Lumo by Proton

Proton AG

In-app purchases

About this app

Ask anything. It’s confidential.

Meet Lumo, the privacy-first AI assistant created by Proton, the team behind encrypted email, VPN, password manager, and cloud storage trusted by over 100 million people.

Lumo helps you stay productive, curious, and informed — without ever compromising your privacy.

Start a confidential chat today.

Ratings and reviews

Generally seems pretty good, and it appears that the team is making quick improvements. However the weekly prompt limit on the free tier isn't very generous. It would be great if there were additional tiers for existing proton subscribers to further try it, before adding another subscription... especially with other free semi-private options like duck.ai that don't appear to impose any limits.

What ya'll doing, devs? Please fix the bugs for the android users. Don't ask me the issues I am facing. Just use it on an android phone. The responses stop suddenly, and most of the time, it doesn't respond at all. Shows red error saying, "Cannot show properties of undefined (reading 'name')", and the little retry button doesn't work either. Please, yo devs, fix it! It will be much appreciated.

The latest model changes have been great. I get really insightful responses, and fewer round trips. Some formatting issues with latex math. I love that it's privacy centered, and not vacuuming up all your data.

What’s new

Whisked in a handy home screen widget so you can pounce on conversations instantly, plus a sleek native composer that makes crafting your messages as smooth as a cat nap in the sun.