HTML to video vs. screen recording
Same animation, two ways to capture it. Screen recording copies whatever your monitor painted in real time — stutters and all. Framecast renders each frame on its own. Here's the same clip, both ways:
Why screen recording drops frames
A screen recorder is a passenger: it grabs whatever the display shows, at whatever moment it can, in real time. Three things go wrong with animation:
- Refresh-rate mismatch. A 60fps animation on a 60Hz display leaves no headroom. Any hiccup means a missed frame, and the recorder saves the gap.
- CPU contention. The recorder, the browser, and the animation all fight for the same cores. The animation loses, and you see stutter.
- Compression on the fly. Real-time encoders cut corners under load — that's where gradient banding and crushed transparency come from.
How a frame-by-frame render fixes it
Framecast isn't a passenger — it drives the clock. It loads your HTML in a real browser engine and advances a deterministic virtual clock one frame at a time, capturing each frame at full quality before moving on. Time is decoupled from your hardware, so the render is identical whether your laptop is idle or busy. Every frame makes it into the video, so motion comes out smooth with no gaps.
| Screen recording | Framecast render | |
|---|---|---|
| Dropped frames | Common | None |
| Gradient banding | Likely | Clean |
| Timing accuracy | Real-time, varies | Frame-exact |
| Max resolution | Your screen | 1080p (4K coming soon) |
| Watermark | None (but quality suffers) | None |
| Multiple aspect ratios | Re-record each | 16:9, 9:16 & 1:1 in one drop |
| Setup | Recorder + cropping + re-encode | Drop one HTML file |
When screen recording is fine
If you just need a throwaway clip for a Slack message, screen recording is quicker and free. Framecast earns its $2.99 when the clip is going somewhere that matters — a launch, a portfolio, a paid post, a thumbnail-worthy Short — where "looks rendered" beats "looks recorded."
Working from a Claude animation specifically? The complete guide to turning a Claude HTML animation into an MP4 walks through the whole thing, including why dropping any HTML beats the export-ZIP route.