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SPECIFICTION
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Knockout API

useknockout.com

From $0.02/mo Free plan WebAPI
Visit useknockout.com
Spec score 8.5 #19 of 94 in AI Background Removers

What it is

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.

Spec sheet

Purpose
Knockout provides image and video processing tools through a browser app and API.Read 29 Sep 2026 · useknockout.com
Audience
The site positions Free for evaluation, side projects, and open-source work; Pay-as-you-go for side projects and early startups; Plus for designers, agencies, and power users; and Volume for production workloads.Read 29 Sep 2026 · useknockout.com
Free plan
YesRead 20 Sep 2026 · useknockout.com
Integrations
Official client options include Node, React, Python, and CLI, alongside REST and any HTTP client.Read 29 Sep 2026 · useknockout.com
Security
The privacy policy says API tokens are SHA-256 hashed, passwords are managed by Supabase Auth using bcrypt, and traffic is encrypted via TLS.Read 29 Sep 2026 · useknockout.com
Compliance
The privacy policy says users in the EU/EEA have additional rights under GDPR and can contact the company about them.Read 29 Sep 2026 · useknockout.com
Support
The site lists community support for Free, email support for Pay-as-you-go, and Slack support for Volume.Read 29 Sep 2026 · useknockout.com
Design Studio
The browser Canvas supports layered designs with text and effects, and users can save canvases and cutouts to a free account.Read 29 Sep 2026 · useknockout.com
Enhancement
The API includes image upscaling, portrait restoration, colorization, and object removal.Read 29 Sep 2026 · useknockout.com
Image handling
The privacy policy says uploaded images are processed in GPU worker memory, not stored after the response, and not used for model training.Read 29 Sep 2026 · useknockout.com
Image tools
Its documented tools include background removal and replacement, batch processing, masking, smart crop, stickers, outlines, shadows, and inpainting.Read 29 Sep 2026 · useknockout.com
Operations
The service says it handles GPU processing, endpoint updates, usage records, credentials, teams, and billing, with GPU infrastructure powered by Modal.Read 29 Sep 2026 · useknockout.com
Performance
The site says warm background-removal calls are around 200ms for a 1024×1024 image, while a first request after idle can take longer as capacity starts.Read 29 Sep 2026 · useknockout.com
Usage limits
The docs list free usage at 60 requests per minute and 30 images each month, while paid tiers have a 600-request-per-minute limit and no monthly cap.Read 29 Sep 2026 · useknockout.com
Video
The API supports asynchronous video background removal with job polling.Read 29 Sep 2026 · useknockout.com

Plans and prices

Free Free Recurring, with no expiring signup grant 30 images/month Read 20 Sep 2026 · useknockout.com
Pay-as-you-go $0.02 a month Metered usage billed monthly All endpoints · PSD export available as an add-on · Video background removal at $0.10/output second · Email support Read 20 Sep 2026 · useknockout.com
Knockout Plus $10 a month billed monthly 250 images/month included Read 20 Sep 2026 · useknockout.com
Free Free 30 images every month · no card · /remove, /remove-url, /mask, /compare, /preview · community support Read 29 Sep 2026 · useknockout.com
Pay-as-you-go $0.02 a month Metered usage billed monthly All endpoints · PSD export $0.10/image · video background removal $0.10/output sec · email support Read 29 Sep 2026 · useknockout.com
Knockout Plus $10 a month Monthly 250 images included, then $0.02/image · layered PSD export included · video background removal $0.08/output sec · edge despill and saved presets · custom watermarks, resize and compression Read 29 Sep 2026 · useknockout.com
Volume Priced on request Negotiated per-image rate 100k+ images/mo · negotiated SLA available · Slack support · usage dashboard Read 29 Sep 2026 · useknockout.com

Every Knockout API plan and price →

Strong points and limits

Strong points

  • Offers image and video processing tools.
  • Official clients include Node, React, Python, and CLI.
  • Free plan includes 30 images per month.
  • Uploaded images are not used for model training, per policy.

Limits

  • Free usage is limited to 30 images monthly.
  • Free requests are limited to 60 per minute.
  • Video background removal is billed at $0.10 per output second on Pay-as-you-go.

Who it suits

The Free plan is positioned for evaluation, side projects, and open-source work. Pay-as-you-go is aimed at side projects and early startups, while Plus is positioned for designers, agencies, and power users.

Verdict

Knockout combines a broad image-tool set with asynchronous video background removal and multiple developer connection options. Compare the monthly image allowance and metered video charge with your workload before choosing a plan.

Where Specifiction places it

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