Use this app to drag/drop your Rive and Lottie files to compare performance using the Rive JS runtime and the Lottie Web Player.
Rive also introduced experimental Lottie support as an import. Try it out in the Rive editor.
Drag/drop a Rive file and it will play the first state machine or animation in the file using the Web (JS) runtime.
Drag/drop a Lottie JSON file and it will play the animation using the Lottie Player.