What costs are involved with registering for a developer account/s?

The costs associated with registering for a developer account vary between the Apple App and Google Play Stores.

The Google Play Store requires a one-off fee of AUD $25 to be paid upon registering.

The Apple App Store requires a yearly subscription of AUD $150 to be paid; once upon registering and subsequently every 12 months for the duration you wish to have your account active.