Most comparison pages open with the writer's strongest ground. This one cannot, because the first thing you will find out anyway is the price, and you would be right to distrust everything after it if I had led somewhere else.
CredyApp is listed at $22 per user seat per month. RosterSafe is $25 per active provider per month. Those are different units and the difference compounds. A firm with 2 coordinators looking after 20 providers pays roughly $44 a month on their unit and $500 on mine. Their bill grows when you hire. Ours grows every time you take on another provider, which is to say every time the thing I am useful for gets bigger.
I am not going to argue my way out of that. If cost per month is the deciding factor, this comparison is over and you should go and look at them. What I can tell you is what the per-provider unit is for, and you can decide whether it is worth the gap. The cost-of-lapse calculator is the honest way to size that gap, and its worked example is taken from CredyApp's own writing on credentialing denials rather than from mine.
A per-provider cost is the same shape as the fee you already charge your own client practices per provider, so it passes through cleanly at a margin you control. A per-seat cost does not map onto anything you bill and has to come out of your own overhead. That is a real difference for a firm whose business model is per-provider, and it is a completely irrelevant one for a firm that simply wants the cheapest tool that works.
One caveat on their number: CredyApp does not publish pricing on its own site. The per-seat figure comes from its Capterra listing, which is the only public number I could find. Treat it as indicative, and get a quote before you plan around it.