# Castaly vs 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

- Castaly profile: https://finderatlas.com/tools/castaly
- Grok profile: https://finderatlas.com/tools/grok
- Comparison page: https://finderatlas.com/compare/castaly-vs-grok
- Last reviewed: October 2026

## 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.

### 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.

## Pricing

| | Castaly | Grok |
| --- | --- | --- |
| Pricing model | Paid | Freemium |
| Free plan or trial | No | Yes |
| Starting price | Usage-based | $0 |

## Features

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

## Platforms

| Platform | Castaly | Grok |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | No | No |
| macOS | No | No |
| iOS | No | Yes |
| Android | No | Yes |
| API | Yes | Yes |
| Browser Extension | No | No |

## Castaly strengths

- 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

## Castaly limitations

- 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 strengths

- 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

## Grok limitations

- 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

## FAQ

**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.