CoverHook
7.3#1 in ai thumbnail generatorsFrom $99 a yearFree planWebAPI
VisitCoverHook vs ThumbnailGo
ThumbnailGo
7.2#5 in ai thumbnail generatorsFrom $9 a monthFree planWebAPI
VisitWhat both publish
| Fact | CoverHook | ThumbnailGo |
|---|---|---|
| API | The generation API uses account API keys and the same credit balance, processes jobs asynchronously, and supports idempotency keys for retries. | API access is included with Ultra. |
| Generation speed | Standard generations take about 40 seconds while Pro quality generally takes 60–90 seconds. | The homepage advertises sub-second generation and instant variations. |
| Licence | No open-source licence is stated; CoverHook is presented as a hosted web service and HTTP API. | Terms identify the engine, code, interface assets and presets as ThumbnailGo intellectual property and publish no open-source licence. |
| Output | YouTube thumbnails can be output at 2048×1152 in 2K or 1280×720 in 1K, both at 16:9. | The home page says each generation is automatically upscaled to 4K and can be exported or published to the creator gallery. |
| Ownership | Users retain ownership of their inputs and generated covers, while CoverHook receives a limited licence needed to operate the service. | The terms say users retain ownership, copyright, and distribution rights to generated thumbnails, and grant a display license if they publish to the community gallery. |
| Product | CoverHook generates AI cover images, with finished artwork and typography designed together for the selected format. | ThumbnailGo generates AI thumbnails from text prompts and style selections for creators. |
| Security | The privacy policy says API keys are stored as SHA-256 hashes, sessions use signed HttpOnly cookies, and the company holds no security certification. | The maker describes SSL/TLS in transit, sandboxed servers and tokenized Google OAuth authorization. |
| Support | The Studio plan includes priority support; privacy and data requests are handled by email, with a stated target response time of 30 days. | The pricing comparison lists Community support for Free, Email for Pro, and Priority support for Ultra. |
CoverHook plans
- FreeFree
- 2,000-credit pack$29.90, paid once
- 4,000-credit pack$59.90, paid once
- Pro$99 a year
- 10,000-credit pack$99.90, paid once
- Studio$199 a year
ThumbnailGo plans
- FreeFree
- Pro$9 a month
- Ultra$29 a month
Pick CoverHook if…
CoverHook suits creators who need designed covers or thumbnails across its supported formats, particularly YouTube creators who want variant generation and fit checks. Its API may suit workflows that need asynchronous generation, retries, and account-based credit use.
Pick ThumbnailGo if…
ThumbnailGo may suit YouTube creators who want prompt-based thumbnail generation, with paid plans offering additional styles, quality options, and image blending. Ultra may fit users who need API access or a commercial license.