Lumo AI by Proton

Lumo AI by Proton

Private Assistant from Europe

525 ratings
567 reviews
Free
In-App Purchases

Details

Released
July 23, 2025
Updated
September 16, 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

2.1.0

September 16, 2026

Paw-some update. Sessions now live on the native side, so managing them is faster and smoother than ever. Switch accounts in a flash. A new native UI makes moving between accounts quick and effortless. Account settings, at home. Native account settings give you direct control without leaving the app. The right ID, finally. iOS now reports itself as the Lumo app, so your session list shows exactly where you're signed in. Locked down, securely. Sign in with a hardware security key. Your second factor stays offline and untouchable.

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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

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As long as you recognize that the information that Lumo gives is outdated, you'll be fine.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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So far so great!

I’ve loved my first few days with this app so far! Adorable cat and super helpful AI

Off to other platform as much to be desired

Updated Oct7 to add: I’ve exported everything to use another platform because lumo is subpar. Paying for the privilege of tools uncompetitive in the market was not on my bingo card for lumo or Proton as a business customer.
The worst part is I’m paying for Lumo to constantly fabricate throughout chats, sometimes so subtly you miss it and then get half way through before it’s clear.

Leaving much to be desired. Slow menu bar still requires waiting for 20+ seconds to appear.
Still unable to recognise proton files, requiring business users to download proton files natively to Microsoft or Google files and then paste into chat. No PNG or JPEGs are readable.
Lumo’s own project folder architecture is unable to read anything within a project so you are uploading file after file even if in the same project making it useless.

I’ve just exported everything to use another platform because it’s subpar. Paying for the privilege of tools not competitive in the market was not on my bingo card for lumo.

iOS App Opens to Blank Chat — Menu Unresponsive on Launch:

Sharing issue here because the app is not responsive, despite everything being up to date Aug26. Will update when it’s fixed.

Side note: the fact that you can’t upload proton documents into lumo is an absolute failure. Your own suite of programs don’t talk to each other - I have to export a Proton document to a Microsoft or Google document to upload into Lumo! I chose to migrate to Proton to divest away from these American products.

When I open the Lumo app on iPhone, it always opens to a blank chat screen. The menu showing my Projects and chat history does not appear automatically. I have to tap the screen repeatedly for approximately 20 seconds before the UI becomes responsive enough to access the menu.

**Steps to Reproduce:**
1. Close the Lumo app completely (swipe up from app switcher)
2. Tap the Lumo icon to relaunch
3. Observe blank chat screen with no visible menu
4. Attempt to tap screen/tap menu button — no response
5. Continue tapping/waiting ~20 seconds until UI finally loads

**Impact:**
This adds unnecessary friction every time I open the app. It feels like a bug rather than intended behaviour, especially for an app that should prioritise quick, seamless access.

**Expected Behaviour:**
- A menu button or sidebar icon should be visible immediately on launch
- Or, at minimum, the app should show the chat/menu list without requiring repeated taps and a 20-second wait

**Environment:**
- IPhone 13
- Lumo Plan: Business

**Request:**
1. Fix the unresponsive launch behaviour
2. Consider showing a cached/unencrypted menu structure on launch while encrypted content decrypts in the background
3. Confirm whether this is a known issue or a bug that needs investigation
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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.