checked SS iOS prices

Did some digging at the Apple Apps Store. Looked up SkySafari from Simulation Curriculum Corp. It is described as "Astronomy Guide To Night Sky."

https://apps.apple.com/ca/app/skysafari/id1257281849

• SkySafari (basic) $3.99
• SkySafari 6 Plus $9.99
• SkySafari 6 Pro $27.99

All are said to have "Offers In-App Purchases."

Oh ho! So it is NOT FREE for iOS...

https://apps.apple.com/ca/developer/simulation-curriculum-corp/id791341744

So I'll have to be careful in my recommendations...