What is Lumo?
Lumo brings you the full power of an intelligent AI assistant without the privacy compromises you've come to expect. Developed by the trusted team behind Proton Mail and backed by a Swiss non-profit, Lumo is engineered from the ground up to empower you, not exploit your data. It’s the smart assistant that finally puts your privacy first.
Key Features
🔒 Experience True Chat Confidentiality with Zero-Access Encryption This isn't just standard encryption; it means your saved conversations are locked on our servers in a way that only you can decode on your device. We can't see them, and neither can anyone else. Your thoughts and queries remain exclusively yours.
✍️ Benefit from a Strict No-Logs Policy Your conversations are ephemeral on our servers. We don't keep records of your chats, ensuring your queries can't be used to build a profile on you, sold to advertisers, or handed over to third parties. Your curiosity remains confidential.
📄 Analyze Files and Documents with Complete Privacy You can securely upload documents, reports, or contracts to have Lumo summarize, translate, or answer questions about them. Your files inherit the same rigorous privacy protections as your chats, so your sensitive data remains yours alone.
🌐 Access Real-Time Information with a Privacy-First Search When you need current information, you can enable Lumo's web search feature. It queries the internet through privacy-respecting search engines, providing you with up-to-date answers without compromising your browsing habits.
transparent Trust Through Verifiable Open-Source Code
Lumo is built on a foundation of transparency. Its code is fully open source, allowing independent security experts to verify that our privacy and security promises are backed by solid engineering. You don't have to just take our word for it.
How Lumo Solves Your Problems:
Lumo is designed for practical, everyday use where privacy is paramount.
For Handling Sensitive Information: Whether you're researching a confidential legal matter, exploring personal health questions, or drafting a sensitive business proposal, you can use Lumo with confidence. Its zero-access encryption and no-logs policy create a secure space for your most important queries.
For Professional Productivity: Streamline your workflow by asking Lumo to summarize lengthy reports, draft professional emails, or even generate code snippets. Upload a document and instantly get the key takeaways, saving you valuable time and effort while keeping your work private.
For Learning and Research: Students and researchers can use Lumo to understand complex topics or analyze academic papers. When you need the latest information for your work, a quick toggle enables the privacy-first web search to bring in real-time data and sources.
Why Choose Lumo?
Built on a Foundation of Trust Lumo wasn’t created in a vacuum. It comes from the scientists behind Proton’s globally recognized privacy services, like Proton Mail and Proton VPN. Our mission is managed by a Swiss non-profit foundation, legally bound to prioritize user privacy over profit.
Your Data Is Never the Product Unlike many AI services that use your conversations to train their models or target you with ads, Lumo is different by design. Your data is never used for training, and your privacy is never for sale. We are funded by optional, paid subscriptions—not by monetizing your information.
Conclusion:
In a world where AI often demands your data as payment, Lumo offers a better path forward. It delivers the intelligent assistance you need to be more productive and creative, grounded in a proven commitment to privacy and security. You no longer have to choose between cutting-edge technology and your fundamental right to privacy.
More information on Lumo
Launched
2010-10
Pricing Model
Free Trial
Starting Price
Global Rank
Follow
Month Visit
1.1M
Tech used
Top 5 Countries
30.35%
10.45%
9.34%
8.49%
4.93%
United States
Germany
France
Switzerland
Netherlands
Traffic Sources
2.48%
0.4%
0.77%
14.69%
5.76%
75.89%
social
paidReferrals
mail
referrals
search
direct
Source: Similarweb (Sep 25, 2025)
Lumo was manually vetted by our editorial team and was first featured on 2025-07-30.
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