You can submit Roblox Rivals concept art through the official Nosniy Games Discord server, in the #rivals-concept-art channel, which is unlocked at Level 5+ in the server.

How to get access

  1. Join the official Nosniy Games Discord server.
  2. Level up in the server until you reach Level 5.
  3. Go to #rivals-concept-art and post your art there.

What people are saying

Community posts also point people to the official Discord rather than unofficial places for submissions. That matches the wiki guidance that the concept-art channel is the main submission path.

Quick note

If by “concept art app” you meant a drawing app to make the art, that part is separate — the submission step is still the Discord channel above.