Castaly
Pay-per-generation AI video and image studio with side-by-side model comparison and a public community gallery.
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Castaly suits developers and cost-conscious creators who want to run multiple AI video models from one browser interface and pay only for what they actually generate. The pay-as-you-go wallet model is genuinely flexible, but there is no free tier and no subscription option, which makes it harder to budget for high-volume creative work compared to Runway's fixed monthly plans. Teams that need avatar-based video, talking-head output, or video translation should look at HeyGen instead.
What is Castaly?
Castaly is an AI video platform that brings multiple leading video generation models together in one workspace. Creators and marketers generate clips from text or images and pay only for what they use, with no subscription required.
How we scored Castaly
Capability scores 18 because Castaly covers text-to-video and image generation across a genuinely useful roster of models (MiniMax-H3, Kling 3.0, Wan, Seedance, multiple Gemini and GPT image models) with real parameter control, but it has no avatar, talking-head, or translation capability that both HeyGen and Runway offer, which is a meaningful gap for a video tool. Ease of use scores 17 because the pre-generation price display and community gallery lower the learning curve, but the absence of any free tier or trial credits means new users must commit money before they can evaluate the interface at all. Value scores 16 because the pay-per-generation model is genuinely fair for occasional users, but MiniMax-H3 at $0.1521 per second at 2K means a 30-second clip costs over $4.50 from a single model, and with no subscription ceiling, costs for regular creators can exceed Runway's fixed monthly plans quickly. Delivery scores 15 because no independent user reviews were found, the only published first-person account is from the tool's own developer, and the community gallery and API claims could not be verified against third-party sources before publication.
Pros and cons
What we liked
- Prices are shown per specification before you generate, so there are no surprise charges after the fact.
- One shared USD wallet covers both the browser studio and direct Modelflare API calls, eliminating duplicate account management for developers.
- The public community gallery exposes full prompts and generation settings for every shared result, making it genuinely useful for learning which model and parameters produced a given output.
Where it falls short
- No free tier and no trial credits: you must top up the wallet before generating a single frame, which creates friction for anyone evaluating the platform before committing money.
- The per-second billing model makes it difficult to forecast monthly spend for high-volume work, since costs compound with resolution and duration choices in ways that are not obvious until you have run several generations.
- The model roster covers text-to-video and image generation but has no avatar, talking-head, or video translation capability, which are standard features in competing platforms like HeyGen.
Key features
Castaly pricing
Strictly pay-as-you-go. Funds load into a shared USD wallet used for both the web studio and direct API calls. No subscription, no minimum spend, and the wallet balance does not expire. Prices vary by model and specification: MiniMax-H3 video at 2K resolution costs $0.1521 per second; at 768p it costs $0.0936 per second. Image generation via gemini-2.5-flash-image runs $0.033 per request. An Enterprise tier with higher limits, priority support, and volume pricing is available for teams.
| Plan | Price | Who it is for |
|---|---|---|
| Pay-per-generation (standard) | No subscription fee | Access to all models in the studio and via the Modelflare API. Charged per generation from a prepaid USD wallet. MiniMax-H3 video at 2K costs $0.1521/second; at 768p costs $0.0936/second. gemini-2.5-flash-image costs $0.033 per request. Wallet balance does not expire. No minimum spend. |
| Enterprise | Contact for pricing | Higher rate limits, priority support, and volume pricing for teams using the studio and Modelflare API. Pricing negotiated directly. |
Pricing reflects what we saw at time of review (2026-10). Always confirm current pricing on the tool's own site.
Who should use Castaly?
Castaly fits a developer who wants to call multiple video generation models from one API endpoint without managing separate accounts, or a solo creator who generates video occasionally and does not want to pay a monthly subscription for credits they may not use. The pay-per-generation model is genuinely useful for someone whose output volume swings month to month: a freelancer who has three heavy production weeks and then nothing for a month pays only for those three weeks.
If you need avatar-based video, talking-head clips, or AI-powered video translation, Castaly does not offer those capabilities and HeyGen is the right tool. If you want a fixed monthly budget with a generous included credit pool and a full non-linear editing environment, Runway's subscription plans give you more predictable costs and a deeper editing toolkit.
Skip it if: Teams needing avatar or talking-head video, or anyone who wants a predictable monthly cost cap.
Frequently asked questions
Is there a free trial or free tier?+
No. Castaly has no free plan and no trial credits. You must add funds to the USD wallet before generating any video or image.
How does billing work exactly?+
You top up a shared USD wallet. Each generation deducts the cost based on the model, resolution, duration, and quality you selected. The price is shown before you confirm the generation, and the wallet balance never expires.
Can I use the same account for API access?+
Yes. The Modelflare API uses the same wallet and the same public prices as the browser studio. There is no separate API account or second wallet to manage.
Which video models are available?+
The studio includes MiniMax-H3, Kling 3.0, Wan, and Seedance for video, plus image models including gemini-2.5-flash-image, gpt-image-2, and several Gemini variants. The full list with per-unit prices is on the pricing page.
What does the community gallery offer?+
The gallery shows publicly shared AI-generated video and images with the full prompt and generation settings attached. Anyone can browse it without signing in, and any result can be copied or remixed directly in the studio.
Is there a plan for teams or agencies?+
Yes. An Enterprise tier provides higher rate limits, priority support, and volume pricing. Pricing is not listed publicly and requires contacting Castaly directly.
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