Lumo by Proton
Private AI chat assistant with zero-access encryption
Lumo is Proton's AI assistant for questions, writing help, and file chats, built so your conversation history stays encrypted and private. A free plan lets anyone try it, and Plus adds unlimited chats for people who want privacy-first help every day.
Available on
WebMobile
Pricing
Free $0; Lumo Plus $12.99/mo monthly or $9.99/mo billed yearly ($119.88/yr)
Free tier availablefreemium pricing
Price checked Oct 17, 2026
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