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About Lumo
Lumo is an AI chat assistant from Proton, the company behind Proton Mail. Its focus is confidentiality: saved chats are protected with zero-access encryption, and Proton says the assistant does not track or record your conversations.
It works like other general-purpose assistants, answering questions in a chat window in the browser. It suits people who want to use an AI assistant without their conversations becoming training data or a profile held by the provider.
Strengths
- Zero-access encrypted chat history
- Provider states it does not track or record conversations
- From an established privacy company
Limitations
- Little public detail on models and limits in the research
- Requires trusting Proton's privacy claims
Details
- Pricing
- FreemiumPlans are not listed in the research; check Proton's site for current pricing.
- License
- Proprietary
- Developer
- Proton
- Platforms
- Web
- How it runs
- Web application
- Works offline
- No
- Best suited for
- Privacy-minded users who want an AI assistant that does not keep readable chat logs
- Categories
- Privacy tools, AI assistants
- Last verified
- Added
- Sources
Alternatives to Lumo
Compare allSoftware that can replace Lumo for an important use case, and what changes if you switch.
Venice
A privacy-focused AI app for chat, image, video, audio and code generation with many models.
Venice is a privacy-focused freemium app with private or anonymized model access across text, image and video, though it is tied to a crypto token ecosystem.
Le Chat
Mistral AI's chat assistant, a multilingual AI chatbot from a European developer.
Le Chat is Mistral AI's multilingual assistant from a European developer, but it does not advertise zero-access encrypted chat history.
Jan
An open-source ChatGPT replacement that runs entirely offline, and can also front cloud providers when you want them.
Jan is an Apache 2.0 desktop app that can run models fully offline on Windows, macOS and Linux, so chats never leave your computer.
Private LLM
An offline AI chat app for iPhone, iPad and Mac that runs open language models on the device.
Private LLM is a paid offline app for iPhone, iPad and Mac with no account, tracking or logs, limited to Apple devices.
ChatGPT
OpenAI's AI assistant for conversation, writing, coding, analysis and image creation.
ChatGPT offers broader writing, coding, analysis and image features, but prompts are processed on OpenAI's servers without Lumo's zero-access encryption.
Claude
Anthropic's AI assistant for writing, analysis and coding, with a large context window.
Claude brings a large context window and strong coding ability, but it is an online service without Proton's zero-access encrypted history.
Similar software
Related functionality, not necessarily a direct replacement.
Kagi
A paid, ad-free web search engine with anti-tracking, result customization and an AI assistant.
Perplexity
An AI answer engine that searches the web and replies with cited sources.
Enclave AI
An iPhone, iPad and Mac app for chatting with open-source AI models that run offline on the device.
GPT4All
A local AI chat app with document chat built in, from Nomic AI. Stable, MIT licensed, but not updated since early 2025.
