cannot use recorderhq pro as a complication on watch

Hello,
I just started using recorderhq pro on my iphone and watch mostly for the stereo recording feauture and because it has such an easy interface. I guess I cant use stereo recording when making recordings on the watch but its nice to have the same app on both devices.
anyway, I wanted to have the app on my watchface as a complication and while I have a space free i dont see it in the list for complications that can be used.
Is it not possible to use this app i nthis way? I thought that you could place all your apps on your watch face as long as ithad room...
Is there any way to contact the developer about this?
Thanks in advance for any ifno,
Greetings, Anouk,