What are some alternatives?
When comparing Lang API and Localize, you can also consider the following products
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
Weblocale - Localization management with automatic translation
Smartling - Website localization & translation
Voog - Voog is a mess-free platform that enables you to build awesome websites with a creative flow.
Phrase.com - Translate your software better. Edit and share locale files online. Work with your translators or order professional translations for your localization project.