Privacy-minded people get encrypted chats that are not logged or used for training, with Plus at £10.90 a month.
Kenning's take
What it does
Lumo is Proton's AI chat assistant, built around privacy: chats are encrypted so Proton cannot read them, are not logged and are not used to train models. It answers questions, searches the web with cited sources, creates and edits images and reads uploaded files, and can open files from Proton Drive.
- zero-access encrypted chats, not used for training
- web search with cited sources
- image generation and editing
- document upload and analysis
- Proton Drive file access
- Fast and Thinking modes with memory
Who it suits. Suits privacy-minded people who want a chatbot that does not keep or train on their conversations.
Key facts
- Category
- Everyday AI assistants
- Made by
- Proton AG
- Based in
- Switzerland (Geneva, per Proton's terms of service)
- Launched
- 2025
- Works on
- iPhone, Android, Web
- In the UK
- Yes
- Free plan
- free without a Proton account: basic chat history, web search and small single-file uploads
Pricing
| Plan | Price | Billed |
|---|---|---|
| Lumo Plus | £10.9 | month |
| Lumo Plus (12 months) | £99.99 | year |
| Lumo AI Plus (proton.me, monthly) | $12.99 | month |
Ratings
Reviews and write-ups
- It's FOSS 2025-07-24
- Yahoo Tech
FAQ
Is Lumo free?
Yes. Proton says Lumo can be used free without a Proton account; Lumo Plus is £10.90 a month on the UK App Store.
Does Proton read Lumo chats?
Proton says chats are zero-access encrypted, not logged and never used to train models.
Who makes Lumo?
Proton AG, a Swiss company in Geneva that also makes Proton Mail and Proton VPN.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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