Lumo AI by Proton

Lumo AI by Proton

Private Assistant from Europe

560 ratings
575 reviews
Free
In-App Purchases

Details

Released
July 23, 2025
Updated
October 20, 2026
Lumo AI by Proton screenshot #1 for iPhone
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About

This AI assistant prioritizes your privacy, offering help with productivity, curiosity, and staying informed. Developed by the team behind trusted encrypted services, it ensures your data remains secure.

✓Privacy-first AI assistant
✓Boost productivity
✓Satisfy curiosity
✓Stay informed
✓Secure data handling
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What users say about Lumo AI by Proton

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What's New in Lumo AI by Proton

2.1.2

October 20, 2026

Fixed Saving From Chats - Files now land in Photos or Files natively on iOS instead of getting stuck in a web view.

2

Subscriptions & In-App Purchases

Lumo Plus (1 month)

Lumo Plus 1 month subscription

$12.991 Month
How to cancel Lumo AI by Proton subscription ⁉️

Events

Read more about Lumo 2.0 is here

Lumo 2.0 is here

Faster, smarter, and more powerful than ever

Jun 30, 2026 — Jul 31, 2026

Read more about Lumo 1.3: Introducing Projects

Lumo 1.3: Introducing Projects

Your secure AI workspace for every task

Jan 26, 2026 — Feb 26, 2026

User reviews

Major step forward

The first iteration was disappointing but this is now an entirely usable app. It’s not Claude Fable or Opus (Oct 2026), but it’s a fair balance between privacy and intelligence. And it wasn’t, it appears, trained on material that came from pirated material. We don’t need Lumo to be at the frontier: we just need it to be within viewing distance of it so that the trade off between privacy and “not falling behind” is viable. Good job.
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Très efficace !

Excellente IA qui préserve la vie privé et donne des réponses très rapides et très pertinente 👌🏻

I tried

After a few chats, it told me that I had used up my quota of questions. I didn't create an account, so maybe that is a thing. But considering that it uses an old model of AI without an account, I don't see how it can compete with the DDG browser and its private AI chats. I haven't found any such limits there, and the model are new. What is the benefit of this app over that one? Can you please explain

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OLD REVIEW:

As long as you recognize that the information that Lumo gives is outdated, you'll be fine.

At least they dropped the "every word's a pun" garbage and chose to prioritize selling what they're selling instead of selling bad puns.

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I want to update but I couldn't understand what the dev was trying to say in the update description. Maybe next time I'll be able to take this app seriously. I have no idea if it is AI slop or if the app's a joke
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W

Not bad I have used it for a few months only thing I would ask for a change is make it so it stops giving you a table ever time u send a message

No longer private

Tested Extremely rare, never mentioned anywhere else topics on lumo, minutes later the specific answers are given as you tube video suggestions.
This app is selling your data.
Not data profiling: i never mentioned the topic ever before on lumo.
Not cross sdk tracking: i don’t have any google or meta or other products. And i never mentioned the test subjects.
No one else on the network,
No smart devices on the network.
Lumpo is selling your data in real time
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Response from developer

We do not keep logs of your activity in Lumo, and we don’t have access to your encrypted chat history, so we can never share it or leak it to third parties. Your conversations with Lumo are protected with zero-access encryption, meaning only you can access your data. Every conversation you save is encrypted in a way that can only be accessed by you, on your device. We don’t log or record your conversations. With respect to processing, the server-side model is running on machines operated by Proton. To learn more about the privacy of Lumo, navigate to https://proton.me/support/lumo-privacy. If you have any additional questions or concerns, feel free to reach out to us via the contact form on our website so we can further help.

Developer apps

User experience

🐞

Reported Bugs

2 issues

Slow sign-in page

Bug

Lack of real-time data access

Bug
✨

Requested Features

5 requests

Dynamic Type support for adjustable font size

Feature

Secure access to Proton Drive files

Feature

Ghost mode to ensure no chat history is saved

Feature

Intuitive history clearing option

Feature

App mode

Feature

FAQ

What does Lumo AI do?

Lumo AI is a privacy-focused artificial intelligence assistant designed to help users stay productive, curious, and informed. It aims to provide assistance without compromising user privacy.

What are the key features of Lumo AI?

Key features include its privacy-first approach, assistance with productivity tasks, satisfying user curiosity, and helping users stay informed. It is developed by the team behind other secure Proton services.

Is Lumo AI free to use?

The application is free to download and use, with the possibility of in-app purchases for additional features or services. Specific details on pricing for in-app purchases are not provided in the description.

What platforms is Lumo AI available on?

Based on the provided terms of use, the application is available on Apple's platform, indicated by the reference to 'apple.com/legal/internet-services/itunes/dev/stdeula/'. Compatibility with other operating systems is not specified.

How does Lumo AI ensure user privacy?

Lumo AI is developed by Proton, a company known for its commitment to privacy and security in services like encrypted email and VPNs. The app is designed to protect user data and privacy throughout its operation.