Yes, there is a BlogSpot app available for both Android and iOS devices. The app is called "Blogger" and it is developed by Google, which also owns BlogSpot. With the Blogger app, you can create, edit, and publish blog posts directly from your mobile device. You can also view your blog's analytics, manage comments, and upload photos and videos. The Blogger app is free to download and use, and it can be a convenient tool for bloggers who want to manage their blog on the go.