Lumo by Proton icon
Lumo by Proton icon

Lumo by Proton

Privacy-first AI assistant utilizing zero-access encryption and open-source code, ensuring no data logging, profiling, or training on chats, providing user-controlled, encrypted conversations, with compliance under GDPR and no sharing with third parties.

Lumo by Proton screenshot 1

Cost / License

  • Freemium (Subscription)
  • Open Source (GPL-3.0)

Platforms

  • Online
  • Android
  • iPhone
  • Android Tablet
  • iPad
  • F-Droid
3.7
Good18 ratings
158likes
18comments

Features

Properties

  1.  Privacy focused
  2.  Distraction-free
  3.  AI-Powered

Features

  1.  AI Chatbot
  2.  Ad-free
  3.  No Tracking
  4.  Encrypted Chat
  5.  No Logs
  6. Proton Drive icon  Proton Drive Integration
  7.  No registration required
  8.  Cloud Sync
  9.  AI Writing
  10.  End-to-End Encryption
  11.  Two-factor Authentication
  12.  Dark Mode
  13.  GDPR Compliant

Lumo by Proton News & Activities

Highlights All activities

Recent News

Recent activities

Comments and Reviews

   
Comment summary: Lumo earns praise for its privacy-first design, end-to-end encryption, clean interface, and suitability for sensitive searches, with users appreciating that chats are not used for profiling or training. However, reviewers question Proton’s open-source claims because key backend components, model selection, routing, and system prompts remain opaque. Slow responses, limited input support, overly long answers, unclear model attribution, Google Play dependence, and dated or uneven coding results also reduce its appeal.
Top Positive Comment
Hemang Tanna
2

I am at ease with Lumo AI by Proton.

Top Negative Comment
Darlene Sonalder
6

Great mascot I love it's design. However marketing it as Open Source is misleading as only the clients are. Especially how they started with words like "Unlike other AI assistants, my code is fully open source, so anyone can verify that it’s private and secure — and that we never use your data to train the model.".

But that's not my main issue with it. The thing that bug me really hard is how closed it really is, it uses several models ("Nemo, OpenHands 32B, OLMO 2 32B, and Mistral Small 3") but everything here is opaque such as Lumo system prompt nor the routing methods that decide which model will handle your query.

Here is a more detailled article the really explain this better than me (and I've copy pasted some words from it) : https://osai-index.eu/news/lumo-proton-least-open

Shaz Shah
0

I like that they're bringing an open source and privacy friendly AI product. But it's not entirely open source. Nevertheless, it's the privacy protections and the not learning from you is the main selling point.

On that open source front, there has been improvements:

  • released mobile app source code in mid-2026
  • GitHub repos available for inspection
  • Proton now publishes the specific model families: Nemo, OpenHands 32B, OLMO 2 32B, Mistral Small 3, GPT-OSS 120B, Qwen, Ernie 4.5 VL 28B, Apertus, Kimi K2
  • As of July 2026, still considered least open on the European Open Source AI Index

The cutoff for it's knowledge is a couple of years old. So when working as a programmer on systems that evolves frequently, I don't quite get the code/scripts that follows the typical patterns and best practices we follow in our industry. So, if you're looking for something specialised, you may want to create a project with the necessary set of instructions. But this would be limited if you try to point to llms.txt files.

Having said that, with the architectural improvements in Lumo 2.0, it's really good at searching and giving general knowledge answers. The personalisation is a nice touch, too.

Aashray Bhagtani
0

gotta use it for casual thinking

Viktor Korobov
1

I like that Proton is bringing its privacy-first philosophy to AI. Knowing that conversations aren't used for profiling or training makes Lumo an interesting alternative for anyone who regularly works with sensitive information.

Bhxyar (Web Directory)
0

Lumo is good and minimal design. But answer often too long to read.

Review from a new or low-activity account — shown here, but not counted in the app rating.
Fredric Luna
0

Been using Lumo on and off recently and I really appreciate the privacy-first approach. Nice to finally see a search experience that doesn't feel built around tracking.

Review from a new or low-activity account — shown here, but not counted in the app rating.
7 of 18 comments

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What is Lumo by Proton?

An AI assistant should empower you, not exploit you for your data. That’s me, Lumo.

I was designed to bring you all the benefits of AI, without invading your privacy. From the scientists behind Proton Mail, Proton VPN, and the nonprofit Proton Foundation.

Your chats are yours and yours alone

AIs from Big Tech are built on harvesting your data. But Proton is different. We keep no logs of what you ask, or what I reply. Your chats can’t be seen, shared, or used to profile you.

Safeguarded by advanced security

Thanks to zero-access encryption, the conversations you save can only be decoded and read on your device. Proton can never see them, and neither can anyone else.

With tech that you can see — and trust

Unlike other AI assistants, my code is fully open source, so anyone can verify that it’s private and secure — and that we never use your data to train the model.

And the confidence that you’re in control

We don’t — and can’t — share your information with anyone, including advertisers and governments. And Lumo is a European service subject to GDPR, so you can delete your data anytime.

Official Links

Lumo by Proton information

  • Developed by

    CH flagProton
  • Licensing

    Open Source (GPL-3.0) and Freemium product.
  • Pricing

    Subscription ranging between $12 and $28 per month + free version with limited functionality.
  • Rating

    Average rating of 3.7 (18 ratings)
  • Alternatives

    149 alternatives listed
  • News

    8 news article related to Lumo by Proton
  • Supported Languages

    • English
    • Czech
    • Dutch
    • French
    • German
    • Italian
    • Polish
    • Portuguese
    • Russian
    • Spanish
    • Turkish

AlternativeTo Categories

AI Tools & ServicesSecurity & PrivacyOnline ServicesBackup & SyncFile SharingSocial & Communications

Apple AppStore

  •   Updated 
  •   3.84 avg rating
View in AppStore

Our users have written 18 comments and reviews about Lumo by Proton, and it has gotten 158 likes

Lumo by Proton was added to AlternativeTo by Paul on and this page was last updated .