What is a good app or site to find, follow a healthy vegetarian diet?

Find a good guide: If you're going to be a vegetarian and remain healthy, you have gained the moral high ground and may feel better, but you will need to supplement. For this, you'll need a relationship with a sympathetic dietician, physician, or other guide who knows you as an individual. Best wishes, and if you choose to undertake this, be discerning.