Developer tool ZeroPush gets acquired by Twitter

ZeroPush, a developer tool with roots in Philadelphia, got acquired by Twitter, the duo behind ZeroPush recently announced. Terms of the deal were not disclosed.
They wrote on their website:

Almost three years ago, we started ZeroPush because we were frustrated by the complexity involved in sending push notifications to our apps. Our goal was to make developers’ lives easier with simple and powerful tools. Thousands of you agreed, and have used our API to send hundreds of millions of notifications.

It’s akin to an acquihire: ZeroPush cofounders Adam Duke and Stefan Natchev will both work on Fabric, Twitter’s mobile development platform. They’ll be based in Twitter’s Cambridge office.
It feels like a natural move, as Duke joined Twitter in the spring of 2014 through a connection from the local Ruby development community (specifically, PromptWorks cofounder Greg Sterndale). He worked on ZeroPush part-time, while Natchev worked full-time on it for the last year, according to a Twitter spokeswoman.
The tool, which helps developers integrate push notifications into their apps, will shut down in January 2016, and a Twitter spokeswoman said to “stay tuned” to see how ZeroPush is integrated into Fabric. The tool grew from two hundred customers in early 2014 to thousands.
Duke and Natchev used to work at Old City’s Artisan Mobile together.