I don't know anything about MyPlan, but if it's not working for you try:
Free with ads for the web version (assume data sales), $2.99 app purchase, $5.99/month subscription for "Gold" level. Probably the most comprehensive tracker that includes sleep, weight, micronutrients, etc. (Some of those features may only be available with the upgrade.)
Free to try for one month, then $2/month (no ads, no data sales). You can add your own recipes, set up different plans for different days, scan UPCs to add foods. Not as pretty as some, fewer colorful charts, etc. But it is the cheapest ad-free/no data sales option and is straightforward to use, if you just want something to track what you're eating.
Basic version is free (assume data sales, not sure what the ad status is since I haven't used it); premium is about $3.50/month. I'm not sure if you can add your own recipes. Premium will give you access to meal plans, their recipes, etc.
Those are the top three that I'd suggest checking out. My Fitness Pal, which is otherwise pretty popular, is not low-carb friendly. Last I saw you couldn't track net carbs, etc. So that's probably one to avoid.
Full disclosure: I use Joy and like it, but I have no other affiliation with it or the other companies. I've considered switching to Chronometer, but for three times the prices, I'm not sure it's worth it for me. And I might just end up with something similar, but prettier.