If perhaps you used something like Instant Demo (which hasn't been updated for a while), you have seen this before. The big detail is that this kind of program used Flash for output, which is a big no-no right now, as it is not on by default and will be retired completely by the end of the year.
I actually used the program the first day after the release (and bought it shortly after) but I didn't post a review as I hadn't done a full video with it.
Now I have – just a page that only had a description of a process – How to Print a ZIP file .
So, what is nice about HelpXPlain vs Instant Demo? First, the HTML/JS output, and second, it is mostly easier to edit your screencasts in. They are mostly a bunch of slides, which you can easily remove or duplicate.
Of course, I am not great at this – there are some awkward pauses in my screencast – but I think it took me about an hour, while working on the script and learning the program, which I think is just fine.
Size and responsiveness are pretty great for me. Adding the screencast is a bit harder than a YouTube video, but the simpler way is just a few lines of HTML and uploading a few files (it adds to 4.6 MB, 28 files).
One very nice thing is that you can also add the screencast to Help files. HelpXPlain is made by the same company as Help+Manual, which I really like, and have used for years. While most software now consider Help files outdated, I still like them (and you can post them online, anyway – they have search and everything). It also supports translation (as separate projects), with paid AI translation support. I didn't try that, though.
Overall, I really like it, specially considering how new it is. Very much worth considering for your screencast or support videos.
PS: They don't have an affiliate program (that I know of), so I don't get anything from this review.