proton's long-standing privacy mission

Lumo is operated by Proton AG, headquartered in Geneva, Switzerland, and runs on Proton's own European data centers under strict Swiss privacy law and GDPR. Proton is ISO 27001 certified and independently audited, offering a sovereign alternative to US-owned chatbots for EU businesses and privacy-sensitive individuals.

Ideal for journalists, lawyers, healthcare professionals, and privacy-conscious users who need a capable AI assistant without surveillance baggage.