Lumo by Proton

Productivity

★★★★★ 3.2

Installs

100,000+

Price

Free

Developers

Proton AG

Content Rating

Everyone

Android Version

Version

1.2.6-gms

Lumo by Proton APP Download

Introducing Lumo by Proton, a privacy-first AI assistant developed by the team behind trusted tools such as Proton's encrypted email, VPN, and password manager. With a commitment to user confidentiality, this app is designed to help you stay productive, curious, and informed without compromising your personal data.

Lumo stands out from the crowded field of AI assistants by prioritizing your privacy. Unlike many other technology companies, Proton ensures that your chats are encrypted and not used for training the AI, making it a safe choice for those who value their digital security. The app is user-friendly, allowing you to start a confidential chat quickly.

Despite its strong privacy features, Lumo has received mixed reviews and some user complaints regarding functionality. While many appreciate its capabilities, others have experienced issues with file uploads and incorrect responses. Proton is actively working to address these concerns and improve the app's performance.

In conclusion, if you are in search of a privacy-respecting AI assistant that offers a clean and secure way to explore your queries, Lumo by Proton is worth a try. Just keep in mind that it is still evolving, and user feedback is crucial in shaping its future updates.

User Reviews from Google Play Store

Sojasil Machistador

Apr 15, 2026

★★★★★(5)

superb

Version: 1.2.17-gms

Jan Natting

Apr 15, 2026

★★★★★(2)

my goodness how basic this is. cannot even tell me the time :(

Version: 1.2.17-gms

Developer Response

Sorry to hear that. Make sure to use the thumbs down button to share your input with us regarding any inadequate responses. Our team is looking into these reports in order to further improve the quality of the answers in the future. That said, you can enable the Web search feature in order to look up more up-to-date information.

Isabel Limonene

Apr 15, 2026

★★★★★(5)

Good AI app. Safe, secure and fast. Censored model btw

Version: 1.2.17-gms

Duane Mattos

Apr 15, 2026

★★★★★(1)

Lumo is still in beta in terms of functionality and it's misleading to not market it as being so. It can't process PDFs in projects. What's the point if I have to go to another engine to extract the text from PDF, then put it back in Proton Drive? For example.

Version: 1.2.17-gms

Developer Response

That doesn't sound right. Could you share more details? Does the issue persist only in projects and with all PDFs? Are you receiving any error messages? Please reach out to us through the contact form on our website so we can have a better understanding of the behavior and assist you further.

N. “g00gl3 sucks” D.

Apr 15, 2026

★★★★★(1)

Now nothing but a white screen, it does not function at all.

Version: 1.2.17-gms

Developer Response

That doesn't sound right. Could you describe the issue in more details? What are the exact steps you're taking that lead to the problem? Are you perhaps receiving any error messages? Contact us at https://proton.me/support/contact?topic=lumo with more details so we can investigate further and help you troubleshoot.