Imposter vs Knockout API
Imposter
imposter.shKnockout API
useknockout.comSide by side
| Figure | Imposter | Knockout API |
|---|---|---|
| Price from | — | $0.02/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 7 |
| Spec score · API Mocking Tools | 7.6 (#15) | 8.4 (#7) |
| Audience | The maker presents Imposter for developers, including API developers, and highlights development and QA use cases. | 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. |
| Integrations | The CLI documentation describes embedding Imposter in JVM and Node.js tests, and using GitHub Actions or other CI/CD platforms including GitLab, CircleCI, Jenkins, Azure Pipelines, and Bitbucket. | Official client options include Node, React, Python, and CLI, alongside REST and any HTTP client. |
| Purpose | Imposter runs interactive mock systems for development and QA, including before a real API is available. | Knockout provides image and video processing tools through a browser app and API. |
| Security | Imposter supports HTTPS through TLS configuration and can authenticate incoming HTTP requests using configured request conditions such as header values. | The privacy policy says API tokens are SHA-256 hashed, passwords are managed by Supabase Auth using bcrypt, and traffic is encrypted via TLS. |
Plans
Knockout API
- FreeFree
- Pay-as-you-go$0.02 a month
- Knockout Plus$10 a month
- FreeFree
- Pay-as-you-go$0.02 a month
- Knockout Plus$10 a month
- VolumePriced on request
In their own words
Knockout API
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.