Appcelerator is a privately held mobile technology company based in San Jose, California. Its main products are Titanium, an open-source software development kit for cross-platform mobile development, and the Appcelerator Platform.

Founded in 2006, Appcelerator serves industries including retail, financial services, healthcare, and government. As of 2014, it raised more than $90 million in venture capital financing.

On February 24, 2021 Axway announced in one of their company blogs that Appcelerator was being discontinued by March 1st, 2022 and they would be releasing their Titanium SDK into open-source