Private AI chat with zero-access encryption
Lumo is Proton’s privacy-first AI assistant for chat, search, writing, and analysis. It keeps conversations encrypted so Proton says even they can’t read them.
Agenticness = how independently a tool can take action, scored across 9 dimensions. Scored independently by David Kooi, Skylark Creations — see full rubric → Last re-evaluated 21 August 2026.
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About
Lumo is a privacy-focused AI chat assistant from Proton, the company behind Proton Mail and Proton VPN. It’s aimed at individuals and businesses that want a general-purpose assistant for writing, planning, research, and light analysis without giving up control of sensitive conversations.
Lumo’s main differentiator is privacy: Proton says chats are stored with zero-access encryption, are not used to train AI models, and cannot be read by Proton. The product is also open source, which helps with transparency. That said, the site does...
Executes tasks you assign, one step at a time, within narrow domains.
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- Free: Limited Max model usage, limited messages and chat history, limited image generations, and 1 project. No credit card required.
- Lumo Plus: More Max model usage, more messages and chat history, more image generations, unlimited projects, and unlimited custom Lumos. The page says it includes a 30-day money-back guarantee, but the exact monthly price was not clearly shown in the crawled content.
When Lumo changes its pricing, we catch it the next morning
We recrawl every tool in this directory daily. AI Insider is the 3-minute brief on what actually changed — pricing, features, score moves on our 36-point rubric — often before any press coverage. Sent daily. Skipped when nothing happened.