Which Android App Creator/Maker to use for displaying sensor values.

Dear Arduino-fellows,

For a project, I'd like to display the sensor data I am sending over an ATMEGA328P and a bluetooth low energy chip using an Android app.

I have no experience in creating apps and absolutely puzzled where to start. I've googled these options:

  1. https://flutter.dev/
  2. https://cordova.apache.org/
  3. Thunkable: Build powerful, native mobile apps without coding.
  4. http://ai2.appinventor.mit.edu/

Could you recommend an app to code following functionalities:
displaying the last sensor readings of multiple sensors
graph plotting of each sensor value for 1h, 6h, 12h, 24h, week and month

Thank you!

Have a look at Blynk.
it has a fairly low threshold for getting started.