shameless plug. 4 months ago I released my own similar app. you can visit it here. http://99gifs.com/studio http://99gifs.com/studio Everything is done client

shameless plug. 4 months ago I released my own similar app. you can visit it here. http://99gifs.com/studio http://99gifs.com/studio Everything is done client side, it uses web workers to render the gif so it doesn't block the UI and it's fast.