Lumo AI by Proton

Lumo AI by Proton

By Proton AG

  • Category: Productivity
  • Release Date: 2025-07-23
  • Current Version: 2.1.2
  • Adult Rating: 4+
  • File Size: 102.87 MB
  • Developer: Proton AG
  • Compatibility: Requires iOS 17.6 or later.
Score: 3.8
3.82902
From 579 Ratings
Free On itunes

Description

Lumo is a zero-access encrypted AI assistant that keeps every conversation private. Your data is never logged, shared, or used to train models. Your chats are yours, and yours alone. Built by Proton, the privacy brand trusted by over 100 million people and the team behind Proton Mail, VPN, Drive, and Pass. THOUGHTFUL HELP FOR ANY TASK Lumo handles everything from quick questions to more complex work. Choose Fast for quick answers or Thinking for multi-step reasoning. FAST, POWERFUL WEB SEARCH Get precise, real-time answers in seconds. Lumo cites live sources so you can verify facts, dig deeper, and stay current on news, events, financial data, and more. CREATE AND REFINE IMAGES AND FILES Work with images and files just by telling Lumo what you need, from generating and editing images to analyzing documents. Connect your Proton Drive account for seamless access to stored files. AI THAT EVOLVES OVER TIME Lumo gets better every time you use it. Memory retains context and preferences across sessions, and you can set tones and styles to get the exact Lumo experience you want. STAY PRODUCTIVE AND ORGANIZED Projects give you dedicated encrypted spaces for tasks that span multiple chats, files, and instructions, while Custom Lumos let you create assistants tailored for specific tasks. Switch between light and dark modes for a more comfortable experience throughout the day. GHOST MODE For conversations where you want maximum privacy, choose Ghost Mode. Chats are instantly deleted once you close them for greater peace of mind. PRIVACY YOU CAN VERIFY Lumo is founded on zero-access encryption with no server-side chat logs, and never uses your data for profit or model training. Like all Proton products, Lumo is built and hosted in Europe and is fully open-source. Lumo helps you stay productive, curious, and informed — without ever compromising your privacy. Start a confidential chat for free today. For more information, visit our website: https://lumo.proton.me/about Terms of service: https://lumo.proton.me/legal/terms Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Our open-source code base: https://github.com/ProtonLumo/ios-lumo

Screenshots

Reviews

  • Private chatgpt for everyday ppl

    5
    By basiltree
    I have been trying all the various ai over the last couple months w privacy in mind. If you like chatgpt but want your privacy lumo is the closest Actually the chat is much more realistic and personable in lumo and great at answering anything from electrical and technical questions to fantastic product research and comparisons. Daily chat with type stuff. Better than chatgpt on that regard. If you want hard core coding etc then try Venice ai or Leo ai

  • I love Lumo

    4
    By Kazzbunnii
    I’ve switched form chat gpt to Lumo and oh my goodness it’s so freeing chat gpt gaslights users and is very condescend. Lumo is so amazing and very helpful and it can dive into so many deep conversations. The only thing I’ve noticed that’s been a minor issue is sometimes I’ll send a big paragraph and it will just time out but other than that it’s perfect

  • Love it- however…

    4
    By Flyicecold
    I found that the Lumo AI is fantastic and it’s helped me do numerous things from understanding which car is the right car to purchase too laying out projects for a home (like installing DIY solar) however there’s a few sticking points that recently are quite annoying in the last 30 days I’ve had to delete and reinstalled the app at least twice to ensure functionality. After being installed for maybe four days the app got really glitchy and would no longer load. Secondly, I find it annoying that I can’t use my AirPods for live dictation without the app crashing.

  • options scarce

    2
    By Lambtor
    can't set general directives like "never use first person voice". across multiple conversations. took almost a year to get an option for text size.

