Lumo AI by Proton

Name: Lumo AI by Proton
Rating: 3.8 (508 reviews)
Author: Proton AG

By: Proton AG App

Private Assistant from Europe

Overview

Version:

2.0.4

Last updated: 2026-08-21

Features & Capabilities

Meet Lumo, the privacy-first AI assistant from Proton. No tracking, no profiling, and every chat remains confidential—delivering a respectful balance of productivity and privacy.

From Proton’s privacy-focused toolkit, Lumo helps you stay productive, curious, and informed without compromising privacy. This open-source project invites transparency, with code available at https://github.com/ProtonLumo/ios-lumo. For more information, visit https://lumo.proton.me/about and review Terms of Service at https://lumo.proton.me/legal/terms.

User Growth & Download Statistics

App AI Privacy & Security GenAI Open Source

By:

Proton AG

Rating:

3.80

(508) 6 new ratings

Version:

2.0.4 Last updated: 2026-08-21

Version code:

889985253

Creation date:

2025-07-23

Compatible devices:

Size:

95.34MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-09-08

Compare stats and ranking:

Ranking

# 78,477 ▲ 293

Other rankings

#49 in copilot keyword 21 ▼ 7

Other platforms

Lumo by Proton (v2.0.6-gms)

341,486 3.78

(2,933)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Proton AG

Apple Apps Store

https://apps.apple.com/us/app/lumo-ai-by-proton/id6746714949

Website:

https://lumo.proton.me/about

User Reviews

Users praise Lumo AI for its privacy-first approach and usefulness for everyday tasks, along with the ability to include sources in responses and improved performance after updates. However, recurring issues undermine reliability: crashes and freezes, overheating, and unstable performance; inconsistent chat history syncing across devices; confusing billing/subscription behavior; clunky UI/UX with difficult history management; and occasional inaccurate or overly restricted answers. Overall, the app is valued for privacy and daily usefulness, but it still needs fixes in stability, syncing, billing clarity, and user experience.

Pros

Privacy-first design and strong data security
Reliable for daily personal tasks and safe to use
Ability to provide sources and citations for information
Notable performance and responsiveness improvements after updates (faster composer, snappier)
Trust in the Proton ecosystem and commitment to privacy

Cons

Stability and performance issues including crashes when sending, freezing, white screens, and CPU overheating
Unreliable data synchronization across devices and chat history
Confusing billing and subscription handling (weekly caps, credits)
UI/UX problems including hard navigation, small fonts, and difficult history management
Occasional inaccurate answers or overly strict guardrails limiting helpful responses

Recent reviews

Im a recent Lumo Plus subscriber running v2.0.4 I’ve tried signing out and re-installing. Nothing remedies these issues. There are some persistent UX/UI issues that can’t be ignored: - Freezes - gets stuck and freezes when scrolling through a conversation. (This is incredibly frustrating). - Slow/laggy - slow to launch - still crashes when generating a response when phone falls asleep or when switching apps. - navigation is delayed, sticky and not smooth - can’t add more than one photo at a time to a question/prompt - can’t hit refresh or re-try the question or prompt if it fails to generate a response the first time. You must copy/paste and start over again. - Frequent “you’ve hit message limit” alerts when opening a conversation even though that’s not the case. This app is the opposite of smooth. It need’s a lot of work and the team needs to ship updates more quickly. All of these issues and a week since the last update is unacceptable. It feels like no one is paying attention behind the scenes. When it does respond, the depth and insight is unmatched to other LLMs. But it’s just not very user friendly right now. I’m using an iPhone 17 pro with the latest software update as of today: iOS 26.6.1

by JD*****, 2026-09-01

Overall this AI has come a long way. I was using Gemini and I’ve actually found I like Lumo better, the UI to me is actually better and its responses are more to my liking. Is it perfect? No. It is though a clear choice for privacy, security and not in your face AI. Good job Proton!