On the developer agreement page, under the “restrictions on use of licensed materials” sections, a new clause banning the “use or access the Licensed Materials to create or attempt to create a substitute or similar service or product to the Twitter Applications” has been added.
Last Tuesday, Twitter’s Dev account tweeted that it is “enforcing its long-standing API rules. That may result in some apps not working.” The company did not really clarify that it was banning third-party clients. Popular apps such as Tweetbot and Twitterrific, which were affected, were created long ago and are said to have come up with features the Twitter app now uses.
On Thursday, Twitterific’s Sean Heber announced the client had been discontinued. “We are sorry to say that the app’s sudden and undignified demise is due to an unannounced and undocumented policy change by an increasingly capricious Twitter – a Twitter that we no longer recognize as trustworthy nor want to work with any longer,” Heber wrote in a blog post.
Fenix developer Matteo Villa has pulled the Android version of the client from the Play Store but tells Engadget the iOS version still had API access as of last Thursday. “I’m left with an app working fine on iOS that people are still buying, but I’m wondering if I should pull it too,” he says.
Other developers have started shutting down their applications.