software – Pin descriptions on objects in photos

I can’t remember the name of the framework online and that’s driving me nut. Basically I have a panoramic photo with many objects inside and I want to pin a description box on them.
The idea is easy, I am learning a language and every time I see an object I don’t know the name I can click on the object (or just beside) a spot appears and I can type a title and a description (optional). So later I can see the photo again and rehearse, and when I don’t remember the name I just have to click on the spot on the object to reveal it.
This is just my use-case and I remember seeing this type of website online before and one demo was a kindergarten and the descriptions in the picture were used to promote the place.
But I can’t remember the name even when I type some keywords. Maybe someone knows the name of this website?