You could ask a set of potential customers what it would be worth to them. You could calculate the cost savings that your tool provides to their buyers, and ch

You could ask a set of potential customers what it would be worth to them. You could calculate the cost savings that your tool provides to their buyers, and charge a little less than that (e.g. 20%). You could look for similiar tools than yours (not direct competition - interpret similarity broadly here), and price by analogy. The best pricing practice might be if you combine the three above, and they give roughly similar estimates.