Lumo by Proton

Everyone

Savor a unique interactive experience alongside Lumo by Proton. Proton AG introduces cutting-edge innovations supporting APPzone. Browse Productivity now.

Best Strategy And Playing This App Lumo by Proton

"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 documents 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"

A private AI assistant by Proton

Updated on

Aug 14, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.

No data shared with third parties
about how developers declare sharing
This app may collect these data types
Personal info, App activity, and App info and performance
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

2.72K reviews

David Millard

July 28, 2026

Getting that same stuck on 2.0 as some other users. no way to get around it. Just did a reinstall and back stuck on 2.0 Welcome screen. I opened on my A Series Galaxy and it clicked through. Opened on my Galaxy Tab and it clicked through. The issue seems to be localized on the Galaxy Ultra. maybe a resolution? Downloaded from here. Only after 2.0 update did I receive a problem. I read others did too. Only on my Ultra did it happen.

6 people found this review helpful

Proton AG

July 13, 2026

That doesn't sound right. Could you share more details about the issue? Are you receiving any error messages? Where exactly did you download the app from? Did you experience this behavior with earlier versions of the app? Contact us through the contact form on our website with more details so we can investigate further and help you troubleshoot.

J B

March 17, 2026

Won't accept image files. Try png, jpg, jpeg "Unsupported file type". The images open in any other app on the same device. Button icons could use work too, they're mostly intuitive but there are a couple that aren't fully obvious. What exactly does the globe button do, and why does it have a unique background? Is that the web search enabled button? If so, is it toggled on when the unique background is dark gray or light gray? Private AI sounds best, but pointless if lacking basic functionality.

17 people found this review helpful

Proton AG

March 18, 2026

Thank you for your feedback. Lumo’s capabilities are currently focused on text-based files, although we’re working on the ability to upload and analyze more file types such as photos. On another note, the globe icon indeed represents the web search function. When the background behind it is light gray, it means it's enabled.

Bryce Cable

May 19, 2026

App works great for me, supports voice input and files (had some problems with this though). Responds quickly usually. For the platform iself, limited weekly input is kind of insane, especially since I'm already an unlimited member. I didnt even use it that much and got locked after a day. Need to pay another monthly fee to use normally

13 people found this review helpful

Proton AG

May 19, 2026

Thank you for your review. We're currently keeping Lumo as a standalone product to avoid increasing the price of our Unlimited plan. This way, we can keep the cost manageable for all our users while still offering advanced AI features to those who want them. That said, if you're having any issues, contact us through the contact form on our website.