Today I learn about Lumo, a new AI assistant from the folks at @protonprivacy.
The cynic and ex-Proton customer in me cannot help but think that an AI assistant is definitely not on top of the priority list for Proton customers today. It’s curious that Proton would choose to focus on that. I guess AI is where it’s at these days, you got to surf that wave…
AI assistant that respects your privacy
Lumo
- Strict no-logs policy
- Encrypted
- Built and based in Europe
It seems the free version gives you access to “limited daily chats”. There is no more information right now, I’m assuming you’re limited to a certain amount of tokens but they don’t say how many. Lumo itself won’t tell me either 😐

Their docs mention that the bot uses open-source models: Nemo, OpenHands 32B, OLMO 2 32B, and Mistral Small 3. Some may find those a bit limited, but the privacy focus is certainly interesting! That makes me curious to see what’s the advantage of Lumo versus using one of the many apps that allow you to use LLMs locally.
Their landing page and docs also keep mentioning that Lumo’s code is open source, so I figured I may find some answers there. Unfortunately I wasn’t able to find any link to the actual source. Proton has multiple GitHub organizations (ProtonVPN, Proton Mail), but I couldn’t find any Lumo repositories there. It must be somewhere, I’m just surprised the folks at Proton didn’t link to it!
@jeremy @protonprivacy I was able to get Lumo to tell me how many questions could be asked each day on the free tier assuming usage conditions were all average amounts.
Answer: 50 – 100 per day
Of course it could be a complete fabrication so no real way to know for sure.
@jeremy @protonprivacy I was also able to get Lumo to provide a link to the GitHub page for its source code, though it doesn’t appear to exist… At least publicly. Yet.
https://github.com/ProtonMail/lumo
Nice work!
I assume we’ll get an official answer in the next few days, as folks start running into the limits and Proton communicates about it. 🤞
@jeremy @protonprivacy Seems not available as open source.
@jeremy
@protonprivacy
The (quite obvious) advantage over local LLMs, is that you don't need to run and maintain them yourself.
They often have high demands for processing power that not anyone can just run locally.
@jeremy @protonprivacy I think I might now be a future ex-customer…