I tried it
When you fill out your order, you can select from a list of foods that you don't want, which includes beef, lamb, poultry, etc etc. By deselecting any animal products you can receive vegetarian meals. But I don't think it would be worth the high cost. When I tried it I was eating mainly plant foods but some seafood. One meal contained Chilean sea bass which is a very expensive fish. Oh gosh it was good! Everything I tried was delicious. However, they did accidentally send one chicken meal which I had deselected.
Overall, Freshology was the best tasting and highest quality meal delivery program I've ever tried, and I've tried almost all of them (not as a way of life but because I review them). If I could have afforded to keep it, I would have.