Lumo by Proton

Proton AG

In-app purchases

About this app

"Lumo is a zero-access encrypted AI assistant that keeps every conversation private. Your data is never logged, shared, or used to train models. Your chats are yours, and yours alone.

Built by Proton, the privacy brand trusted by over 100 million people and the team behind Proton Mail, VPN, Drive, and Pass.

THOUGHTFUL HELP FOR ANY TASK
Lumo handles everything from quick questions to more complex work. Choose Fast for quick answers or Thinking for multi-step reasoning.

FAST, POWERFUL WEB SEARCH
Get precise, real-time answers in seconds. Lumo cites live sources so you can verify facts, dig deeper, and stay current on news, events, financial data, and more.

CREATE AND REFINE IMAGES AND FILES
Work with images and documents just by telling Lumo what you need, from generating and editing images to analyzing documents. Connect your Proton Drive account for seamless access to stored files.

AI THAT EVOLVES OVER TIME
Lumo gets better every time you use it. Memory retains context and preferences across sessions, and you can set tones and styles to get the exact Lumo experience you want.

STAY PRODUCTIVE AND ORGANIZED
Projects give you dedicated encrypted spaces for tasks that span multiple chats, files, and instructions, while Custom Lumos let you create assistants tailored for specific tasks. Switch between light and dark modes for a more comfortable experience throughout the day.

GHOST MODE
For conversations where you want maximum privacy, choose Ghost Mode. Chats are instantly deleted once you close them for greater peace of mind.

PRIVACY YOU CAN VERIFY
Lumo is founded on zero-access encryption with no server-side chat logs, and never uses your data for profit or model training. Like all Proton products, Lumo is built and hosted in Europe and is fully open-source.

Lumo helps you stay productive, curious, and informed — without ever compromising your privacy. Start a confidential chat for free today.

For more information, visit our website: https://lumo.proton.me/about
Terms of service: https://lumo.proton.me/legal/terms
Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Our open-source code base: https://github.com/ProtonLumo/ios-lumo"

Ratings and reviews

App works great for me, supports voice input and files (had some problems with this though). Responds quickly usually. For the platform iself, limited weekly input is kind of insane, especially since I'm already an unlimited member. I didnt even use it that much and got locked after a day. Need to pay another monthly fee to use normally

Won't accept image files. Try png, jpg, jpeg "Unsupported file type". The images open in any other app on the same device. Button icons could use work too, they're mostly intuitive but there are a couple that aren't fully obvious. What exactly does the globe button do, and why does it have a unique background? Is that the web search enabled button? If so, is it toggled on when the unique background is dark gray or light gray? Private AI sounds best, but pointless if lacking basic functionality.

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’s new

Lumo 2.0.3 focuses on a faster, smoother startup — the app launches quicker and loading, background, and keyboard animations no longer stutter. The loading and offline screens have been rebuilt as native screens, including a new connection-error screen. We've also polished the interface so the status and navigation bars match the app background.