I honestly haven't seen an app that offers betting tips, my advice would be to look for apps that offer you good info in order for you to place your bets. I only use the Oddstrader app, in my opinion, this is the best app. I'll leave the link in here if you want to check it out
https://www.oddstrader.com/sports-betting-app/Will check it out today, is it paid or free? I don't have a problem paying but never use my credit card on such apps.
Most of the time i don't do much research and just go with what I feel on that particular day. For example, no matter what I am always going to bet on Nadal on clay even if he is playing against Djokovic and odds are low because that's how I think.
There used to be a sports betting predictor named Joca I used to follow sometime ago and he was decent as well

.