I’ve installed this on two sites so far, combined with Mailster, and it is working well. They do explain its a Beta, and free. I have only seen one backend display bug when it first loaded, but never saw it again.
I’ve made mainly inline content forms. The design options are block based and more than enough for basic forms, but nothing like two stage forms, etc you might get with a paid option. I own ConvertBox, but found this plugin a much easier solution for getting basic forms up fast for Mailster.
I made a site wide bottom of post content form in like 5 minutes and had it done and published. For that kind of use case its awesome.
As of this review, there is only one other, from 10 months ago saying its broken. but it’s not now. So I thought I would chime in to help support this free development effort.
Some key things are a bit hard to find, like display preferences (inline, popup, all posts, select pages, etc) they are just at the bottom of the block editor column.
I’ve had Mailster license for a long time, and its nice they have finally started building a block based form builder.