When launching iOS 7, Apple brought support to the system 64-bit applications. In February 2015, it announced that all new applications should include 64-bit support. As there was, at first, no obligation, several apps already present in the App Store remained in 32 bits, many of them until today.
However, an ultimatum warning began to be triggered on iOS 10.3, notifying that 32-bit apps needed to be updated or would stop working on the next versions of Ma's mobile operating system.
Based on this release and Apple's strong incentive to build 64-bit applications, we can assume that most developers have already taken note of this and updated their apps. This idea is not wrong, but the minority that has not updated represents a very large number, as shown by the data analysis firm SensorTower.
Judging by the graph, basically 92% of apps have already been upgraded to 64 bits, while 8% of apps have not yet been upgraded. Even if it seems small, the total of applications still 32 bits is around 187k. This number may be even greater due to the fact that the firm has considered only apps that have not been updated since September 2013; that is, many others, earlier, may have appeared in 32 bits but are not in the search.
With the arrival of iOS 11, which should be presented at the Worldwide Developers Conference (WWDC) 2017, the bet is that all applications still in 32 bits will become obsolete and stop working completely. In addition, we must not forget the “cleaning” that Apple has been doing in the App Store, removing all applications that have not been updated in recent years or that no longer follow their terms.
So stay tuned if you are a developer or even a user of 32-bit apps because in a while they may not work anymore.