General Purpose Chatbotsfreemium

Proton Lumo

Zero-access encrypted chat from the makers of Proton Mail/VPN — no account needed to start chatting

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What Proton Lumo does

  • Zero-access encrypted chat from the makers of Proton Mail/VPN — no account needed to start chatting
  • Open-source client, no conversation logging or training on user data, by design
  • Free tier includes web search and basic chat history, not just a stripped demo

Proton Lumo — straight answers

What is Proton Lumo?

Proton Lumo is listed under General Purpose Chatbots, in the AI Chat & Assistants category on Flocci AI Tools. Zero-access encrypted chat from the makers of Proton Mail/VPN — no account needed to start chatting. It is freemium — a usable free tier with paid plans above it, and it lives at lumo.proton.me.

Is Proton Lumo free?

Proton Lumo is freemium: there is a free tier you can work in and paid plans above it. It is one of 426 freemium tools in the catalog, all labelled the same way so you are never surprised by a paywall.

Can I use Proton Lumo in a browser, or is there an app?

Proton Lumo works in a normal browser tab with no install. It is available on the web, iOS, Android and a Chrome extension.

What can Proton Lumo do?

Proton Lumo does 3 things the catalog singles out: Zero-access encrypted chat from the makers of proton mail/vpn — no account needed to start chatting; open-source client, no conversation logging or training on user data, by design; free tier includes web search and basic chat history, not just a stripped demo.

What is the best free alternative to Proton Lumo?

Apertus Chat (Public AI) is the closest free alternative: it sits in the same General Purpose Chatbots sub-category and is free. Falcon LLM Chat (TII), Google AI Mode and HuggingChat also start free. The full list is on the alternatives page.

See the full list →

Proton Lumo alternatives

Compare all alternatives →

ChatGPT

General Purpose Chatbots
freemium
  • Free tier on OpenAI's fast GPT-6/GPT-5.x 'Luna' models, with a Think button for harder questions
  • Voice, vision, image generation and web search in one app
  • Agent mode, projects, memory and file uploads
  • Custom GPTs and a large app/connector ecosystem
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Claude

General Purpose Chatbots
freemium
  • Free tier on Anthropic's Claude 5 family (Sonnet-class model by default)
  • Top-tier coding, writing and long-document reasoning
  • Artifacts for live code, document and app previews
  • Projects, memory, web search and MCP tool connectors
Visit

Gemini

General Purpose Chatbots
freemium
  • Free tier on Gemini 3.x Flash models, with limited access to the top Pro model
  • Very long context for whole books, codebases and long videos
  • Deep Google Workspace and real-time Search integration
  • Native image (Nano Banana) and video (Veo) generation, Gemini Live voice
Visit

Grok

General Purpose Chatbots
freemium
  • Free, rate-limited access to xAI's latest Grok 4.x models
  • Live data from X and the open web
  • Grok Imagine for image and video generation
  • Fast, less-filtered conversational style
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DeepSeek

General Purpose Chatbots
freemium
  • Free web and app chat on DeepSeek's V4-series models
  • Instant and Expert (deep-thinking) modes
  • Strong math, coding and reasoning at open-model cost
  • Models are also released as open weights
Visit

Microsoft Copilot

General Purpose Chatbots
freemium
  • Free tier mixing frontier OpenAI models with Microsoft's own MAI models
  • Built into Windows, Edge and Microsoft 365
  • Voice, vision and image generation
  • Copilot Vision can see and talk through your screen
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Head-to-head comparisons

Proton Lumo vs ChatGPTProton Lumo vs ClaudeProton Lumo vs GeminiProton Lumo vs GrokProton Lumo vs DeepSeekProton Lumo vs Microsoft Copilot