reverse-image
TinEye
The oldest dedicated reverse-image engine, indexing more than 70 billion images and specializing in exact and edited copies, including the earliest indexed appearance of an image. The web search is free to use manually; the API is paid, so there is no automated route here. Especially valuable when you need to date an image or establish where it first surfaced.
No programmatic check — opens the archive’s own search.
Why it’s useful & how it works
Free web search (CF-challenged via proxy). API is paid (pre-purchased bundles), no free tier → link-only for us.
What’s inside
70B+ images.
API access
https://api.tineye.com/rest/search/ (HMAC-signed, PAID bundles)
An API key is required — usually free; see the endpoints above for where to get one.
Access
Programmatic API access (a key may be required — see the API tag).