Am I Allowed to Post About My Product if It's Free?

Hey Indiehackers,

I'm genuinely asking if I'm allowed to post about a webapp if it's free. I don't want to spam or go against the community culture so let me know! I won't post the link to the webapp until someone enlightens me. It's a streamlining review and feedback for creative content like videos and images(i.e. timecode comment, etc.)