Do you use serp checker?

We are working on a new serp checker tools. I would like to get some suggestions from you guys to get feedback and make the software better.

Do you use serp checker tools or do you prefer to check your queue manually?
Do you also check the ranking of your competitors?
What is the monthly cost for a serp checker?
What is a must-have feature for you to need a rank finder (such as unlimited site tracking or unlimited keyword insertion)?
What do you think are the essential features of a queue finder tool?

We want to give direction to the software according to this feedback, I would be glad if you share your thoughts. When we put the software on sale, we will give extra discounts to people who share your opinions here.

Thank you to everyone who shared their views