Crypto tracker

What's the best tracker to use on mobile, with no ties to an exchange or wallet? I used to use the FTX one and then with their downfall and the bear market I haven't been following as close. With the inevitable bull run and halving I've been getting prepared but haven't found a good mobile app. I'm looking for the ability to "buy and sell" coins whenever I please without having to actually commit to the transaction in real life, more or less the ability to see the value of what I have at any given time. If I do buy more or sell, I can just follow up in the tracker.

I tried the Delta app, but everytime I load it up, midway through loading it kicks me out and puts me back on my phone homescreen.

Any suggestions?