If you're looking for another Unscreen alternative, Media.io is worth a look. It's a broad collection of AI-based video, audio and image editing tools. Media.io's site includes an AI Background Remover that can remove backgrounds from video automatically so content creators can spruce up their projects quickly. It can handle lots of formats and can process video in batches, too, so you can process lots of videos at once.
Another good option is AVCLabs. It's a collection of AI tools to improve video quality and remove backgrounds. AVCLabs' Video Background Remover AI tool removes backgrounds without a green screen, just like Unscreen. It's got other useful tools, too, like upconverting resolution, denoising and restoring facial detail, so it's good for both beginners and pros.
If you want more than just background removal, Cutout.Pro is a more powerful collection of AI tools for image and video editing. It's got tools for automatic background removal, video upscaling, denoising, facial detail restoration, and AI art generation. It's also got an API so developers can incorporate the tools into their own apps, which can be useful for developers and content creators who need to process video at high speed.
Last, VEED is a free browser-based AI video editor that could be a good alternative. VEED has some advanced features like text-to-video, auto-subtitles and AI-generated avatars, so it's good for making videos that look pro even if you don't have much video editing experience. It can handle lots of formats and aspect ratios, and its interface is easy to use to make videos that look good.