Alter, an artificial intelligence startup that helps creators and brands express their virtual identity, has been acquired by Google for about $100 million, according to a source.

The acquisition was completed a couple of months ago, but neither the companies nor the public knew about it. Some of Alter's top executives have changed their profiles to say that they have joined the search engine. The source wants to remain anonymous because they are sharing nonpublic information.

The financial terms of the acquisition were not disclosed by the company.

Facemoji was a platform that offered plug-and-play tech to help game and app developers putavatar systems into their apps. Seed funding for the startup was $3 million.

Facemoji became Alter.

A person familiar with the matter said that Alter would be used to improve and ramp up its offerings.

Jon and Robin did not reply to the request for comment.