Keyshape doesn’t actually produce Lottie animation. It just outputs graphics (SVG’s) that can be used to create a Lottie animation. What is needed to create Lotties are SVG’s and .JSON files.
Lottie animation was created by Airbnb to replace GIF’s. While Lotties are smaller in size than GIF, there are limitations to Lottie animations. GIF’s are larger because they can create richer animations. Think of GIF’s as small movies.
Airbnb uses Adobe After Effects along with two plugins to create Lottie files. Sketch can output SVG, but not .JSON. Affinity Designer can output both SVG and .JSON.
With Sparkle 3 95% of users will download stock Lotties (what few exist) from the web while 5% will create Lotties form scratch. Lottie animation is very new technology. Kudo’s to Sparkle for getting out on the bleeding edge here, but it remains to be seen wether Lotties are a fad.