Comparison

Vector Space AI vs Lumo AI by Proton

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Vector Space AI

This app offers a fast, private AI companion that runs locally on your device, providing instant responses for writing, brainstorming, and coding. It also allows seamless switching to cloud-based AI for more advanced queries.

Highlights
  • Runs locally on device
  • Optional ChatGPT API connection
  • Modern and clean interface
  • Instant response times
  • Complete user data privacy
  • Seamless mode switching
Features
Read full description

Chat with FREE, FAST and POWERFUL AI that runs LOCALLY on your iPhone Meet your new AI companion that’s always available — no cloud, no lag, just pure speed. Our advanced local AI engine runs directly on your iPhone, giving you instant responses, full privacy, and offline intelligence. Whether you’re writing, brainstorming, translating, or coding — everything happens right on your device. And when you want to connect to the cloud, simply switch to ChatGPT API mode for even more powerful, up-to-date answers. Key Features: - Runs Locally — Experience lightning-fast chat without internet or server delay. - Optionally, Connect to by ChatGPT API — Access the world’s smartest AI whenever you want. - Beautiful Modern Design — A clean, elegant interface built for clarity and focus. - Instant Responses — No waiting. No spinning wheels. Just smooth conversation. - Completely Private — Your data stays on your device. Nothing leaves your phone. - Seamless Mode Switching — Toggle between local AI and ChatGPT in one tap. Why You’ll Love It: Because it’s your AI — fast, powerful, private, and beautifully crafted. Talk, create, think, and explore ideas anywhere — even offline. Download now and experience the future of AI — FAST. PRIVATE. BEAUTIFUL. LOCAL.

About

Lumo AI by Proton

This AI assistant prioritizes your privacy, offering help with productivity, curiosity, and staying informed. Developed by the team behind trusted encrypted services, it ensures your data remains secure.

Highlights
  • Privacy-first AI assistant
  • Boost productivity
  • Satisfy curiosity
  • Stay informed
  • Secure data handling
Read full 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

Vector Space AI3 screens
Lumo AI by Proton4 screens

Verdict

The call

The clearest difference is review sentiment: Vector Space AI at 100% against Lumo AI by Proton's 46%. Vector Space AI also leads on in-app purchases (none vs 2) and update cadence (every 4 days vs every 11 days). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Lumo AI by Proton sells 2 in-app purchases, starting at $12.99 per month. Vector Space AI asks for nothing beyond the download.

UpkeepUpdate frequency

Vector Space AI ships an update every 4 days, Lumo AI by Proton every 11 days. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 6 level
Vector Space AI versus Lumo AI by Proton: the parameters behind the verdict, then further details
ParameterVector Space AILumo AI by Proton
PriceFreeFree
Rating—3.8 (525 ratings) — better
Positive reviews100.0% of reviews — better45.5% of reviews
Number of ratings—525 — better
Update frequencyEvery 4 days — betterEvery 11 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.6 — better
Further details — not scored
Size34 MB96 MB
Age rating4+4+
DeveloperVoila Tech K.KProton AG

Customer experience

Vector Space AI

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Lumo AI by Proton

All ratings525 ratings
Positive66.5%
Neutral11.0%
Negative22.5%
Written reviews567 reviews
Positive45.5%
Neutral18.5%
Negative36.0%

Bugs and requests

Vector Space AI

Not enough reviews yet to summarise bugs or requests.

Lumo AI by Proton

Reported bugs

2 issues
  • Slow sign-in page
  • Lack of real-time data access

Requested features

5 requests
  • Dynamic Type support for adjustable font size
  • Secure access to Proton Drive files
  • Ghost mode to ensure no chat history is saved
  • Intuitive history clearing option
  • App mode

In-app purchases

None

Vector Space AI

No in-app purchases

2 purchases

Lumo AI by Proton

Subscriptions2
  • Lumo Plus (1 month)$12.991 Month
  • Lumo Plus (12 months)$119.991 Year

Questions

Is Vector Space AI free?
Vector Space AI is free to download, with no in-app purchases.
Is Lumo AI by Proton free?
Lumo AI by Proton is free to download, with in-app purchases available.
Do Vector Space AI or Lumo AI by Proton have ads?
Neither Vector Space AI nor Lumo AI by Proton shows ads.
Which is updated more often, Vector Space AI or Lumo AI by Proton?
Vector Space AI ships an update every 4 days, and Lumo AI by Proton every 11 days. Most recently, Vector Space AI was updated on October 8, 2026 and Lumo AI by Proton on October 16, 2026.

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