Love the concept and it might be something that I would purchase in the future if the following display option suggestion was added. Would love to see a "dark mode" option added as the glaring white background is very hard on the eyes, especially at night. This is an excellent idea though, keep up the great work!...

You can find an opening explorer in every good chessprogram, but I have to say it is a good idea, but really too expensive. My grandmother can makes this on her computer. Maybe 1.5 euro is reasonable.