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Castaly vs Grok

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

Verdict

Castaly is listed under Image & Visual AI and Grok under AI Assistants. Grok scores higher in FinderAtlas's editorial review (8.3 vs 7.7 out of 10). Only Grok has a free plan or trial. Only Grok is available on iOS and Android.

Best overall

Grok

  • Everyday users
  • Developers
  • Researchers
  • Content creators

Choose Castaly if

  • You want a tool built for comparing several AI video and image models with public per-specification prices and paying only for what is generated.
  • Many video and image models from several makers in one studio.
  • Public price per specification, shown before generating.

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.
Best value
Grok
Best for beginners
Castaly
Best for business
Castaly

Features

16 features compared.

  • Multi-model video generation
    Castaly
    Available
    Grok
    Not available
  • Image generation
    Castaly
    Available
    Grok
    Not available
  • Public per-spec pricing
    Castaly
    Available
    Grok
    Not available
  • Pay per generation
    Castaly
    Available
    Grok
    Not available
  • Reference inputs
    Castaly
    Available
    Grok
    Not available
  • Community remix
    Castaly
    Available
    Grok
    Not available
  • API access
    Castaly
    Available
    Grok
    Not available
  • Creation records
    Castaly
    Available
    Grok
    Not available
  • Live Search
    Castaly
    Not available
    Grok
    Available
  • Chat and Reasoning
    Castaly
    Not available
    Grok
    Available
  • File and Image Analysis
    Castaly
    Not available
    Grok
    Available
  • Grok Imagine
    Castaly
    Not available
    Grok
    Available
  • Voice Mode
    Castaly
    Not available
    Grok
    Available
  • Conversation Import
    Castaly
    Not available
    Grok
    Available
  • Shared Subscription
    Castaly
    Not available
    Grok
    Available
  • xAI API
    Castaly
    Not available
    Grok
    Available

Pricing

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

  • Pricing model
    Castaly
    Paid
    Grok
    Freemium
  • Free plan
    Castaly
    No
    Grok
    Yes
  • Starting price
    Castaly
    Usage-based
    Grok
    $0
  • Plans
    Castaly
    2 plans
    Grok
    5 plans

Castaly plans

  • Pay-as-you-go

    Usage-based/usage-based

    Top up a shared USD wallet and pay per image, per second of video or per task.

    • No subscription
    • No minimum
    • Balance does not expire
    • Same wallet for Studio and API

  • Enterprise

    Custom/custom

    Volume pricing, higher limits, priority support and custom onboarding.

    • Volume pricing
    • Higher limits
    • Priority support

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

Our ratings

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

Castaly
7.7overall
Grok
8.3overall

  • Model Breadth

    Castaly
    8.3
    Grok
    Not rated

  • Pricing Clarity

    Castaly
    8.0
    Grok
    Not rated

  • Ease of Use

    Castaly
    7.5
    Grok
    Not rated

  • API Access

    Castaly
    7.8
    Grok
    Not rated

  • Transparency

    Castaly
    6.8
    Grok
    Not rated

  • Real-time Information Access

    Castaly
    Not rated
    Grok
    8.8

  • Image and Video Generation

    Castaly
    Not rated
    Grok
    8.2

  • Reasoning & Math

    Castaly
    Not rated
    Grok
    8.5

  • Coding & Syntax

    Castaly
    Not rated
    Grok
    8.3

  • Value for Money

    Castaly
    Not rated
    Grok
    7.5

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

Castaly

Pros

  • Many video and image models from several makers in one studio
  • Public price per specification, shown before generating
  • No subscription or minimum, and the wallet balance does not expire
  • Same account and wallet work for the studio and the API
  • Operator is named in the footer and Modelflare terms

Cons

  • Reseller of third-party models, so availability and pricing depend on upstream providers
  • No free tier or free credits described
  • Some models are priced per million tokens, which is harder to estimate than per second
  • Web only, with no mobile app
  • Castaly's own legal pages return 404; terms are on the Modelflare site

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

Platforms

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

Company

  • Company
    Castaly
    Havenbyte LLC
    Grok
    xAI
  • Founded
    Castaly
    Not listed
    Grok
    2023
  • Listing
    Castaly
    Claimed
    Grok
    Claimed

Frequently asked questions

Is Castaly better than Grok?

It depends on your workflow. Castaly is built for comparing several AI video and image models with public per-specification prices and paying only for what is generated. Grok is built for questions that need current information from X and the web.

What are the key feature differences between Castaly and Grok?

Castaly: Pay-per-generation AI video and image studio with Seedance, Kling, Wan and GPT Image. Grok: xAI's AI assistant with live X and web search, image and voice tools. Grok is rated 4.0/5 from 1 user review.

Does Castaly or Grok have a free plan?

Grok has a free plan or trial; Castaly is paid only.

Which is cheaper, Castaly or Grok?

Castaly starts at Usage-based and Grok starts at $0. See the pricing table above for what each tier includes.