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Duck.ai vs Lumo

Features, pricing, ratings, and pros and cons, side by side.

Verdict

Duck.ai and Lumo are both AI Assistants tools. Duck.ai scores higher in FinderAtlas's editorial review (7.8 vs 7.6 out of 10), led by ease of use and value for money. Both have a free plan or trial. Only Lumo is available on iOS and Android.

Best overall

Duck.ai

  • Privacy-conscious users
  • Casual AI chatbot users
  • Professionals handling sensitive information
  • Users comparing multiple AI models

Choose Duck.ai if

  • You want a tool built for everyday questions and drafting where you do not want chats tied to an account or used for training, and trying several models in one place.
  • Free tier works without an account.
  • Personal metadata such as IP address is removed before prompts reach providers.

Choose Lumo if

  • You want a tool built for everyday AI chat, web-assisted questions, document and image work without conversation logging or training on user data.
  • Zero-access encryption on saved chats, with a stated no-logging policy.
  • Open-source code and open-source models that can be inspected.
Best for beginners
Duck.ai
Best for business
Lumo

Features

18 features compared.

  • Multi-model chat
    Duck.ai
    Available
    Lumo
    Not available
  • No account required
    Duck.ai
    Available
    Lumo
    Not available
  • Metadata removal
    Duck.ai
    Available
    Lumo
    Not available
  • No training on chats
    Duck.ai
    Available
    Lumo
    Not available
  • Local recent chats
    Duck.ai
    Available
    Lumo
    Not available
  • Voice chat
    Duck.ai
    Available
    Lumo
    Not available
  • Image generation
    Duck.ai
    Available
    Lumo
    Not available
  • File and image upload
    Duck.ai
    Available
    Lumo
    Not available
  • Subscription bundle
    Duck.ai
    Available
    Lumo
    Not available
  • Zero-Access Encrypted Chats
    Duck.ai
    Not available
    Lumo
    Available
  • Open-Source Models
    Duck.ai
    Not available
    Lumo
    Available
  • Web Search
    Duck.ai
    Not available
    Lumo
    Available
  • Image Generation and Editing
    Duck.ai
    Not available
    Lumo
    Available
  • Projects
    Duck.ai
    Not available
    Lumo
    Available
  • Custom Lumos
    Duck.ai
    Not available
    Lumo
    Available
  • Proton Drive Integration
    Duck.ai
    Not available
    Lumo
    Available
  • Guest Mode
    Duck.ai
    Not available
    Lumo
    Available
  • Memory and Personalization
    Duck.ai
    Not available
    Lumo
    Available

Pricing

Plans as listed by each vendor. Check their sites for current prices.

  • Pricing model
    Duck.ai
    Freemium
    Lumo
    Freemium
  • Free plan
    Duck.ai
    Yes
    Lumo
    Yes
  • Starting price
    Duck.ai
    $0
    Lumo
    $0
  • Plans
    Duck.ai
    3 plans
    Lumo
    2 plans

Duck.ai plans

  • Free

    $0

    No-account access to smaller models within daily limits

    • Text chat
    • Voice chat
    • Image generation
    • Daily usage limits

  • Plus

    Most popular

    $9.99/month

    DuckDuckGo subscription with advanced models and privacy bundle

    • Advanced models
    • Reasoning models
    • VPN
    • Personal Information Removal
    • Identity Theft Restoration

  • Pro

    $19.99/month

    Highest reasoning models and doubled usage

    • Everything in Plus
    • Claude Opus access
    • Highest reasoning effort
    • 2x Plus usage limits

Lumo plans

  • Lumo Free

    $0

    Limited free access, no credit card required

    • Limited Max model usage
    • limited messages and chat history
    • limited image generations
    • 1 Project

  • Lumo Plus

    Most popular

    $12.99/month

    Individuals who want higher limits

    • More Max model usage
    • more messages and chat history
    • more image generations
    • unlimited Projects
    • unlimited Custom Lumos

Our ratings

Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.

Duck.ai
7.8overall
Lumo
7.6overall

Duck.ai leads in 3 categories and Lumo in 1, with 1 tied.

  • Ease of Use

    Duck.ai leads by 0.5
    Duck.ai
    9.0
    Lumo
    8.5

  • Feature Depth

    Tied
    Duck.ai
    7.0
    Lumo
    7.0

  • Value for Money

    Duck.ai leads by 0.5
    Duck.ai
    8.0
    Lumo
    7.5

  • Performance & Speed

    Duck.ai leads by 0.3
    Duck.ai
    7.5
    Lumo
    7.2

  • Documentation & Support

    Lumo leads by 0.3
    Duck.ai
    7.5
    Lumo
    7.8

Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.

Pros and cons

Duck.ai

Pros

  • Free tier works without an account.
  • Personal metadata such as IP address is removed before prompts reach providers.
  • Chats are not used for training by DuckDuckGo, and providers agree not to train on them.
  • Several providers' models are available from one interface.
  • Plus ($9.99/month) bundles a VPN and identity protection services.

Cons

  • Free tier is limited by daily usage caps, and the paid limits are not published as numbers.
  • Strongest models are subscriber-only, and the top tier costs $19.99/month.
  • No public API and no standalone mobile app found.
  • Chat history is local by default, so it does not sync across devices without opting into Sync & Backup.

Lumo

Pros

  • Zero-access encryption on saved chats, with a stated no-logging policy.
  • Open-source code and open-source models that can be inspected.
  • Permanent free tier with guest access and no credit card.
  • Web, iOS and Android apps.
  • Run by Proton AG, a Swiss company, and stated to comply with GDPR.

Cons

  • Free chat history is kept for only 7 days.
  • Uses open-source models rather than the proprietary frontier models of larger rivals.
  • No desktop app or public API found.
  • Lumo Plus limits are described only as "more" than Free, not as numbers, and the plan costs $12.99/month ($9.99/month billed annually).

Platforms

  • Web
    Duck.ai
    Supported
    Lumo
    Supported
  • Windows
    Duck.ai
    Not supported
    Lumo
    Not supported
  • macOS
    Duck.ai
    Not supported
    Lumo
    Not supported
  • iOS
    Duck.ai
    Not supported
    Lumo
    Supported
  • Android
    Duck.ai
    Not supported
    Lumo
    Supported
  • API
    Duck.ai
    Not supported
    Lumo
    Not supported
  • Browser Extension
    Duck.ai
    Not supported
    Lumo
    Not supported

Integrations

Duck.ai

2 integrations
  • DuckDuckGo Search
  • DuckDuckGo Browser

Lumo

1 integration
  • Proton Drive

Company

  • Company
    Duck.ai
    DuckDuckGo
    Lumo
    Proton AG
  • Founded
    Duck.ai
    2008
    Lumo
    2014
  • Headquarters
    Duck.ai
    Paoli, PA
    Lumo
    Geneva, Switzerland
  • Listing
    Duck.ai
    Claimed
    Lumo
    Claimed

Frequently asked questions

Is Duck.ai better than Lumo?

It depends on your workflow. Duck.ai is built for everyday questions and drafting where you do not want chats tied to an account or used for training, and trying several models in one place. Lumo is built for everyday AI chat, web-assisted questions, document and image work without conversation logging or training on user data.

What are the key feature differences between Duck.ai and Lumo?

Duck.ai: Chat with ChatGPT, Claude and other AI models without handing over your data. Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging.

Does Duck.ai or Lumo have a free plan?

Yes, both do. Duck.ai is freemium and Lumo is freemium, and each has a free plan or trial.

Which is cheaper, Duck.ai or Lumo?

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.