This is an awesome tool! I created my own promo in Blender for a personal site project* some time ago and it was a real pain getting the screen content to render accurately and contrast well off of the device. Do you have any concerns with consistency across different devices/GPUs since you're doing everything client-side? Nice to see the attention to detail you put into this.
* https://twitter.com/dannygarcia/status/1220401033064484864