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AssistantProton

Lumo

Privacy-first AI assistant with zero-access encrypted chats.

Category
Assistant
Pricing
FREEMIUM
Source
Open core
Hosting
Cloud
Platforms
WebiOSAndroid
Models
Multi-model
Verified
Jun 20, 2026

Lumo is Proton's privacy-focused AI assistant. Conversations are protected with zero-access encryption and decrypt only on your device, with no server-side logs and nothing used for model training. It runs on open-source language models hosted in Proton's European datacenters, and the app itself is open source. Free to use without an account; Lumo Plus adds unlimited chats and larger uploads.

Pros & cons

  • Zero-access encrypted chat history
  • Open-source app and underlying models
  • No logs; data not used for training
  • Free tier, no account required
  • Open models lag the top frontier LLMs
  • No third-party model choice
  • Fewer integrations than big assistants

Tags

Further reading

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Open Lumo