Lumo AI by Proton

Lumo AI by Proton

Your Private AI Assistant

449 ratings
455 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • July 23, 2025
  • July 7, 2026
Lumo AI by Proton screenshot #1 for iPhone
Lumo AI by Proton screenshot #2 for iPhone
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Lumo AI by Proton screenshot #5 for iPhone
Lumo AI by Proton screenshot #6 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

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What's New in Lumo AI by Proton

2.0.1

July 7, 2026

Picture Purr-fect - You can now download images straight from your chats. The app saves them natively, so grabbing a picture just works. Link and Let Link - Tapping an external link now opens it correctly in your browser instead of getting stuck in the app. Sheet Cat-astrophe Averted - The model selection panel no longer stretches to full screen when opened with the keyboard up. It now sizes neatly to its content every time.

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Subscription plans

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

Almost there

The 2.0 update has been huge and it now feels possible to jump from frontier model providers to an alternative that comes close in performance and features whilst keeping your data private.

There’s still a few niggling issues (the load time when first opening the app on iOS is way too long, not being able to add existing conversions to projects, not being able to have project-specific personalisation, custom lumos not being available on the app). Lumo will be great if you address this sort of things and keep up with the latest/best open weight models.
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Unusable

Tap mic button – immediate crash, app closes. Not occasionally, every time. If you cannot talk to your AI, it is not useful. It’s 2026 – why do we even have a text field anymore? (I’ll give it to you for odd spellings and exact numbers, but honestly … )

Lumps 1.0

I downloaded Lumos 1.0 when it came out and liked it just the way it was. Proton upgraded my app. I would like to have Lumos 1.0 back on my device. Is that possible?

Really good but could use refinement

I value privacy so I downloaded the app. It works good for my daily usage . The responses aren’t as verbose as chat gpt. I would like the ability to upload multiple pictures at once. Also I think it would be good to not have to enter a prompt when a picture is uploaded within the same chat.

Depends on use case

It certainly chats with you. I wouldn’t use it for research. I mainly use ChatGPT. I asked ChatGPT to come up with a knowledge test for Lumo, and it generated a prompt to determine who oversees the CDC and the WHO and what actions have been taken by either in the past 90 days. Lumo took a really long time to think about it before giving up (based on other reviews, I’m not sure if giving up was an error or because the prompt was political, though I wasn’t trying to make the AI take any particular stance).

Then I decided alright, let’s ask it something simple but somewhat obscure, so I asked it for Sonic’s middle name. It said Sonic did not have a middle name, not even in the Archie comics. ChatGPT got Maurice immediately and provided a citation.

I’d be comfortable using this to bounce ideas off of or vent, but it’s ability to search for information isn’t quite up to par. I do really like the interface and the cat mascot though. I hope it continues to improve.
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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.