Knockout API vs PixelZap

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.

PixelZap is an on-device AI tool for removing video backgrounds and creating cutouts from people, products, photos, and GIFs. For video, it can remove or replace moving backgrounds without a physical green screen; replacement choices include a color, image, video, or gradient. Photo tools make product photos, profile pictures, transparent PNGs, and sticker-ready cutouts. GIF editing removes backgrounds and can produce animated cutouts with new scenes or outlines. Finishing tools include outlines, strokes, neon glow, trimming, cropping, merging, and compression. The product page also lists a video converter and audio extractor. PixelZap says background removal runs on the device and does not require media uploads to a cloud server. It is presented for personal and product media, supports MP4, MOV, AVI, and MKV video input, and is available on Android, iOS, and macOS. The Free plan is listed at free, and the page describes AI video background removal as free. It does not state usage limits.