Powerful AI that helps you learn, work, and, create effectively — without logging your data. Built by Proton, trusted by 100M+ people.
Lumo is a zero-access encrypted AI assistant that keeps every conversation private. Your data is never logged, shared, or used to train models. Your chats are yours, and yours alone.
Built by Proton, the privacy brand trusted by over 100 million people and the team behind Proton Mail, VPN, Drive, and Pass.
THOUGHTFUL HELP FOR ANY TASK
Lumo handles everything from quick questions to more complex work. Choose Fast for quick answers or Thinking for multi-step reasoning.
FAST, POWERFUL WEB SEARCH
Get precise, real-time answers in seconds. Lumo cites live sources so you can verify facts, dig deeper, and stay current on news, events, financial data, and more.
CREATE AND REFINE IMAGES AND FILES
Work with images and files just by telling Lumo what you need, from generating and editing images to analyzing documents. Connect your Proton Drive account for seamless access to stored files.
AI THAT EVOLVES OVER TIME
Lumo gets better every time you use it. Memory retains context and preferences across sessions, and you can set tones and styles to get the exact Lumo experience you want.
STAY PRODUCTIVE AND ORGANIZED
Projects give you dedicated encrypted spaces for tasks that span multiple chats, files, and instructions, while Custom Lumos let you create assistants tailored for specific tasks. Switch between light and dark modes for a more comfortable experience throughout the day.
GHOST MODE
For conversations where you want maximum privacy, choose Ghost Mode. Chats are instantly deleted once you close them for greater peace of mind.
PRIVACY YOU CAN VERIFY
Lumo is founded on zero-access encryption with no server-side chat logs, and never uses your data for profit or model training. Like all Proton products, Lumo is built and hosted in Europe and is fully open-source.
Lumo helps you stay productive, curious, and informed — without ever compromising your privacy. Start a confidential chat for free today.
For more information, visit our website: https://lumo.proton.me/about
Terms of service: https://lumo.proton.me/legal/terms
Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Our open-source code base: https://github.com/ProtonLumo/ios-lumo
Lumo is a solid 4/5. I’ve asked questions about numerous topics and it is pretty good, but not the best. I prefer Lumo for the privacy aspect, but you need to make sure that web search is on and specifically ask it to give answers with up-to-date information through web search. One chat was clearly based on outdated information, as it was giving answers that I knew were incorrect. I asked why and I pointed out I have web search on. It then told me that it decides when the chat begins whether it uses web search or not. (I’m not sure if this has been fixed or if it’s known to be an issue.) Make sure that you ask it if web search is enabled prior to any conversations. The latest training is from April 2024, so if you have questions about a person or situation that has changed since then, you will get wildly different answers with old and new information. One time it fact checked me over a person’s recent death, stating that the person was alive when they aren’t. Like with any AI, it’s a good tool, but ask clarifying questions and ask for updated information, especially if you have a question that is relevant to today. Any AI is only as good as the questions asked and its programming.
Developer Response
Thank you for your feedback. As with any AI, Lumo can sometimes hallucinate and make mistakes. Make sure to use the thumbs down button to share your input with us regarding any inadequate responses. Our team is looking into these reports in order to further improve the quality of the answers in the future.Having the above in mind, the web search feature can only be enabled by the user. It doesn't turn on by itself.
A Good Start (UPDATE)
Anr0th
UPDATE: Proton launched features as promised and directly addressed 2 of my 5 issues. Images are on the roadmap as well. Proton Doc files say they’re coming soon. That just leaves the hallucination problem, which is still prevalent. That being said, Lumo now fulfills most of my needs and, as promised in my original review, I have switched to Lumo Plus. Review changed to 4 stars. Will update again when images are added and/or when hallucinations are addressed. Thoroughly impressed with Proton’s work here!My issues with Lumo are exclusively feature parity. I use ChatGPT quite heavily, and am looking for an alternative option due to recent updates to it. I don’t expect an exact 1:1, but there are some things that, if included, would cause me to swap over to Lumo as my primary assistant:1. Dark mode. Please.2. The ability to attach Proton Docs. I already subscribe to Proton Unlimited and heavily use Proton Drive. This would make the ecosystem far more usable.3. Image file types as supported file types for uploads. I frequently screenshot things and ask ChatGPT about it. I’d love to do that with Lumo.4. Switches, toggles, customization. I’d love to be able to give Lumo custom instructions without having to upload a document for every chat with instructions written in it.5. Hallucinations. Sometimes they’re charming, but they’re often not. Reduced hallucinations would be a big plus.With all that said, Lumo has started in an excellent place. Proton seems to be doing a great job with frequent enough updates and I’ll be watching this closely. And privacy focus on top of that? Chef’s kiss. If this gets to the point where it can cover most of my daily use cases, I’m switching to it immediately.
Developer Response
Thank you for your review. We've shared your feedback with the team for future improvement. You can follow our blog (https://proton.me/blog) and our direct channels for any news and updates.That said, make sure to use the thumbs down button to share your input with us regarding any inadequate responses. Our team is looking into these reports in order to further improve the quality of the answers in the future.
Massive and potentially damaging issues!!
estelxxavier
It’s a nice chatbot/assistant but this can barely be considered AI at its current development stage. For instance, Lumo couldn’t do the basic task of being asked to find some furniture with specific features, sending me tables full of not only broken links (one table had only 2 working links) some even seemed to have completely made up urls. Most concerningly, on the morning of the USA’s strike on Venezuela, Lumo tried convincing me that the event had never taken place, claiming there were no verified sources (it was headline news on an international scale). Even after being given sources from that same morning, it then claimed that the date was incorrect on the source, only after 2 or 3 more queries did the AI update its response. This shows the AI is not fundamentally on a level where it can be a reliable source for any kind of information, even basic questions have the potential to be incorrect. Although the intention of AI is not to think for you, many people do look to AI for knowledge and genuine help. The larger implication of this is that if the AI is this unreliable, there is NO GUARANTEE that it couldn’t accidentally produce incorrect or dangerous information that could lead to a situation where someone is hurt in some way.
Usability issues due to keyboard space staying up
Duchamps Artois
During my very first use of this app immediately upon installing, it became apparent that reading responses would be nigh impossible. Why? Because while the keyboard disappeared upon sending my request, the space it took failed to collapse, reducing the space available to display the response to a mere 6 lines of text. Additionally, a button overlayed the response text. Its purpose seems to be to scroll down to the end of the response. Unfortunately it made it impossible to reach the text displayed next to it, for the purpose of scrolling. So the only area that would respond to scrolling exists above that button-a mere three (3) lines of text. Imagine having to scroll through several paragraphs of a response when you can see only 6 lines at a time, and can use but 3 of them to scroll through the remainder. An utter usability disaster, this app does not lend itself to be used for anything serious, it its current state.
Developer Response
Sorry to hear that. We are aware of the issue, and our team is working on a potential fix to resolve it, although we currently don’t have a specific timeframe that we can share. Make sure to keep the app up-to-date for any improvements. Meanwhile, we’ve made sure to document your report accordingly.
Picture Purr-fect - You can now download images straight from your chats. The app saves them natively, so grabbing a picture just works.
Link and Let Link - Tapping an external link now opens it correctly in your browser instead of getting stuck in the app.
Sheet Cat-astrophe Averted - The model selection panel no longer stretches to full screen when opened with the keyboard up. It now sizes neatly to its content every time.
Version 2.0.1
The developer, Proton AG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Contact Info
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
