There has always been a robust ecology of outside clients for Twitter.

There has always been a robust ecology of outside clients for Twitter.

When you want more functionality, less algorithmic suggestions, or a different design, they're fantastic.

When you want more functionality, less algorithmic suggestions, or a different design, they're fantastic.

However, the corporation has long sought to limit the utility of third-party clients, even to the point of capping the number of users for a given third-party client.

However, the corporation has long sought to limit the utility of third-party clients, even to the point of capping the number of users for a given third-party client.

But as of now, none of them appear to be functional.

But as of now, none of them appear to be functional.

Whether on design or not, it appears like Twitter has disabled its third-party API, putting users who depend on such applications in the dark.

Whether on design or not, it appears like Twitter has disabled its third-party API, putting users who depend on such applications in the dark.

It's unclear if a remedy is in the works, as the problem has persisted since around 10:30 p.m. ET on January 12th.

It's unclear if a remedy is in the works, as the problem has persisted since around 10:30 p.m. ET on January 12th.

Many users and third-party app developers have reported the issue on Twitter.

Many users and third-party app developers have reported the issue on Twitter.

Paul Haddad, the creator of Tweetbot, spoke with TechCrunch and informed the website that ever since last night, none of his app's API requests have been successful.

Paul Haddad, the creator of Tweetbot, spoke with TechCrunch and informed the website that ever since last night, none of his app's API requests have been successful.

Haddad no longer has a direct line of communication with Twitter, so it's unclear exactly what is happening.

Haddad no longer has a direct line of communication with Twitter, so it's unclear exactly what is happening.