Framecast

Framecast is a single-purpose tool, and it is honest about that, which is most of why it works. The problem it addresses is real and specific. Claude and other code generators are good at producing HTML animations that play beautifully in a browser tab, and completely useless the moment you want to post them. YouTube wants an MP4, TikTok wants an MP4, a client wants a file they can drop into a deck. The obvious move is a screen recorder, and the vendor's own guide lays out why that move degrades your work: a recorder captures your screen showing your animation, after GPU compositing, your monitor's colour profile and a real-time encoder have all had a turn. The usual casualties are dropped frames (a 60fps animation on a 60Hz display has zero headroom), gradient banding, and crushed colour and transparency. The virtual-clock render is the right answer to that. Framecast loads your file in a real browser engine and advances the clock one frame at a time — capture, advance, capture — so the output is decoupled from your hardware's ability to keep up. The same animation renders identically whether your laptop is idle or pinned. Where Framecast genuinely separates itself from the other frame-accurate route is the input. Export-ZIP tools give you a genuine frame render too, but they start by asking you to export a project and upload the bundle, and they only work when the animation matches the shape the tool expects. A standalone HTML file you pasted into an editor, a forked CodePen, a GSAP demo from a tutorial, a raw canvas sketch — those fall outside a project export entirely. Framecast takes one HTML file and renders it, which covers all of those cases plus the clean Claude artifact. Three aspect ratios from one drop is a practical win rather than a marketing one. You are not re-rendering for vertical, and the 9:16 and 1:1 versions come out of the same pass as the 16:9. The honest limits: it is a render engine, not a video editor. No timeline, no trimming, no audio. If your clip needs a music bed or a cut, you will be taking the Framecast MP4 into something else. The free preview is watermarked by design, so you judge quality before you spend, but you cannot post the preview. And per-video pricing is a poor fit for anyone rendering at volume — it rewards occasional use and punishes a batch workflow. Where it fits: developers and creators shipping code-built motion to social feeds, and anyone whose screen recording keeps dropping frames on a browser animation. Where it doesn't: editing work, high-volume pipelines, or animations that aren't self-contained HTML files.