I've been using Prompt Builder before it landed on AppSumo. Part of the reason I was looking for a product like Prompt Builder was because I'm a heavy user of Straico, and my spidey-sense was tingling a couple of months back, thinking that the wheels might fall off pretty soon.
I needed a simple prompt library that I could count on, and Prompt Builder definitely does that, and it does it well. But what really surprised me was the optimizer.
I didn't buy it for the optimizer, and I didn't think I would use it, but as it turns out, I've taken many of my existing prompts I had in the Straico platform, ran them through the optimizer, and ended up with much, much better prompts.
When I touched base with the founder shortly after purchasing Prompt Builder to request the ability to bulk export my prompts from Prompt Builder, he put it in place really quickly, and it does exactly what I requested it to do. Now I have much more confidence in loading Prompt Builder full of my most important prompts, knowing I have a very simple bulk export feature in case anything happens in the future.
I'd like to see more sharing features, but for my use case this is a simple product that does exactly what I need, and it does it well. If you want to try it, you should definitely check out the optimizer.