Here’s a quickie I was able to throw together in about 10 minutes (including making an account and figuring out the basics of the app). It’s pretty much a standard timeline-based creator, pretty decent for free.
Edit: My fade animation isn’t triggering, at least for me. So that’s like minus a million points to the app haha.
Edit: They make you pay to save animated gifs. I’m sure there’s another utility that doesn’t charge.