CoinOS works great. The main dev is super helpful and responsive. Were you using Mutiny on the web? Some people have concerns about the security of web wallets and it is not self-custodial, but if you are comfortable with those risks/trade offs it is a great option right now.
Discussion
Yeah it's just my kids spending' sats they earn from chores and whatnot. Anytime they earn sats i help them designate how much goes to their spending wallet vs their savings. I keep their savings in self custody cold storage. Their spending wallet i buy out with cash whenever they want to spend it. Turns out most the time they don't want to spend it cause NGU lol.