Knockout API vs Backdrop

Knockout API9.2Visit Backdrop8.7Visit

Higher score Knockout API #3 in Green Screen Software 9.2/10 Free plan Free plan✓ 1 of 4 features Visit Knockout API

vs

Backdrop #8 in Green Screen Software 8.7/10 Paid ✓ 3 of 4 features Visit Backdrop

• Knockout API fits best

  Developers needing flexible alpha-video processing

• Backdrop fits best

  API-first teams processing short clips

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Side by side

Feature	Knockout API 9.2/10 Visit ↗	Backdrop 8.7/10 Visit ↗
At a glance
Editor score	9.2	8.7
Ranking	#3 in Green Screen Software	#8 in Green Screen Software
Best for	Developers needing flexible alpha-video processing	API-first teams processing short clips
Pricing model	Free plan + paid	Paid
Starting price	$10/mo	$9 one-time
Free plan	✓ (best)	—
Free trial	—	—
Deployment	Cloud, Self-hosted	Cloud
Platforms	Web	Web
Support	Email, Community, Docs, Live chat	Email, Docs
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Knockout API 1/4 · Backdrop 3/4
AI background removal	Not checked yet	✓ (best)
Transparent export	Not checked yet	✓ (best)
Batch processing	✓ (best)	Not checked yet
API access	Not checked yet	✓ (best)
Specs
Input media	Not checked yet	Video
Max export resolution	Not checked yet	Not checked yet
Max video length	Not checked yet	5 min
Our review
Pros	Real alpha-channel output with ProRes 4444 and WebM export Background replacement, blur compositing, and image cutouts Open-source API with REST, SDK, CLI, and self-hosting options	Removes people from video without requiring a green screen Exports transparent WebM, MP4, and raw alpha mattes Supports REST jobs, webhooks, and signed download URLs
Cons	Video processing is limited to 1080p and 30-second clips Video background removal is available only on paid tiers Free plan is limited to 30 images per month	Videos are limited to 5 minutes during beta Designed for people rather than products, pets, or cars Paid plans use one-time processing allocations
Our verdict	Knockout API is a hosted, open-source background-processing API for developers and product teams. It handles video background removal with real alpha-channel output, image cutouts, background replacement, blur compositing, portrait… Read the review →	Backdrop is a web-based video background removal workspace for creators, editors, social teams, educators, and product teams. It separates people from their surroundings without requiring a green screen, then supports transparent WebM… Read the review →

Strengths and trade-offs

• Knockout API — where it wins

  • Real alpha-channel output with ProRes 4444 and WebM export
  • Background replacement, blur compositing, and image cutouts
  • Open-source API with REST, SDK, CLI, and self-hosting options

  Where it doesn't

  • Video processing is limited to 1080p and 30-second clips
  • Video background removal is available only on paid tiers
  • Free plan is limited to 30 images per month

• Backdrop — where it wins

  • Removes people from video without requiring a green screen
  • Exports transparent WebM, MP4, and raw alpha mattes
  • Supports REST jobs, webhooks, and signed download URLs

  Where it doesn't

  • Videos are limited to 5 minutes during beta
  • Designed for people rather than products, pets, or cars
  • Paid plans use one-time processing allocations

• Knockout API9.2/10 · Free plan

  A developer-focused background API with alpha video output and self-hosting.

  Visit Knockout APIFull verdict →
• Backdrop8.7/10 · Paid

  A focused API and web tool for removing people from video backgrounds.

  Visit BackdropFull verdict →