Lumo
Lumo is an artificial intelligence assistant developed by Proton that prioritizes privacy and confidentiality of conversations. Unlike other AI tools that collect and monetize user data, Lumo uses zero-access encryption and doesn’t log conversations on servers, ensuring that only the user can access their interactions.
Lumo
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Updated: January 27, 2026
Overview
Lumo is an AI assistant created by Proton, a Swiss company recognized for its privacy services like Proton Mail and Proton VPN. The tool offers generative AI capabilities — such as document analysis, code generation, information summarization, and text rewriting — without compromising user privacy through end-to-end encryption and no-log conversation architecture.
Designed for users who value the confidentiality of their AI interactions, Lumo serves everyone from individuals concerned with digital privacy to professionals handling sensitive information, such as investigative journalists, lawyers, political activists, and companies working with confidential data.
Lumo's main differentiator lies in its privacy-first approach: no conversations are logged on Proton's servers, data is not shared with third parties nor used to train language models, and zero-access encryption ensures that only the user can decrypt and read their stored conversations.
Key Features & Functionalities
- Zero-Access Encryption: Saved conversations are end-to-end encrypted and can only be decrypted on the user's device, preventing access by third parties or even Proton itself.
- Ghost Mode: Allows conversations to disappear permanently once closed, leaving no traces on servers.
- No Conversation Logging: The tool doesn't maintain interaction logs on the server side, ensuring conversations aren't vulnerable to data leaks.
- File Upload: Capability to analyze and process documents uploaded by the user, without storing permanent records of this data.
- Proton Drive Integration: Allows connecting files from Proton Drive while maintaining end-to-end encryption throughout the entire process.
- Optional Web Search: When activated, uses privacy-focused search engines to access real-time information.
- Open Source: Based on open-source language models, allowing independent auditing and transparency about functionality and security.
- Hybrid Models: Combines Proton's proprietary models with trusted third-party models, like Mistral.ai, adapted to operate within strict privacy standards.
Use Case Examples
- Legal: Summarize sensitive legal documents or confidential contracts without risk of exposing privileged information to third parties.
- Healthcare: Ask questions about personal health matters while maintaining total confidentiality of shared medical information.
- Investigative Journalism: Analyze sources and classified documents without leaving traces that could compromise the security of sources or ongoing investigations.
- Software Development: Generate and review code for proprietary projects without having snippets or business logic used to train external models.
- Corporate Communication: Rewrite and improve sensitive professional emails with assurance that content won't be accessed or stored by third parties.
- Activism and Human Rights: Consult and obtain AI assistance in sensitive political contexts where privacy and data protection are critical for personal safety.
How to Use
- Access the Platform: Visit the official website or download the app available for Android and iOS devices.
- Start Conversation: Begin interacting immediately without needing to create an account, or log in with an existing Proton account to save conversation history with encryption.
- Ask Questions or Make Requests: Type your queries, analysis requests, content generation, or other tasks you want to accomplish with AI assistance.
- Upload Files (Optional): Upload documents that need analysis or processing, maintaining data privacy.
- Activate Additional Features: Enable functionalities like web search for updated information or ghost mode for temporary conversations without logging.
- Manage History: If logged in, access previous conversations on any device, all protected by zero-access encryption that only you can decrypt.
Required Expertise Level
Lumo is designed to be accessible to users of all technical knowledge levels. The interface is intuitive and similar to other popular AI assistants, allowing beginners to ask questions in natural language without needing complex configurations. Intermediate and advanced users can leverage additional features like Proton Drive integration, encrypted history management, and advanced privacy settings like ghost mode, but even these features are implemented in a straightforward and accessible manner.
Available Integrations
- Proton Drive: Native integration that allows connecting and analyzing files stored in Proton Drive while maintaining end-to-end encryption.
- Proton Account: Synchronization of encrypted conversation history across devices when logged in with a Proton account.
Plans & Subscription Models
- Free: Basic access without needing an account, allowing tool usage with limitations on conversation quantity and file upload features.
- Lumo Plus: Paid plan offering unlimited conversations, extended chat history, ability to save more favorites, and support for larger or multiple file uploads.
- Proton Visionary Plan: Access to Lumo Plus is included for Proton's premium plan subscribers, adding value to the complete service ecosystem.
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