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Head to head · 2026

ChatGPT vs Lumo

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

ChatGPT

The product that took generative AI mainstream in late 2022

4.8$20/mo

Visit ChatGPT (opens ChatGPT 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: Lumo does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    ChatGPT

    4.8 against 4.0

  • Same job?

    Yes

    Both are Chatbots tools

Side by side

Compared onChatGPTLumo
Our rating4.8Better4.0
Starts at$20/moFree
Free planYesYes
CategoryChatbotsChatbots
Plans
  • FreeFree
  • Plus$20/mo
  • Team$25/user/mo
  • Free$0
  • Lumo PlusPrice shown at checkout
Key features
  • Broad, frequently updated GPT model family
  • Image generation, voice mode, and web browsing built in
  • Custom GPTs for configuring specialized assistants
  • File and image analysis
  • Largest user base of any chatbot
  • 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
  • Largest user base means the most third-party tutorials and integrations
  • Broad feature set covers text, voice, image, and file tasks in one app
  • Frequent model updates keep capabilities current
  • Free plan with no card
  • Chats are not used to train models, per Proton
  • Business edition for teams
Cons
  • Free tier usage limits are tighter than some competitors' free access
  • Scale and broad feature set can feel less focused than specialized tools
  • Higher-tier plans needed for the most current model versions
  • 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
CompanyOpenAI, founded 2022Proton AG, founded 2014

Prices come from each vendor's pricing page, last checked 20260629. Check the vendor before you buy.

FAQ

Questions people ask

Is ChatGPT better than Lumo?

In our reviews ChatGPT scores 4.8 and Lumo scores 4.0. The better pick depends on the job. ChatGPT: The product that took generative AI mainstream in late 2022. 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, ChatGPT or Lumo?

ChatGPT: from $20/mo. Lumo: free.

Do ChatGPT and Lumo have free plans?

Yes, both have a free plan.

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