The service has 5 million users across its Web, iOS and Android smartphone versions, said CEO Luis von Ahn, and is among the most popular education apps. Read this article by Dan Farber on CNET News.
The service has 5 million users across its Web, iOS and Android smartphone versions, said CEO Luis von Ahn, and is among the most popular education apps. Read this article by Dan Farber on CNET News.