Hi
@JoJo257, I didn't use any apps, just the Carb and Cals pocket counter and an A5 note book and pen. I still use it. Just mark down what I eat and the carbs and calories in separate columns, and my BG level 2 hours after eating. I no longer test after every meal as I know what I can eat, but instead I now add my daily calorie use from my fitbit as I'm on maintenance and need to balance the amount of calories I use against what I eat to avoid putting weight on again.
I used Slimming World successfully decades ago, but now I follow a very low carb diet which isn't what you really get with WW or SW.
You may want to look at the thread "What did you eat yesterday". There are some really good ideas which may help. There may also be people along soon who know of apps etc. Being a bit of a Luddite I'm much happier with paper and pen! Best of luck
🙂