Lumo: Proton launches free AI chat assistant with high privacy protection

Lumo is a privacy-first AI chat assistant from Proton, designed to provide users with a secure, private and intelligent conversation experience. It uses zero-access encryption to ensure that user chats are only readable on the user's device and inaccessible to Proton's servers.Lumo does not record logs of user conversations and does not use user data to train AI models. Its code is based on open-source big-language models, is transparent and verifiable, and runs in European data centers controlled by Proton. It's free to use without registering, and users can save encrypted chat logs by logging into their Proton account.Lumo also offers a paid Lumo Plus plan that unlocks unlimited chats and more advanced features. It's designed to combine the convenience of AI with privacy for data security-conscious users.

Function List

• Privacy Chat: All conversations are encrypted using zero-access encryption, decrypted only on the user's device, and cannot be viewed by Proton.
• No logging: The server does not keep any chat logs after the conversation is completed, protecting user privacy.
• open source model: Using the Nemo, OpenHands 32B, OLMo 2 32B and Mistral Small 3 and other open source large language models with open and transparent code.
• No account required: Start chatting on the web or mobile without registering for a quick and easy experience.
• File Upload and Analysis: Support for uploading files (e.g., documents) for summarization, analysis, or translation.
• Multi-language support: Supports conversations in English, French, German, Spanish, Italian, and many other languages.
• Privacy Friendly Search: Web search functionality can be enabled to access real-time information using a privacy-friendly search engine.
• Cross-device synchronization: Chat logs can be synchronized across multiple devices with zero-access encryption when logged into a Proton account.
• Lumo Plus Advanced Features: Offers unlimited chat, extended chat logs and larger file uploads.

Using Help

Getting Started with Lumo

Lumo is very easy to use and users can get started without complicated settings. Below is a detailed guide to using Lumo:

1. Visit Lumo
   • Open your browser and visit https://lumo.proton.me/You can also download the iOS/Android mobile app (search for "Lumo by Proton" in the App Store or Google Play).
   • There is no need to register an account, just type a question or instruction into the chat box on the web page and press "Enter" or click the "Send" button to start a conversation.
   • If you need to save chats or use advanced features, it is recommended to register and login to your Proton account. Once logged in, chats are saved in a zero-access encrypted format and can only be viewed by the user.
2. Core Function Operation
   • Privacy Chat
     Type any question into the chat box, such as "How to keep drinking water healthy in the summer" or "Write me an email" Lumo generates answers quickly and all conversations are protected by zero-access encryption. All conversations are protected by zero-access encryption. The server keeps no record of the chat after it ends. If you're logged into your Proton account, chats are encrypted and can be viewed on the web or mobile at any time.
     Operational Steps:
     • Type your question in the chat box and click "Send".
     • Check out Lumo's responses and continue to enter follow-up questions to continue the conversation.
     • If you need to clear the chat history, you can click the "three dots" menu in the upper right corner of the chat window on the mobile device and select "Clear History".
   • File Upload and Analysis
     Lumo supports uploading documents for analysis, such as summarizing legal documents or translating texts.
     Operational Steps:
     • Log in to your Proton account (free or Plus plan).
     • Click on the File Upload icon next to the chat box and select either Local File or Import from Proton Drive.
     • Enter commands such as "Summarize this document" or "Translate this document into French".
     • Lumo will analyze the file and return the results. Note: The Free plan has a file size limit, the Plus plan supports larger file uploads.
   • Enable privacy-friendly search
     By default, Lumo only uses built-in knowledge to answer questions. For real-time information, enable the web search function.
     Operational Steps:
     • After typing your question in the chat box, click the search switch (small icon next to the chat box for web, in settings for mobile).
     • Lumo takes the information and returns the answers through privacy-friendly search engines such as Brave Search.
     • If the search results are inaccurate, you can уточнить the question or re-enter it.
   • multilingual dialog
     Lumo supports multiple languages, so you can type your question directly in English, French, etc. and Lumo will reply in the appropriate language.
     Operational Steps:
     • Enter the question in the target language, e.g. "Comment rester hydraté en été?" (French: How to stay hydrated in summer?). .
     • Lumo automatically recognizes the language and replies without having to manually switch languages.
3. Lumo Plus Upgrade
   For unlimited chat or larger file uploads, it's recommended to upgrade to Lumo Plus ($12.99 per month or $119.88 per year).
   • Log in to your Proton account and click the "Upgrade" button on the Lumo webpage or app.
   • Select the Lumo Plus plan and complete your payment to take advantage of the premium features.
   • Plus program users can keep longer encrypted chat logs and upload multiple large files for analysis.
4. Mobile use
   • After downloading the Lumo mobile app, open the app and start chatting.
   • Mobile support for voice input: click the microphone icon next to the chat box, say the question, and Lumo will transcribe it and reply.
   • After logging in to your account, chats can be synchronized with the web side and viewed anytime, anywhere.
5. Privacy settings
   • Ghost ModeGhost Mode is supported on mobile devices. It is suitable for temporary sensitive conversations as the chat records will not be saved after it is enabled. Action: Enable "Ghost Mode" in mobile settings.
   • Clear Chat Records: You can delete local encrypted records by selecting "Clear History" on the web or mobile.

