FSM Designer 4+

Interface is not intuitive. For example: right clicking on a state and selecting edit does not edit that state, it edits the state that is in edit mode. You put a state in edit mode by clicking the edit button in the tool bar and clicking the state. But that doesn’t edit the state, you still have to right click and select edit. And basic functionality doesn’t work reliably. Clicking edit on a state doesn’t always bring up the edit window. Arcs are difficult to edit. Drag and drop is buggy. Arcs don’t move their atttacnment points based on relative location, so they overlap the states or each other when you move them around. At one point I ended up adding several states trying to edit the first. Still haven’t gotten a machine working, but I’m hopeful.
Not worth paying for yet, maybe worth $1.99 if it worked.

As the 3y old reviews mention, FSM Designer is not intuitive nor functional.

Naively, I thought the old complaints were stale and that the FSM Designer was updated to address the mess. I was mistaken and would have been better of using free alternatives and giving the money to charity or a coffee.

As a software engineer, I'm impressed with the gall these guys have to sell this unfinished piece of software!