Lumo by Proton
Lumo by Proton Summary
Lumo by Proton is a free, with in-app purchases Android app in Productivity by Proton AG. Released in Jun 2025 (1 year ago). It has about 370K+ installs and 3.1K ratings with a 3.82★ (average) average. Based on AppGoblin estimates, it reaches roughly 36K monthly active users and generates around $<10K monthly revenue (100% IAP / 0% ads). Store last updated Oct 1, 2026
Recent activity: 14K installs this week (28K over 4 weeks) showing steady growth , and 60 new ratings this week View trends →
SDK intelligence: AppGoblin detected 3 development tools(e.g. Google),and 1 business tools integrated into Lumo by Proton. View full SDK list →
Data tracking: The app's network data flows (API traffic to/from the app and its SDKs) were last crawled on Jan 18, 2026.
Lumo by Proton SDKs Summary
Lumo by Proton was last scanned for SDKs on 2026-08-30. Below is the overview of third-party companies detected in the app. The full list of SDKs, permissions and unknowns is available here.
Google
Sentry.io
Square
JourneyApps3.82★
Ratings: 3.1K
Screenshots
App Description
A private AI assistant by Proton
"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 documents 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"