Lumo AI by Proton

Name: Lumo AI by Proton
Rating: 3.8 (433 reviews)
Author: Proton AG

By: Proton AG

Private Assistant from Europe

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

(433) 1 new ratings

Version:

1.5.2 Last updated: 2026-06-24

Version code:

887276872

Creation date:

2025-07-23

Compatible devices:

Size:

37.72MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-29

Compare stats and ranking:

Ranking

# 91,504 ▼ 188

Other platforms

Lumo by Proton (v1.5.4-gms)

275,213 3.67

(2,404)

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

I really wish i could get a refund for this app. I like it because no one will be reading what you are saying or stealing your data but this is the WORST ai app I’ve ever used.

by Is*****, 2026-06-21

I have faith this will survive the AI bubble but will it get an offline model?

by Ru*****, 2026-06-16

As long as you recognize that the information that Lumo gives is outdated, you'll be fine. At least they dropped the "every word's a pun" garbage and chose to prioritize selling what they're selling instead of selling bad puns. ------------------- I want to update but I couldn't understand what the dev was trying to say in the update description. Maybe next time I'll be able to take this app seriously. I have no idea if it is AI slop or if the app's a joke