Lumo by Proton

Lumo by Proton

Proton AG·3.8 ★·FREE
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Description

"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"

Developer

Proton AG

Developer ID: 7672479706558526647

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Ratings & Reviews

3.8

3,287 ratings

100,000+ downloads

5★
47%
4★
22%
3★
12%
2★
0%
1★
19%

Recent Reviews

Brian Schwartz

v2.1.5-gms

very useful and much quicker and smarter than previous generation. image creation and editing. privacy and security. I love proton products. not perfect but it's pretty capable for free too.

Oct 27, 2026

Pascal Dk

v2.1.5-gms

I have lost all my favorited/starred discussions - It does human mimicking even when specifically instructed not to - Programmed to lie : when I asked "why did you lie to me" when it actually lied to me, it replied "I have favoured the appearance of competence over the precision of the facts".

Developer Response

As with any AI, Lumo can make mistakes. Use the thumbs down button to share your input with us about any inadequate responses. These reports help us further improve the quality of the answers in the future. As for your chats being lost, contact us via the "Help and feedback" option letting us know the plan you're subscribed to so we can help.

Oct 27, 2026

Oct 27, 2026

Lucas

v2.1.5-gms

Peace of Mind

Oct 25, 2026

Adina

v2.1.5-gms

very easy to use, i like the variety of settings available for the user, i like how the response is structured

Oct 25, 2026

Kdp Gupta

v2.1.5-gms

Everything about it is excellent but app has some lag. App is slightly slow compare to gemini and chatgpt.

Developer Response

Thank you for the review. Could you share more details on this? In what aspect are you experiencing the slowness (e.g. starting the app, navigating the app, waiting for a response, etc.)? Where exactly have you downloaded the app from? Contact us through the "Help and feedback" → "Report a problem" option under the account menu so we can help.

Oct 27, 2026

Oct 25, 2026

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