This link was shared so I’ll share it with other creative minds.
theplot.io is a very basic online storyboarding application.
Free access is very limited but may be enough to get where you want.
Gif animation is supported so that is a definite plus!
Here’s a quick storyboard I threw together asking if the theplot.io will be adequate. The fox character was drawn in the app but all other images in OpenToonz and then drag/dropped into the plot.
Very simple. Very basic. That’s very good. 🙂