Hello,
Hope you Are Doing Well,
I have gone through your requirement, and I want to introduce myself, This Is Akil, Having Great Experience in Ionic, IonicV2, IonicV3, MEANjs, It will work in Android 6+ and Upgraded Version, It will Support in all Version,
Every Day code will be push on Github, For Offline Work, we will use SQLite,
Please add me for more discussion, I will share my past work with you
Thanks & Regards
Akil