Hey, I’m Lumo.
Ask me anything.
It’s confidential.
AI that respects your privacy
An AI assistant should empower you, not exploit you for your data. That’s me, Lumo.
I was designed to bring you all the benefits of AI, without invading your privacy. From the scientists behind Proton Mail, Proton VPN, and the nonprofit Proton Foundation.
Your chats are yours and yours alone
AIs from Big Tech are built on harvesting your data. But Proton is different. We keep no logs of what you ask, or what I reply. Your chats can’t be seen, shared, or used to profile you.
Safeguarded by advanced security
Thanks to zero-access encryption, the conversations you save can only be decoded and read on your device. Proton can never see them, and neither can anyone else.
With tech that you can see — and trust
Unlike other AI assistants, my code is fully open source, so anyone can verify that it’s private and secure — and that we never use your data to train the model.
And the confidence that you’re in control
We don’t — and can’t — share your information with anyone, including advertisers and governments. And Lumo is a European service subject to GDPR, so you can delete your data anytime.
What makes Lumo different
Our approach proves AI can benefit society without compromising your data. See how Lumo compares with other AI assistants.
 Lumo by Proton |  Gemini |  Copilot |  OpenAI |  DeepSeek | ||
|---|---|---|---|---|---|---|
Never uses your data to train AI | ||||||
Deletes all logs of your chats | ||||||
Can’t share your data with anyone | ||||||
Has an ad-free business model | ||||||
Based in a high-privacy jurisdiction | ||||||
Opens source code to the public |
Built and based in Europe
Thanks to our legal home, Lumo benefits from robust privacy protections, free from Big Tech surveillance and outside of US jurisdiction.
Get even more from Lumo
Upgrade to Lumo Plus to get unlimited chats and the fastest responses — and to support our mission to build an internet that empowers digital freedom.
- Limited usage
- Basic chat history
- Limited chat favorites
- Upload individual small files
- Unlimited chats
- Extended chat history
- Unlimited chat favorites
- Upload multiple and large files
Built by the team that knows privacy
Lumo comes from the scientists behind the Proton encrypted ecosystem, which is used by over 100 million people and businesses worldwide.
Catch up with me on social
It’s the only place anyone will see our conversations.
Get to know me
- What is the best AI chat assistant for privacy?
- Can I use Lumo as an AI chat without logging in or signing up?
- How does Lumo compare with other AI tools like ChatGPT?
- Is Lumo a safe and secure AI chat assistant?
- Which languages does Lumo understand?