[scarface74]

There is a way to provide upgrade pricing for iOS. It's an ugly hack though....

2015 - you sold v1 for $5.00

2017 - you start selling v2.

You sell v1 for $5.00 but in the description tell everyone not to buy it.

You sell v2 for $5.00 but direct people who have already bought v1 to buy the bundle of v1 and v2 that you price at $8. Anyone who has already bought v1 can buy the bundle for $3.

[chii]

and now, you have v3. The bundling will grow exponentially!

[sokoloff]

It’s quadratic, not exponential. For N versions, you have prices:

  N * (N + 1) / 2

It is likely that you could reduce to something approaching an upper bound of 2*N, as with version 8 out, you can drop support for a discounted upgrade from v2 to v4.

[chii]

I stand corrected!