Does that happen when you run the sample app and use words from the sample app’s vocabulary? Normally, if there is any difference, it is the simulator which is worse since it has a different and simpler driver. If there is a problem with recognition on an actual device, that will come down to an implementation issue so it might be helpful to share some background on how the app is set up. My main recommendation would be to go through the tutorial and documentation so you can be sure that your expectations are in line with the capabilities of the SDK.