Yes, the FAFSA4caster is free and gives you an estimate of your eligibility for federal student aid and once you are ready to apply fill out your FAFSA form.
Am I allowed to compare schools?
You are certainly able to compare schools by changing the cost of attendance, deleting state aid if you will be an out-of-state student, or modifying the amount of aid available from the school, among others.
Will FAFSA4caster help me understand my options?