it is. Such accessories are compatible with ALL Gopros because the connection has remained the same.

Yes it is compatible with the GoPro Hero 4 Session

According to my research and the manufacturer's specifications, it is compatible with the Hero 5 up to and including the Hero 11, including the Max. The correction of the information has already been requested. Furthermore, the manufacturer states that this headstrap is compatible with the Hero 12 and newer. - GoPro Strappy](https://www.digitec.ch/de/s1/product/gopro-strappy-hero11-black-mini-hero8-black-hero-9-black-hero-8-black-action-cam-zubehoer-36115072?tagIds=520-1143) The correction of the information has also been requested here. As both are compatible with older models, I assume that the requested model would also fit, as the connections are the same up to the current Hero 13.

Yes / yes! :)

no unfortunately not

yes it is

yes is compatible

I have no idea. I'm sorry.

Can be done... but this is more for the helmet: GoPro Helmet Strap (Head / Helmet Mount)

No, unfortunately none. However, I can recommend the following article: https://www.digitec.ch/de/s1/Product/2762979 I tested this about a month ago and was very satisfied.