There are a lot of us using xdrip app, installed on our android phones/watches. There are advantages and disadvantages compared to Dexcom app, but the advantages outweigh disadvantages for me, so I’ve been using it for three years, since I started on G6.
You can find lots of info on this forum and elsewhere online, maybe start here:https://forum.tudiabetes.org/t/could-someone-provide-an-easy-explanation-of-xdrip/80816
p.s. as far as I know (I could be wrong) xdrip does not support G7 directly, but only in “companion” mode. This is not an issue for me since I am still using G6. If you are already using G7, then personally I would wait until xdrip supports G7 directly before switching to xdrip.