This is a new app, and I just installed on my Gmail via Chrome extension today May 20, 2021. Most of it looks great, with features such as adding team members, organizing templates by folders/categories, and a nice user interface. Yet, it's lacking a "Edit HTML code" button on their user interface (which uses the TinyMCE plugin (https://www.tiny.cloud/tinymce/features/). The app has lots of choices to edit text such as bold, font type, size, colors, etc... Yet, no way to edit the full HTML code, which is a total shame... Contacted the team over live chat, but no one was available, and the last time they logged in was 10 days ago... so NOT sure this app is actively being developed... we'll see.