Sherpas: Smart SEO

I love this app! I installed this one for Json-ld and it worked in a flash. Just integrated the app and it created the proper data structure for me. It also has other good features like meta tags and alt text configuration that is a plus point. It's very affordable too and their customer service is also prompt and good.
I was worried that somehow the app will affect my website loading time but it didn't. I'm super satisfied!