That’s a tricky question. Let’s explain it. We have been developing emojis apps for 6 years. In that time we have been solved all the bugs in our emoji apps to get to the minimum bugs. The main reasons of new bugs is the OS (operating system) updates that changes the functionality of your phone. But as expert developers, we can solve them fast.
iOS and iPhone are near to the 99% free users bugs but Android phones are really complicated. Due to the particular android market which contains more than 10k different devices, we can’t guarantee a 100% crash free user, but thanks to our experience we will try to reduce to the minimum. That’s because it’s the same app and a problem solved on a Samsung can make a new one a Huawei phone.