Here we look at the FC/CYA ratio (see link in my signature) to determine your FC based on your CYA. That is a newer way of pool management vs what you might see printed on some test kits, pool stores, etc.
To answer your question... Since it's not in your signature, we're assuming you do not use a salt water generator (SWG). Also, you didn't actually say which app you're using. If your CYA is 50, then you'll want to keep your FC between 6–8. You can safely ignore FC recommendations from pool stores, pool guys and even pool test kits. This is the source you can rely on: