Proton Unveils Lumo AI Assistant: Fully Encrypted, No Data Logging, European-Hosted AI for Ultimate Privacy
Do Son 
Swiss technology company Proton, renowned for its end-to-end encrypted email services, has recently introduced Lumo AI Assistant, an artificial intelligence tool that pledges full encryption of user data and guarantees that no user information will be utilized for training AI models.
According to Proton, the motivation behind developing Lumo AI stems from a growing concern: mainstream AI tools often rely on harvesting user data to refine their models. In contrast, Lumo AI is designed with privacy at its core, ensuring that sensitive user information remains fully protected and never exposed.
The assistant is built upon open-source models, namely the NeMo model developed by French AI firm Mistral AI, and Nvidia’s OpenHands model. All processing takes place within European data centers, reinforcing Proton’s commitment to data sovereignty and privacy.
In terms of functionality, Lumo AI Assistant offers capabilities similar to conventional AI tools—it can answer queries, perform document analysis, rewrite emails, generate code, and more. Crucially, Proton does not retain any Lumo AI chat records on its servers. Locally stored conversations are protected with end-to-end encryption, ensuring that only the user can access the content—Proton itself, or any other entity, cannot decrypt or view the data.
To further strengthen privacy, Lumo AI Assistant includes a “Ghost Mode,” akin to incognito browsing. Conversations initiated within Ghost Mode are permanently erased upon exit and do not appear in the user’s local history.
As for availability, Lumo AI is accessible in a free version via lumo.proton.me, without requiring account registration or login. Registered users, however, gain access to synchronized chat histories. A premium tier, Lumo Plus, is available for $12.99 per month, offering unlimited chat interactions and file uploads.
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