Comparing British and American usage

Google Ngram Viewer can compare the popularity of words and phrases over time. For example, typewriter and mobile phone:

It can also compare their popularity in British and American English. For example, mobile phone and cell phone:

As in the chart above, add :eng_gb_2012 (books published in Great Britain) and :eng_us_2012 (books published in the United States) to your word or phrase.