How to do app development on low end Android device ?

Question

Any website or offline compiler .This phone is a very old model please help me

Answer 1

Debugging isn't the only issue you will have. Actually running and writing on the device will be hard.
Unless it's older than android 7 try termux from playstore or f-droid. I would forget native android apps but anything else barring storage and performance issues should be possible.
Install many compilers and interpreters. Learn the basics from the built-in help menu or website.
It can help and be great but effort must be invested by you alone.
If possible get a cheap desktop which meets the minimum requirements of android studio as that's the recommended developement platform for android apps.

Answer 2

Lower than kitkat?If you have to developpe for less than 19 API you can choose your emulator in android studio to try with it.