EZ-CorridorKey vs Knockout API

EZ-CorridorKey9.0Visit Knockout API8.6Visit

Higher score EZ-CorridorKey #3 in Video Background Removal Software 9.0/10 Free plan Free plan✓ 2 of 4 features Visit EZ-CorridorKey

vs

Knockout API #7 in Video Background Removal Software 8.6/10 Free plan Free plan✓ 4 of 4 features Visit Knockout API

• EZ-CorridorKey fits best

  Private local chroma-key and matting

• Knockout API fits best

  Affordable video API with alpha output

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	EZ-CorridorKey 9.0/10 Visit ↗	Knockout API 8.6/10 Visit ↗
At a glance
Editor score	9.0	8.6
Ranking	#3 in Video Background Removal Software	#7 in Video Background Removal Software
Best for	Private local chroma-key and matting	Affordable video API with alpha output
Pricing model	Free	Free plan + paid
Starting price	Free	$10/mo
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop, Self-hosted	Cloud, Self-hosted
Platforms	Windows, macOS, Linux	Web
Support	Community, Docs	Email, Community, Docs, Live chat
Built for	Solo, Small business	Small business, Mid-market, Enterprise
Features EZ-CorridorKey 2/4 · Knockout API 4/4
Background replacement	Not checked yet	✓ (best)
Background blur	Not checked yet	✓ (best)
Transparent video export	✓	✓
Batch processing	✓	✓
Specs
Maximum resolution	Not checked yet	1080p
Maximum clip length	Not checked yet	30 min
Supported input formats	MOV, MP4, PNG, JPG, JPEG, TIF, TIFF, EXR	mp4, mov, avi, webm, mkv
Our review
Pros	Free local processing on Windows, macOS, and Linux AI matting, tracking, batch queues, and edge refinement Exports EXR, PNG, ProRes 4444, and VP9-alpha files	Real alpha-channel video output with ProRes 4444 and WebM export Background replacement, blur compositing, and image cutouts Free tier plus REST access and self-hosted deployment options
Cons	Focused on green- and blue-screen keying workflows No paid tiers for expanded plans or support options Desktop-oriented workflow may not suit cloud-based teams	Video clips are limited to 30 seconds and 1080p Video processing is available only on paid tiers Volume pricing and SLA terms require negotiation
Our verdict	EZ-CorridorKey is a free desktop application for filmmakers, visual-effects artists, and editors who need local green- or blue-screen keying without a command-line workflow. It provides a graphical interface for Corridor Digital’s… Read the review →	Knockout API provides hosted background-removal and image-processing endpoints for developers and product teams. Its scope covers video background removal with real alpha-channel output, background replacement using a color or image,… Read the review →

Strengths and trade-offs

• EZ-CorridorKey — where it wins

  • Free local processing on Windows, macOS, and Linux
  • AI matting, tracking, batch queues, and edge refinement
  • Exports EXR, PNG, ProRes 4444, and VP9-alpha files

  Where it doesn't

  • Focused on green- and blue-screen keying workflows
  • No paid tiers for expanded plans or support options
  • Desktop-oriented workflow may not suit cloud-based teams

• Knockout API — where it wins

  • Real alpha-channel video output with ProRes 4444 and WebM export
  • Background replacement, blur compositing, and image cutouts
  • Free tier plus REST access and self-hosted deployment options

  Where it doesn't

  • Video clips are limited to 30 seconds and 1080p
  • Video processing is available only on paid tiers
  • Volume pricing and SLA terms require negotiation

• EZ-CorridorKey9.0/10 · Free plan

  A free local matte-generation tool for filmmakers, editors, and visual-effects artists.

  Visit EZ-CorridorKeyFull verdict →
• Knockout API8.6/10 · Free plan

  An affordable API for alpha-channel video, image cutouts, and background compositing.

  Visit Knockout APIFull verdict →