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I've researched a lot about this,

found how to know if the APK is 32bit or 64bit https://stackoverflow.com/questions/30348216/how-to-find-if-apk-is-32-bit-or-64-bit

I tried going to the developer area in my phone => process manager and still couldn't see running apps' architecture.

tried installing a couple of task manger apps too, still no luck.

I think Google play automatically detects CPU architecture and installs the correct version

https://developer.android.com/google/play/publishing/multiple-apks

https://developer.android.com/distribute/best-practices/develop/64-bit#test-64-bit-hardware

and apparently since 2019 August, Google play requires all apps to have a 64-bit version. https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html

but when I go to Chrome => chrome://version, it shows 32-bit

so I'm looking for a universal way to find out whether the installed app on my phone is 32bit pr 64bit.

I'm using Android 9

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    You can look at the output of adb shell dumpsys package and check the primaryCpuAbi – or use e.g. my tool Adebar which creates a device documentation for you, listing the architecture for each app. Unfortunately, this seems not always to be set (for several apps it is just "null" – in which case Adebar cannot show it either).
    – Izzy
    Feb 20 '20 at 23:28
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    Java apps are neither 32-bit nor 64-bit: android.stackexchange.com/a/208132/218526 Bitness matters only if app includes prebuilt native libraries inside .apk. In this case extract the .apk (in any unzip utility) and check the binaries or .so files using e.g. file command or hexdump etc. Feb 21 '20 at 2:14

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