Shapr is great - and works on the iPad. However… the above statement isn’t quite correct. The Mac-version will probably be on the same level as the Windows version (V6) in about a year. There’s already a WIP-version. Pricing: the above mention prices are one time payments. McNeel doesn’t have subscriptions at all. That means you get all uppgrades for free until the next version (V7) ships - which would be in about 5-6 years. Just divide the price with 5-6 years.
I don’t know anything about Rhino gold, though. You’ll have to ask your question on the Rhino forum.
HTH
Philip