56
BU Score
Solid
Lumo by Proton
✍️ BU Analytics Review
“
Lumo by Proton is an iOS app from Proton AG in the Productivity category, currently rated 3.8★ across 409 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.
Our BU Score puts it at 56 — Solid (established niche player). For a Productivity app, that means established niche player.
Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.
creator
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 8 of 8 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| bugsREVIEW | −$1,800 | |
| 5 starREVIEW | +$1,800 | |
| Multilingual (11 languages)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| slowREVIEW | −$1,200 | |
| New app (9 months old)METRIC | −$700 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Early-stage install base (409 ratings)METRIC | +$400 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 25
Aug 25
Sep 25
Oct 25
Nov 25
Dec 25
Jan 26
Feb 26
Mar 26
Apr 26
May 26
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 37 MB🔞 4+📱 iOS 17.6+🔖 v1.4.1🔄 updated 4d ago🌐 CS, NL, EN, FR, DE +6📂 Productivity💰 Paid🚀 Launched 2025 (0y old)
📝 About this app
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.
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
Lumo helps you stay productive, curious, and informed — without ever compromising your privacy.
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
🆕 What's New · v1.4.1
Purr-fect Headphone Handoff - Plugging in or unplugging headphones mid-conversation no longer causes a cat-astrophic crash. Lumo now handles audio switches as gracefully as a cat landing on its feet.
iOS 17 Gets Nine Lives Back - Fixed a crash that cut off message sending on iOS 17 devices. Lumo now delivers your words without burning through any of those precious nine lives.
Auto-cat-rect Is Back - Autocorrection and spell checking are working again in the message composer. Your typos won't slip through the cat door anymore!
Sorry for all the puns :)
iOS 17 Gets Nine Lives Back - Fixed a crash that cut off message sending on iOS 17 devices. Lumo now delivers your words without burning through any of those precious nine lives.
Auto-cat-rect Is Back - Autocorrection and spell checking are working again in the message composer. Your typos won't slip through the cat door anymore!
Sorry for all the puns :)
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Lumo by Proton
- Developer
- Proton AG
- Bundle ID
- me.proton.lumo
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- CS, NL, EN, FR, DE, IT, PL, PT, RU, ES, TR
Company
- Website
- lumo.proton.me
- Tagline
- Hey, I'm Lumo
- Description
- Meet Lumo, the zero-access encrypted AI assistant by Proton that does not track or record your conversations. Ask me anything — it's confidential
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- OG image
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $1.3K/mo
- Top-grossing rank
- Outside top 100 in US Productivity
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- Not found
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- Not found
⭐Recent App Store Reviews49 latest · avg 3.37★ · 34.7% 5★ · 12.2% 1★
5★17 (35%)
4★7 (14%)
3★8 (16%)
2★11 (22%)
1★6 (12%)
+1 ratings/week
Praise: love ×10 great ×8 best ×5 amazing ×1 excellent ×1Complaints: bug ×4 expensive ×2 broken ×2 crash ×1 terrible ×1
Top positive
★★★★★ Ghost Mode
Incognito AI search? Why has it taken me so long to find you Lumo? Awesome tool!…
★★★★★ Top Dog…er Cat
Just as capable as other cloud models, now with 100% more security!…
Top negative
★☆☆☆☆ Critical Sync Bug & Performance Issues for Paying Customers
I am a paying Lumo+ subscriber, and I am experiencing critical issues that make the app unusable.
Data Loss: My chat history is not syncing across devices. Chats appear on my iPhone but are missing from the website and iPad. When I try to …
★☆☆☆☆ More than inaccurate
Well, what would you expect from 2yrs old data???!!!!…
📈Ratings growth409 ratings+1415% lifetimeShow 3-year history estimate ▾
Tracked (49 weeks) Pre-tracking estimate (11 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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