caveat

• The free version of Lumo has a limit of questions per week (about 100). For more features, we recommend upgrading to Lumo Plus.
• The file upload feature requires an account login and supports small files on the Free plan and larger files on the Plus plan.
• The web search function needs to be enabled manually, which may affect the response speed due to the network environment.

application scenario

1. Personal privacy protection
   Lumo provides a secure conversational environment when users need to handle sensitive information such as health issues or legal advice. Its zero-access encryption and no-logging policy ensure that no data is compromised. For example, type "summarize this contract" or "explain a medical report" and Lumo generates the answer, and the conversation is viewable only on the user's device.
2. Increased work efficiency
   Professionals can use Lumo to quickly summarize documents, translate files or write emails. For example, to upload a lengthy report, type "Summarize the key points of this report" and Lumo will extract the key points, saving time. Programmers can type "Write me a piece of Python code" and Lumo will generate the code and provide an explanation.
3. multilingual communication
   Multinational teams or travelers can use Lumo for multilingual communication. For example, type the question "Wie plane ich eine Reise nach Berlin?" in German and Lumo will respond with detailed itinerary suggestions in German for international users. Lumo responds with detailed itinerary suggestions in German, making it easy for international users.
4. Study and Research
   Students and researchers can use Lumo to answer academic questions or analyze information. For example, type "Explain the fundamentals of quantum mechanics" and Lumo will provide a concise explanation. For the most up-to-date information, launch a web search for real-time data.

QA

1. How does Lumo protect my privacy?
   Lumo stores chat logs using zero-access encryption that can only be decrypted by the user's device. The server does not keep logs of conversations and user data is not used to train AI models. All operations are done in European data centers controlled by Proton and are not shared with third parties.
2. Do I need to register an account to use Lumo?
   Not required. Users have direct access to https://lumo.proton.me/ or mobile app to start chatting, no registration is required. But logging into your Proton account saves encrypted chats and unlocks more features.
3. What languages does Lumo support?
   English, French, German, Spanish and Italian are currently supported, with more languages to be added in the future. Users can ask questions directly in these languages and Lumo will reply in the same language.
4. What is the difference between Lumo and ChatGPT?
   Lumo emphasizes privacy protection, does not record logs, does not use user data to train models, and uses open source models with transparent code. chatGPT may store conversation data and use it for model training, with weaker privacy protection.
5. What additional features does Lumo Plus offer?
   Lumo Plus ($12.99 per month) offers unlimited chats, extended encrypted chats, larger file uploads and multi-file analysis for high-frequency users.