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Lumo AI by Proton

Lumo AI by Proton

Private Assistant from Europe

525 ratings
540 reviews
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • July 23, 2025
  • September 16, 2026

Developer

Proton AG
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About

This AI assistant prioritizes your privacy, offering help with productivity, curiosity, and staying informed. Developed by the team behind trusted encrypted services, it ensures your data remains secure.

✓Privacy-first AI assistant
✓Boost productivity
✓Satisfy curiosity
✓Stay informed
✓Secure data handling
Show original description

What users say

Summarized from real user reviews of Lumo AI by Proton. Based on 525 reviews and a 3.8/5 average, it highlights the 3 positives and 5 negatives reviewers mention most about this Productivity app.

Positive things

  • 👍Sophisticated knowledge base
  • 🚀Rapid evolution with quality
  • 💡Potential for vision-enabled model

Negative things

  • 🐛Inability to answer basic questions
  • 🔒Privacy concerns with data processing
  • 🐛Inconsistent responses
  • 🐛Frequent sign-outs
  • 🐛Dark mode issues
See all reviews
+1

What's New in Lumo AI by Proton

2.1.0

September 16, 2026

Paw-some update. Sessions now live on the native side, so managing them is faster and smoother than ever. Switch accounts in a flash. A new native UI makes moving between accounts quick and effortless. Account settings, at home. Native account settings give you direct control without leaving the app. The right ID, finally. iOS now reports itself as the Lumo app, so your session list shows exactly where you're signed in. Locked down, securely. Sign in with a hardware security key. Your second factor stays offline and untouchable.

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Subscription plans

Lumo Plus (1 month)

Lumo Plus 1 month subscription

$12.991 Month
How to cancel Lumo AI by Proton subscription ⁉️

Events

Read more about Lumo 2.0 is here
Event EndedMajor Update

Lumo 2.0 is here

Faster, smarter, and more powerful than ever

Jun 30, 2026 — Jul 31, 2026

Read More

Read more about Lumo 1.3: Introducing Projects
Event EndedMajor Update

Lumo 1.3: Introducing Projects

Your secure AI workspace for every task

Jan 26, 2026 — Feb 26, 2026

Read More

See All

User reviews

Most RecentHighest RatedLowest Rated

Privacy, sure. Ok for random chats. Useless for tasks.

It’s probably the most confidential ai out there, supposedly. So I use it for research and feedback since I have no local agent. It’s not worse than Claude or ecosia ai, and it doesn’t annoy me with that typical one-line gpt formatting. I don’t like the privacy part with those. It hallucinates a lot, validates to a point of being useless, doesn’t follow instructions, doesn’t produce any meaningful results, uses exploitative language as most do. I guess I have high expectations from AI since it’s supposed to take over our jobs, brains, and stuff. Maybe one day there’ll be an language model that’s actually intelligent, so humans can be programmed with truth not distortions - but that’s a big ask for humanity as a whole. For thinking, executing, and writing, I still prefer my own brain.
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Aurea.FAurea.F

Response from developer

Thank you for your feedback. As with any AI, Lumo can make mistakes. You can use the thumbs down button to share your input with us regarding any inadequate responses. Our team is looking into these reports in order to further improve the quality of the answers in the future.

Top

Bonjour, j’aimerais beaucoup régler la police d’écriture, avoir un voice mode.
Sinon top merci l’équipe !!
fffyyhgfffyyhg

I love Lumo!!

Thanks for remind me through your e-mail! I would like to say Lumo is impressive and very useful!! The best way that I could contribute with this magnific work, is being an ad-man for proton products( are not perfect but is trying always to improve)!! Just because Lumo help me in many things when asked, but is not only that, Lumo is working with love and dedication despite I pay or not and I understand the necessity to have profit, and is our total system. But at the moment I trying to compesate my first bad and injusto review divulging the proton product always as I can! I love this lilas cat, very lovely and careful with me!! BRAVO!! Sorry with the english language!!!
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27laja27laja

Clunky / Unfriendly

I’m bought into the Proton ecosystem with drive, mail, authenticator and pass. I tried shifting over to use Lumo but there was just too many flaws in how it responded and how you interact with it. Simple requests of adding an image to a project chat, hoping it will with draw the text and add it to a list, ends up with the image being dropped into a drive folder, assigned a massive file name and then Lumo being completely unaware what you’re referencing if you ask it to document the image. The further inability to have it read and update emails and the calendar has sent me back to ChatGPT for the foreseeable future. I think it has a long way to go to become more user friendly and reliable, and yes I have reported all of this through customer service. I wanted so much to work with this but it’s just nowhere near the other options out there.
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Thunder_CloudThunder_Cloud

Response from developer

We're sorry to hear about your experience. Would you mind sharing your ticket number with us here? We'd be more than happy to check on your report and see how we may be able to help you further. In the meantime, we've taken note of your feedback accordingly.

惜しい　改善期待してます

機能と思想は優秀。ただ、
①長時間チャットが破損し全内容消失or空回答(これ頻繁に起こる)
②過去チャットの参照・リンクが効かない(プライバシー保護と表裏一体だが方法はあるはず)
③全体エクスポート機能なし
④複数画像の一括選択不可

この四点が埋まれば間違いなくファーストチョイス。特にモバイルでの全体エクスポートはE2EEと組み合わせて他社にない強みになり得る。改善期待を込めて3つ。
通りすがり1028通りすがり1028

Response from developer

Thank you for the review. We've passed on your feedback to the team accordingly. That said, please reach out to us through the "Help and feedback" → "Report a problem" option under the account menu with more details about the issues you're experiencing, including screenshots of any error messages you may be receiving, so we can have a better understanding and assist you further.

See 535 more reviews

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User experience

🐞

Reported Bugs

2 issues

Slow sign-in page

Bug

Lack of real-time data access

Bug
✨

Requested Features

5 requests

Dynamic Type support for adjustable font size

Feature

Secure access to Proton Drive files

Feature

Ghost mode to ensure no chat history is saved

Feature

Intuitive history clearing option

Feature

App mode

Feature

FAQ

What does Lumo AI do?

Lumo AI is a privacy-focused artificial intelligence assistant designed to help users stay productive, curious, and informed. It aims to provide assistance without compromising user privacy.

What are the key features of Lumo AI?

Key features include its privacy-first approach, assistance with productivity tasks, satisfying user curiosity, and helping users stay informed. It is developed by the team behind other secure Proton services.

Is Lumo AI free to use?

The application is free to download and use, with the possibility of in-app purchases for additional features or services. Specific details on pricing for in-app purchases are not provided in the description.

What platforms is Lumo AI available on?

Based on the provided terms of use, the application is available on Apple's platform, indicated by the reference to 'apple.com/legal/internet-services/itunes/dev/stdeula/'. Compatibility with other operating systems is not specified.

How does Lumo AI ensure user privacy?

Lumo AI is developed by Proton, a company known for its commitment to privacy and security in services like encrypted email and VPNs. The app is designed to protect user data and privacy throughout its operation.