Tumblr is a widespread blogging and social networking service that allows users to publish various types of content. Users can publish “tumblrs” or short blog posts and customize their pages according to their preferences.

API functions: The Tumblr API contains several methods for performing various actions, including getting information about users, subscribing to or unsubscribing from blogs, liking or unfollowing posts, getting a list of blog posts, and editing or deleting posts.

Popularity: As of the end of 2018, the platform contained more than 450 million different blogs.

Price: The API is provided free of charge.

Ease of use: Tumblr has done a great job of ensuring that its API is functional and flexible so that it can be embedded into any application. In addition to detailed documentation in the most popular programming languages, it also offers a large collection of useful resources for developers.