Backdrop vs Knockout API
Backdrop
backdrop.softfieldlabs.comKnockout API
useknockout.comSide by side
| Figure | Backdrop | Knockout API |
|---|---|---|
| Price from | — | $0.02/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 5 | 7 |
| Spec score · Green Screen Software | 8.2 (#11) | 8.0 (#13) |
| Spec score · AI Video Background Removers | 8.2 (#11) | 8.2 (#12) |
| Integrations | The privacy policy names Clerk, Supabase, Modal, Razorpay, PostHog, and Vercel as service providers. | Official client options include Node, React, Python, and CLI, alongside REST and any HTTP client. |
| Security | API keys are hashed, scoped to an account, and revocable; webhook signatures use HMAC-SHA256. | The privacy policy says API tokens are SHA-256 hashed, passwords are managed by Supabase Auth using bcrypt, and traffic is encrypted via TLS. |
| Support | The maker lists [email protected] for support, partnerships, higher-volume workflows, and billing questions. | The site lists community support for Free, email support for Pay-as-you-go, and Slack support for Volume. |
Plans
Backdrop
- Free trialFree
- Starter$9, paid once
- Creator$29, paid once
- Studio$79, paid once
- EnterprisePriced on request
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
Backdrop
Backdrop has no write-up on Specifiction yet; its figures are above.
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.