# Castaly vs Runway

> Castaly: Pay-per-generation AI video and image studio with Seedance, Kling, Wan and GPT Image
> Runway: AI video, image and audio creation suite with Gen-4.5, agents and an API

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

## Verdict

Castaly and Runway are both Image & Visual AI tools. Runway scores higher in FinderAtlas's editorial review (8.4 vs 7.7 out of 10). Only Runway has a free plan or trial. Only Runway 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 Runway if

- You want a tool built for Text-to-video and image-to-video generation.
- Combines video, image and audio generation and editing in one workspace.
- Offers Runway's own Gen-4.5 plus third-party models such as Seedance 2.0.

## Pricing

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

## Features

| Feature | Castaly | Runway |
| --- | --- | --- |
| 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 |
| Gen-4.5 video model | Not listed | Yes |
| Creative Agent | Not listed | Yes |
| Multiple models | Not listed | Yes |
| Characters | Not listed | Yes |
| Aleph and Act-Two | Not listed | Yes |
| Audio tools | Not listed | Yes |
| Workflows and Recipes | Not listed | Yes |
| Runway Dev API | Not listed | Yes |
| Runway MCP | Not listed | Yes |

## Platforms

| Platform | Castaly | Runway |
| --- | --- | --- |
| 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

## Runway strengths

- Combines video, image and audio generation and editing in one workspace
- Offers Runway's own Gen-4.5 plus third-party models such as Seedance 2.0
- Creative Agent builds videos from a conversation
- Runway Dev API with Node and Python SDKs
- Free plan with 125 credits that do not expire
- Native iOS and Android apps

## Runway limitations

- Credit-based pricing: a 5-second Gen-4.5 clip costs 60 credits, so the 625 credits on Standard cover about 10 such clips
- Standard and Pro credits do not roll over at the end of the month
- Some App Store reviewers complain about the cost of failed or unusable generations
- 4K upscaling is unlimited only on Pro and Max

## FAQ

**Is Castaly better than Runway?**

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. Runway is built for Text-to-video and image-to-video generation.

**What are the key feature differences between Castaly and Runway?**

Castaly: Pay-per-generation AI video and image studio with Seedance, Kling, Wan and GPT Image. Runway: AI video, image and audio creation suite with Gen-4.5, agents and an API.

**Does Castaly or Runway have a free plan?**

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

**Which is cheaper, Castaly or Runway?**

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