Yes, and it is the best time to start. Add your game while its Steam page still says "coming soon" and LaunchRivals shows you which weeks give it the most room.
- Your Overview and Release Radar list the quietest weeks coming up for a game like yours.
- Your rivals are suggested from your store page tags, released or not.
- Once you set a date on Steam, the radar shows how your week stacks up against the rest.
Already out? You can still add your game. Rival Watch, alerts, the store check and comparable launches all work for released games too.
Tip: add your most important tags to your Steam page early. Your rivals and your radar get sharper with every tag.