Knockout API vs VideoBGNinja

Knockout API provides image and video processing through a browser app and API. Its image tools cover background removal and replacement, batch processing, masking, smart crop, stickers, outlines, shadows, and inpainting; the API also handles upscaling, portrait restoration, colorization, and object removal. Video background removal runs asynchronously, with job polling for progress. The browser Canvas supports layered designs with text and effects, and users can save canvases and cutouts to a free account. Developers can connect through REST, any HTTP client, or official Node, React, Python, and CLI options. The service says it manages GPU processing, endpoint updates, usage records, credentials, teams, and billing. Its privacy policy says uploaded images are processed in GPU worker memory, not retained after the response, and not used to train models. The Free plan is free, with 30 images per month and 60 requests per minute. Pay-as-you-go is $0.02 a month, with metered usage billed monthly; Plus is $10 a month. Paid tiers have no monthly cap and a 600-request-per-minute limit.

VideoBGNinja is a web tool for removing backgrounds from short videos of people without a green screen or account. Its AI matting separates the person frame by frame and follows that subject through the clip. You can upload MP4, MOV, WebM, MKV, AVI, M4V, MPG, MPEG, WMV, or 3GP files. Outputs include transparent WebM, transparent GIF, green-screen MP4, and alpha-matte MP4; paid passes also provide ProRes 4444 MOV with alpha. The free plan costs nothing and handles clips up to 90 seconds, 2 GB, and 1920 px on the longest side. A free e-mail pass offers four minutes, 4 GB, and 2560 px. Paid passes cost €3 as a one-time purchase for 24 hours or €5, paid once for 30 days, raising limits to four minutes, 4 GB, and 3840 px. Processing runs in the Netherlands, with uploads deleted after processing.