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Grok vs Lumo

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

Verdict

Grok and Lumo are both AI Assistants tools. Grok scores higher in FinderAtlas's editorial review (8.3 vs 7.6 out of 10). Both have a free plan or trial. Only Grok offers an API.

Best overall

Grok

  • Everyday users
  • Developers
  • Researchers
  • Content creators

Choose Grok if

  • You want a tool built for questions that need current information from X and the web.
  • Searches both X posts and the web for current information.
  • Free tier available without a subscription.

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
Grok
Best for business
Lumo

Features

17 features compared.

  • Live Search
    Grok
    Available
    Lumo
    Not available
  • Chat and Reasoning
    Grok
    Available
    Lumo
    Not available
  • File and Image Analysis
    Grok
    Available
    Lumo
    Not available
  • Grok Imagine
    Grok
    Available
    Lumo
    Not available
  • Voice Mode
    Grok
    Available
    Lumo
    Not available
  • Conversation Import
    Grok
    Available
    Lumo
    Not available
  • Shared Subscription
    Grok
    Available
    Lumo
    Not available
  • xAI API
    Grok
    Available
    Lumo
    Not available
  • Zero-Access Encrypted Chats
    Grok
    Not available
    Lumo
    Available
  • Open-Source Models
    Grok
    Not available
    Lumo
    Available
  • Web Search
    Grok
    Not available
    Lumo
    Available
  • Image Generation and Editing
    Grok
    Not available
    Lumo
    Available
  • Projects
    Grok
    Not available
    Lumo
    Available
  • Custom Lumos
    Grok
    Not available
    Lumo
    Available
  • Proton Drive Integration
    Grok
    Not available
    Lumo
    Available
  • Guest Mode
    Grok
    Not available
    Lumo
    Available
  • Memory and Personalization
    Grok
    Not available
    Lumo
    Available

Pricing

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

  • Pricing model
    Grok
    Freemium
    Lumo
    Freemium
  • Free plan
    Grok
    Yes
    Lumo
    Yes
  • Starting price
    Grok
    $0
    Lumo
    $0
  • Plans
    Grok
    5 plans
    Lumo
    2 plans

Grok plans

  • Free

    $0

    Capped use of Grok on grok.com, X and the apps.

    • Limited prompts
    • Basic models

  • Plus

    $8/month

    Entry plan with a shared usage pool across Grok, the API, Cursor and X.

    • Grok Chat
    • Voice
    • Imagine and Build
    • Grok API
    • Cursor
    • Fewer X timeline ads
    • Premium checkmark

  • Premium

    Most popular

    $30/month

    4x the usage of Plus with the latest models.

    • 4x Plus usage
    • Latest Grok models
    • Image and video generation
    • Cloud agents and automations
    • Ad-free X on most surfaces

  • Super

    $100/month

    15x the usage of Plus.

    • 15x Plus usage
    • 1080p video
    • Priority model access at peak times

  • Ultra

    $200/month

    50x the usage of Plus.

    • 50x Plus usage
    • Most powerful chat models
    • Earliest access to new products and models

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.

Grok
8.3overall
Lumo
7.6overall

Grok leads in 0 categories and Lumo in 0, with 1 tied.

  • Real-time Information Access

    Grok
    8.8
    Lumo
    Not rated

  • Image and Video Generation

    Grok
    8.2
    Lumo
    Not rated

  • Reasoning & Math

    Grok
    8.5
    Lumo
    Not rated

  • Coding & Syntax

    Grok
    8.3
    Lumo
    Not rated

  • Value for Money

    Tied
    Grok
    7.5
    Lumo
    7.5

  • Ease of Use

    Grok
    Not rated
    Lumo
    8.5

  • Feature Depth

    Grok
    Not rated
    Lumo
    7.0

  • Performance & Speed

    Grok
    Not rated
    Lumo
    7.2

  • Documentation & Support

    Grok
    Not rated
    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

Grok

Pros

  • Searches both X posts and the web for current information
  • Free tier available without a subscription
  • Image and video generation in the same app as chat
  • Separate API with long context windows (up to 1M tokens on some models)
  • Real-time voice mode in the mobile apps

Cons

  • Free usage is capped, and xAI does not publish the exact limit
  • Usage limits are given only as multiples of the Plus plan, not as fixed numbers
  • Answers drawing on X posts can reflect unverified social content
  • The App Store rates the app 16+ because of mature themes

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
    Grok
    Supported
    Lumo
    Supported
  • Windows
    Grok
    Not supported
    Lumo
    Not supported
  • macOS
    Grok
    Not supported
    Lumo
    Not supported
  • iOS
    Grok
    Supported
    Lumo
    Supported
  • Android
    Grok
    Supported
    Lumo
    Supported
  • API
    Grok
    Supported
    Lumo
    Not supported
  • Browser Extension
    Grok
    Not supported
    Lumo
    Not supported

Integrations

Grok

No integrations listed.

Lumo

1 integration
  • Proton Drive

Company

  • Company
    Grok
    xAI
    Lumo
    Proton AG
  • Founded
    Grok
    2023
    Lumo
    2014
  • Headquarters
    Grok
    Not listed
    Lumo
    Geneva, Switzerland
  • Listing
    Grok
    Claimed
    Lumo
    Claimed

Frequently asked questions

Is Grok better than Lumo?

It depends on your workflow. Grok is built for questions that need current information from X and the web. 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 Grok and Lumo?

Grok: xAI's AI assistant with live X and web search, image and voice tools. Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging. Grok is rated 4.0/5 from 1 user review.

Does Grok or Lumo have a free plan?

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

Which is cheaper, Grok or Lumo?

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