According to the frequently asked questions page on FormDoc's website, the application is only designed for Windows, so you won't be able to use it on Chromebooks and Android or iOS mobiles devices. Furthermore, the developers don't seem to have any intention of creating a Chrome OS version in the near future.
However, in case you need an alternative solution, I recommend checking out Google Forms.
Can FormDocs be used on Chromebooks?
According to the frequently asked questions page on FormDoc's website, the application is only designed for Windows, so you won't be able to use it on Chromebooks and Android or iOS mobiles devices. Furthermore, the developers don't seem to have any intention of creating a Chrome OS version in the near future.
However, in case you need an alternative solution, I recommend checking out Google Forms.