Lumo by Proton
In-app purchases
3.2star
1.15K reviews
100K+
Downloads
Everyone
info
About this app
Ask anything. It’s confidential.
Meet Lumo, the privacy-first AI assistant created by Proton, the team behind encrypted email, VPN, password manager, and cloud storage trusted by over 100 million people.
Lumo helps you stay productive, curious, and informed — without ever compromising your privacy.
Start a confidential chat today.
Meet Lumo, the privacy-first AI assistant created by Proton, the team behind encrypted email, VPN, password manager, and cloud storage trusted by over 100 million people.
Lumo helps you stay productive, curious, and informed — without ever compromising your privacy.
Start a confidential chat today.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App activity, and App info and performance
Data is encrypted in transit
You can request that data be deleted
Ratings and reviews
3.1
1.09K reviews
Vince E
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September 8, 2025
Generally seems pretty good, and it appears that the team is making quick improvements. However the weekly prompt limit on the free tier isn't very generous. It would be great if there were additional tiers for existing proton subscribers to further try it, before adding another subscription... especially with other free semi-private options like duck.ai that don't appear to impose any limits.
12 people found this review helpful
Proton AG
September 9, 2025
Thank you for your review. We've shared your feedback with the team accordingly.
Simon Carter
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August 28, 2025
Fast and knowledgeable, I've been using Lumo as a way to learn about the background, social and political to The Battle of Hastings. I've been able to get excellent, detailed and clear English responses to all my questions and musings around this historical period. Really easy to use in its text-based form. I've not had a chance to try anything else yet. So far, so good. 4-stars and it could be 5-stars but I need to use it for a while. Impressive, frankly.
22 people found this review helpful
Proton AG
August 29, 2025
Thank you for your support. We'd love to earn a 5-star rating from you -- if you have any suggestions on how we can improve our service, don't hesitate to pass your feedback along to us at https://proton.me/support/contact. We always appreciate our community's input.
Neil
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October 16, 2025
Edit: Lumo has improved a lot, but there are still mistakes, and a high price for what you get. I'm on a duo plan as of now, and hope that there will be adjustments to lumo for paying users. First review: Lots of mistakes, fails to answer, requires additional subscription to protons unlimited plan for unlimited access, very high price compared to what you get.
3 people found this review helpful
Proton AG
July 27, 2025
You can use the thumbs down button under the response to share your input with us about any inadequate responses. Our team is looking into these reports for future improvement. On another note, adding Lumo would require raising the price of Unlimited due to the cost of AI, so our current plan is to keep Lumo standalone rather than raising prices.
What’s new
🐾 Compose UI now stays snug – no more drifting components; everything stays right where you expect it.
🐾 Speech‑to‑Text finally listens – the voice engine is now crystal‑clear and responsive, so dictating feels as smooth as a cat’s purr.
🐾 Orientation‑change hiccups squashed – rotating your device no longer throws the app into a tail‑spin; layouts adapt gracefully.
🐾 A litter of minor bugs caught and fixed – from tiny glitches to stray UI quirks, we’ve chased them all away. 🐛➡️😸
🐾 Speech‑to‑Text finally listens – the voice engine is now crystal‑clear and responsive, so dictating feels as smooth as a cat’s purr.
🐾 Orientation‑change hiccups squashed – rotating your device no longer throws the app into a tail‑spin; layouts adapt gracefully.
🐾 A litter of minor bugs caught and fixed – from tiny glitches to stray UI quirks, we’ve chased them all away. 🐛➡️😸
App support
About the developer
Proton AG
support@protonmail.zendesk.com
Route de la Galaise 32
1228 Plan-les-Ouates
Switzerland
+41 22 884 11 00
