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Head to head · 2026

Arvin vs Lumo

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

Arvin

Browser extension and web app that puts GPT, Claude and Gemini chat, writing help, translation, PDF…

3.7Free

Visit Arvin (opens Arvin in a new tab)

Lumo

Proton's privacy-first AI chat assistant with zero-access encrypted chats, open-source code, web search and image generation,…

4.0Free

Visit Lumo (opens Lumo in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: Arvin does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    Lumo

    3.7 against 4.0

  • Same job?

    Yes

    Both are Chatbots tools

Side by side

Compared onArvinLumo
Our rating3.74.0Better
Starts atFreeFree
Free planYesYes
CategoryChatbotsChatbots
PlansFree
  • Free$0
  • Lumo PlusPrice shown at checkout
Key features
  • Chat in the browser through an extension with a keyboard shortcut
  • Access to GPT, Claude and Gemini models
  • Chat with PDF, AI search and email reply generation
  • Web page translation in 25+ languages
  • AI image generation and background removal
  • Zero-access encrypted chat history
  • Web search and small file uploads
  • Proton Drive files and folders as context
  • Image generation, projects and custom assistants
  • Open-source code and apps for iOS and Android
Pros
  • Daily free credits across several models
  • Works inside Gmail, LinkedIn and other sites
  • Writing, translation and design tools in one assistant
  • Free plan with no card
  • Chats are not used to train models, per Proton
  • Business edition for teams
Cons
  • Built on third-party models rather than its own
  • No prices published for paid plans
  • Daily credits limit heavy use on the free tier
  • Free plan limits model usage, history and images
  • Plus prices are not shown in the static page and vary by currency
  • Privacy claims rest on Proton's own documentation
CompanyIdealabs PTE. LTD.Proton AG, founded 2014

Prices come from each vendor's pricing page, last checked 20261012. Check the vendor before you buy.

FAQ

Questions people ask

Is Arvin better than Lumo?

In our reviews Arvin scores 3.7 and Lumo scores 4.0. The better pick depends on the job. Arvin: Browser extension and web app that puts GPT, Claude and Gemini chat, writing help, translation, PDF chat and image generation in one assistant, with daily free credits. Lumo: Proton's privacy-first AI chat assistant with zero-access encrypted chats, open-source code, web search and image generation, on web, iOS and Android.

Which is cheaper, Arvin or Lumo?

Arvin: free. Lumo: free.

Do Arvin and Lumo have free plans?

Yes, both have a free plan.

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