Amazon’s GameCircle framework has just gone cross-platform — as of Thursday, iOS developers can integrate the cloud service into their apps. The iOS programming interface mirrors its Android counterpart’s ability to sync achievements, leader boards and saved games across devices, even if the player switches operating systems. Developers can also post any achievements and scores to Apple’s Game Center. The tools are free to use, so those who want to build GameCircle into their next iPhone title just need to visit the source link to get started.