Paid
Added on Nov 13,2026
Sandcastles is an AI-powered research and scriptwriting tool for short-form video that helps creators and brands find viral content in their niche and remix it into their own scripts.
It lets you discover successful channels across Instagram, TikTok and YouTube Shorts and build a custom feed to track them in one place. A database of millions of validated outlier videos helps you find the top performing content in any niche.
For each video, Sandcastles gives an in-depth analysis of the hook, storytelling, format and style to explain why it went viral and how to recreate that success. You can also download the transcript of any video.
Key features include a hook generator based on templates with millions of views, a script writer that uses proven storytelling frameworks, projects and collections to organise ideas, personal analytics for your own content, content strategy audits for your channels and competitor research feeds.
It offers an MCP connector on all plans and API access on the top tier. Connecting your social accounts is optional but helps tailor insights.
Pricing: Pro costs 49 USD per month or 39 USD per month billed yearly, with 100 credits a month and up to 150 tracked competitors per workspace. Visionary costs 99 USD per month (79 USD yearly) with 250 credits. Titan costs 499 USD per month (399 USD yearly) with 1,500 credits, API access and guest workspace access for agencies. Credits are used for analysing videos, writing scripts and running reports.
It is suited to content creators, social media managers, agencies and brands that publish short-form video on Instagram Reels, TikTok and YouTube Shorts.
Popular alternatives to Sandcastles include SynthLife, ImageToCaption and Predis.ai. Compare their pricing and what each is best for below.
| Tool | Pricing | Best for |
|---|---|---|
| SynthLife | Freemium | Creators and marketers who want to run a faceless virtual influencer account on TikTok and Instagram without filming the... |
| ImageToCaption | Free Trial | Social media managers, agencies and small business owners who need on-brand captions for photo and video posts. |
| Predis.ai | Free Trial | Social media managers and small e-commerce brands who need regular ad creatives and posts built from a product link or p... |
| Thumbnail Ai | Freemium | YouTube creators who want feedback and alternatives for a thumbnail before publishing. |
| ROBOPOST Social | Freemium | Social media managers and small agencies who schedule content across several networks and want AI help drafting captions... |
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