Lumo by Proton

Name: Lumo by Proton
Availability: InStock
Rating: 3.640000104904175 (3120 reviews)
Author: Proton AG

Proton AG

In-app purchases

3.12K reviews

Everyone

100K+

Downloads

Everyone

Learn more

About this app

"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

Oct 1, 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
Learn more 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

2.95K reviews

Lee Forest

September 16, 2026

Great all around AI. Doesn't do videos. But handles images, coding, research, writing, brainstorming, planning, conversation, whatever else you might expect from the typical AI. It's been my goto for most of my tasks and I'm not disappointed. Startup can be a little slow but given the privacy aspect and all it offers I can deal with that.

5 people found this review helpful

Stu S

September 16, 2026

2FA doesn't work, so I can't log in. Total fail. Visionary account. Note I *can* access it fine on the web, using proton pass to autofill and a physical yubikey. But with the app, the yubikey fails (known issue, already reported by someone else on github). And the totp code also failed, with repeated attempts. Also note one (of multiple) attempts with the physical key went a little nuts. I saw it attempting to fill in garbage in the password when I activated the key.

4 people found this review helpful

Proton AG

September 16, 2026

That doesn’t sound right. Could you share more details about the issue? Are you receiving any error messages after entering the 2FA code? Where have you downloaded the app from? We'd be happy to help, but we need some basic details to work with. Please contact us through the contact form on our website so we can assist you further.

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.

10 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.