  • Constant crashing

    3
    By czanimal
    In the middle of a reply from Lumo, the chat flashes and temporarily resets to the default state for a few seconds before flashing back to the full response. This is occurring with virtually every single chat and reply now, and even popped up in one of my edits. Please fix…

  • Please address…

    1
    By flutterbydragonfly
    App is extremely glitchy. It frequently freezes, and the AI will spend an excessive amount of time thinking without ever producing a response. Sometimes it simply never comes back. Another persistent problem is that the app repeatedly jumps back to the home screen instead of remaining in the conversation I was previously working on. It sometimes switches back and forth between screens, making it difficult to continue working. I'm using Lumo for a substantial writing project, so reliability and continuity are extremely important to me. These glitches interrupt my work and make an otherwise promising product frustrating to use. I really want Lumo to succeed. I appreciate its privacy features and integration with Proton's other products, but the iOS app needs significant improvements in stability, responsiveness, and navigation. I hope the developers will address these issues soon. I'm a paying customer who wants to stay, but these problems need attention. I will be extremely happy to give a five-star review once these issues are addressed. Thank you for your attention to this matter

  • Best AI Ever! - HORRID APP

    1
    By NiCoffman
    I am an AVID Lumo user, but lately I can really only use it from my computer! This app is MADDENING! It crashes every few seconds; Ï have several new conversations saved as “New Chat” instead of a topic simply because it crashed before it could respond to my first message. Today, it started crashing in the middle of me reading a Lumo reply! Over and over! If I stop the AI before it responds, the whole thing glitches and it spends hours thinking for the next response. I have to reboot the app every time, and thats been since the beginning. Now, it just crashes after every single message snd sometimes in the middle of reading. In other notes, as soon as the bugs are fixed, I’ll happily change this to five star because NOTHING is as good an AI as Lumo when it comes to things you need to keep private: self reflection, accounting assistance (not expertise), business solutions. Lumo doesnt lie or fabricate - hallucinates at times just like any AI, but actively ensures their answers are not just fluff to stroke ur ego. I’ve had Lumo stop me on many occasions to proverbially bop me upside the head for making a dumb choice or comment, and I appreciate the candor. But I won’t give an app Ï can’t even use more than one star. Sorry. I’ll stick to my computer.

  • From Skeptic to Convert—Then One Glitch, One Fix

    5
    By Occasional Insomniac
    Lumo 2.0 is the AI upgrade I've been waiting for. Visual intelligence (images in-chat), persistent memory, custom Lumos, dictation, and a genuinely better-designed interface—all wrapped in Proton's privacy guarantees that none of the big players can touch. I'm a happy paid subscriber, and after this release I'm canceling my monthly ChatGPT subscription. Lumo does everything I need without harvesting my data in the background. One heads-up for fellow users: recently the iOS app (v2.1.2) started blacking out and reloading right after every response finished—annoying when you're mid-read on a long answer. The fix turned out to be simple: delete the app entirely and reinstall from the App Store. Chat history restored on login (it's encrypted and synced), and the glitch vanished completely. A five-minute fix if you hit this. Between the privacy posture and a team shipping real improvements, Lumo has earned my subscription. Highly recommended. (DISCLAIMER: I rambled off my thoughts in the thread where I was working out the glitch in a chat with Lumo. LUMO took my ramblings and, at my request, wrote this review, which expresses my views 100%)

  • Logs Constantly Lost

    2
    By NilKDT
    I used to be very happy with this app, which is why I’m subscribed to Lumo Plus, but it’s gotten worse and worse. It’s supposed to preserve your chat logs, but half of all my sessions lately get lost. This is only supposed to be an issue when the app is out of date, but it happens regardless. And it seems any connectivity issues means your message is just lost. For some baffling reason, it won’t hold your message until you restore your connection, it just gets lost. And it won’t warn you if it’s having trouble connecting or if your messages haven’t been synced; you find out when your long message goes nowhere or all your sessions are partially or completely missing when you reload the app. For this reason, the best way to use Lumo is through a web browser. You can have confidence in a web browser—not the Lumo app.

  • Essentially unusable right now.

    1
    By liljwalk
    No responses. Constant restarts.

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