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

EDIT: upon reinstalling the app, it loaded correctly after it attempted reloading a couple of times by itself (which is what it did last time, but failed/crashed). now to review the actual product, i've generally enjoyed it, but i'm disappointed with the limit on how long inactive chats last. i didn't expect to lose any, but i did, which is sad. i personally think they should last for at least 30 days (a month) for free members, rather than just 7 days (a week) as another review suggests

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.

Functional but many glitches after only 10mins of usage. In the middle of the AI answering, suddenly answer is all erased and the screen says "Something went wrong. Your request didn't go through or couldnt be completed. try sending it again". Happened 4X in 10mins. Then ofc the fact that I can't upload JPG pics is annoying. apparently I have to change format to PDF first. what a hassle. Even Gpt free accounts allows seamless jpg uploads. I like the trajectory, just needs SO many improvements

What’s new

Paws what you’re doing and check out the latest Lumo Android upgrade—now it lands on its feet every time (stability that’s fur‑real) and finally understands your meows with purr‑fect speech‑to‑text. 😺📱✨