Swiss privacy company Proton has launched Lumo, a new AI assistant designed as a more private alternative to ChatGPT, Gemini and Claude. Lumo can rewrite emails, summarise documents and review code, but unlike its rivals, it does not log, store or train on user prompts or chats.
Conversations with Lumo are end-to-end encrypted and not stored on Proton’s servers. The company says it cannot access, share or learn from user data. By default, Lumo does not pull information from the internet, but if web search is enabled, it uses privacy-first search engines without logging queries.
Proton has not confirmed which models power Lumo, but it is likely built on smaller, community-developed systems. This may result in less detailed responses compared to models trained on larger datasets. The source code is expected to be released soon.
Lumo is available on the web, iOS and Android. There are two free tiers and one paid tier. Guest users can ask a limited number of questions per week without an account. Free Proton account holders get access to Lumo Free, which includes basic encrypted chat history and small file uploads. The paid Lumo Plus subscription costs £10.59 per month (or £8.19 annually) and offers unlimited chats, longer history and larger file uploads.
Proton is headquartered in Switzerland, which has stricter privacy laws than the US, where ChatGPT, Gemini and Claude are based. This means Proton cannot be legally compelled to hand over user data in the same way.
