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
The deal breaker is still that it is not possible to upload pictures. When this is implemented, I will consider subscribing
Developer Response
We're sorry to hear that. Are you still experiencing the same issue? Have you tried reinstalling the app? Please contact us at https://proton.me/support/contact with more details so we can investigate the issue further.
Ok. Can’t answer simple questions
Maks-C
Ok assistant from time to time. However, asking questions that should be within the parameters of allowed questions to respond to, doesn’t make any sense. For instance, Proton is now in a partnership with Cape (Telecom operator in the states), but asking lumo about this, creates answers like «I’m sorry, but i can’t help with that». This is just one of the cases. The moderation of this privacy focused AI is tedious.Software bug: - going in and out of the app, forces you to shut down the app completely, as only a white screen appears when you reopen the app.- sometimes lumo only writes the first line, and then completely stops. You have to refresh for lumo to be able to answer. Hpwever this answer is not the same as the first one started.
Developer Response
Thanks for the feedback. Feel free to use the thumbs-down button to share your feedback regarding Lumo's answers. Our team is looking into these reports to improve the quality of the service.
Lumo Keeps Making Mistakes and Cannot Read Proton Docs in Projects!
LadyMisft
I have used Lumo since the day it launched. Lumo has made annoyingly many mistakes since its latest big update, it did not do that before! Also Lumo cannot read Proton Docs which is a big problem in Projects!
Developer Response
We're sorry to hear that. Please contact us via the contact form on our website, with more details about the issue/s you are experiencing so we can better help.
Good Concept, Bad Delivery
snoopcolin
No dark mode? you psychos
Developer Response
Dark mode is in the works, so stay tuned for any news and updates on this.
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 based, for example, 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