Lumo

Lumo

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Private AI assistant with zero-access encrypted chats.

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Overview

Lumo is Proton’s AI assistant for asking questions, creating and organizing information, analyzing data, and generating images. Chats are stored with zero-access encryption, and Proton says conversations are not used to train AI models.

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Updated Aug 31, 2026.

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Recommends this toolAug 31, 2026
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Key Features

Pros

Saved chats use zero-access encryption.
Conversations are not used to train AI models.
Available on the web, iOS, and Android.

Cons

The free plan limits model usage, messages, chat history, image generation, and Projects.
Some features require a Proton account.
The advertised $9.99 monthly price is billed annually.

Pricing

Lumo pricing plans
Plan	Price	Highlights
Lumo Free	Free	Limited model usage Limited messages and history Limited image generations 1 Project
Lumo Plus	$9.99 month, billed annually	Expanded model usage More messages and history More image generations Unlimited Projects and Custom Lumos

Pricing is collected from the official Lumo website and may change. Always confirm with the vendor.

Frequently Asked Questions