Lumo
Proton's privacy-first AI assistant with zero-access encrypted chat history and no logs.
- Verified facts
- 4 of 4
- Alternatives ranked
- 5
- Approved reviews
- 0
- Visits sent from here
- 0
About Lumo
Lumo is the AI assistant from Proton, the Swiss company behind Proton Mail and Proton VPN. Its pitch is privacy: conversations are saved with zero-access encryption so only you can read them, Proton says it keeps no logs of your chats and never uses them to train AI models, and Lumo's code is open source so those claims can be checked. The company is built and based in Europe. It covers everyday chat, web search, file uploads and image generation, and links with Proton Drive. It suits people who want AI help without handing their conversations to an advertising or AI company. The trade-off is capability: the open models it uses trail the frontier models in ChatGPT, Claude or Gemini on hard reasoning and coding, and it has fewer integrations. There is a free plan with limits, and Lumo Plus adds unlimited chats, more chat history and more usage of its strongest model. It runs on the web, iOS and Android.
Best for: Privacy-focused people, especially existing Proton users, who want an encrypted assistant.
Pros and cons
What works
- Zero-access encryption for saved chats
- European company and data centres
- Fits into the wider Proton ecosystem
Why people leave
- Models trail the frontier assistants on hard tasks
- Few integrations outside Proton
- Free plan has tight limits
Top Lumo alternatives
See all 5- 1
Duck.ai66.5Free and anonymous, with access to some frontier models and no account needed.
- 2
Venice62.6Private chat with more models and media generation, history kept in your browser.
- 3
Mistral Vibe (formerly Le Chat)59.6Another European assistant with stronger models and more features.
- 4
Jan57.2Run models entirely offline on your own computer.
- 5
Claude55.3Stronger models with opt-out training controls, if you can trade some privacy.
Why people left Lumo
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Lumo: common questions
Is Lumo free?
Lumo has a free plan and paid plans.
Is Lumo open source?
No, Lumo is not open source. Open-source alternatives include Jan.
What platforms does Lumo run on?
Lumo is available for Web, iOS and Android.
What are the best alternatives to Lumo?
The highest-ranked Lumo alternatives right now are Duck.ai, Venice and Mistral Vibe (formerly Le Chat). See the full ranked list for pricing, platforms and verified facts.