Lumo AI by Proton

Lumo AI by Proton

Private Assistant from Europe

485 ratings
505 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • July 23, 2025
  • August 21, 2026
Lumo AI by Proton screenshot #1 for iPhone
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Lumo AI by Proton screenshot #7 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

2.0.4

August 21, 2026

Photo Paste Pounces In. Paste photos straight into your message on iPhone. Copy an image anywhere, then long-press the composer to open the native edit menu and drop it in. No Cat Naps Mid-Answer. The screen stays awake while Lumo writes, so you can read along without tapping to keep it alive. iPad Sidebar Clawed Back. In windowed mode on iPadOS 26, the system window controls no longer cover Lumo's sidebar button, so it's easy to reach again. Security Fur-tified. Behind the scenes hardening to keep your data where it belongs. Nothing for you to do.

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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

Melhorou muito

Pra quem usa o Lumo desde o começo ele evoluiu muito e a premissa dele de ter mais privacidade e nao ter suas conversas usadas pra treinar modelos é bem interessante

I miss lively Lumo.

I wish I could keep Lumo out of the icon box in the loading screen, and make Lumo bigger and animated like it was before. Also, I really miss animated ghost Lumo.

It’s purely aesthetic and has nothing to do with the functionality, but the liveliness of Lumo was a very important part of the app to me. It made the app feel much warmer and cosier than stark apps for bigger companies LLM.
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Response from developer

Hi! Thank you for sharing your feedback. We'll make sure to forward it to our team so that it can be taken into consideration for future improvements.

Tolle KI-App – bei uns im Alltag angekommen.

Ich hab Lumo 2.0 vor ein paar Wochen installiert und muss sagen, es hat sich schnell bei uns etabliert. Mit anderen KI-Chat-Apps hatte ich immer mein Problem beim Thema Datenschutz und den wöchentlichen Chat-Limits.

Was für mich wichtig ist: Alles ist Ende-zu-Ende verschlüsselt. Bei uns kommen auch mal gesundheitliche Fragen rein oder Sachen zur Schule der Kinder – da will ich einfach nicht, dass irgendwer mitliest oder Daten weitergegeben werden.

Mit Lumo 2.0 Lite mach ich die schnellen Sachen, kurze Fragen, kurze Texte, sowas. Geht fix und reicht völlig. Wenn's mal komplizierter wird, schalt ich auf Lumo 2.0 Max – das ist langsamer, aber dafür gründlicher. Bei Matheaufgaben vom Gymnasium meines Älteren oder wenn ich Arbeitsblätter vom jüngeren hochlad und mir was erklären lassen will, nehm ich Max.

Der Speicher ist neu und extrem nützlich – Lumo weiß beim nächsten Chat noch, in welche Klasse die Kinder gehen und welche Schule. Ich muss das nicht jedesmal neu erzählen. Klingt klein, ist aber im Alltag echt praktisch. Spart auch Tokens weil der Kontext bekannt ist. Hört sich selbstverständlich an kann nicht jede Ki und explizit nicht so genau wie Lumo 2.0.

Beruflich nutze ich es für Zusammenfassungen und Textarbeit, auch hier je nach Anspruch mal Lite, mal Max. Lange Gespräche werden automatisch zusammengefasst, Kontext geht nicht flöten.

Nicht alles ist perfekt, manche Antworten könnten besser sein, insbesondere das Wetter und ab und an braucht Max einen Moment lang. Aber für mich ist es aktuell die beste KI-App, gerade weil ich das Gefühl hab, meine Daten sind safe und ich hab noch nie die Limits aufgebraucht.
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Privacy first that earns your trust

If you value privacy and ethical tech, Lumo is a no-brainer. It may not be the most feature-packed or powerful LLM out there, and the UX has room to grow, but that's not the point. What sets Lumo apart is what's happening behind the scenes: your data isn't being mined, scraped, or used to train models. You're not the product.

As a Proton user, subscribing is a given, the Plus plan is genuinely reasonable, there's no cap, and it pays off. The key is to invest time upfront: set up your projects and structure your work. Do that, and Lumo's responses are excellent.

It's not trying to be everything to everyone, and that honesty is refreshing. If protecting your data matters to you (and it should), this is the best AI assistant available.
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Recurso de Voz necessário

O app tá até legal mais ele tá precisando de recurso de voz urgente, as vezes ele manda um texto enorme, que acaba dificultando o que eu tenho de fazer porque eu tenho que ficar com um olho lendo e o outro fazendo o que tenho de fazer

Response from developer

Thank you for your review. We've shared your request with the team for future consideration. You can follow our blog and our social media channels for any news and updates.

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.