App Radar can be used without an app connection for keyword research and competitor analysis.
If your app is not live yet, but you still want to start well-prepared, you can simply add an app that is similar to yours (same target group, similar keywords, motorization etc.).
Then you can analyse the rankings, track keywords, check out your competitor creatives for inspiration and write your metadata directly in the Store Listing Editor.
Check out also: How to do a Metadata update (Step-by Step guide).