ngram viewer is a free Chrome add-on developed by partaab.com. This add-on allows users to analyze the changes in popularity of words over the last centuries. With ngram viewer, you can compare phrases by separating them with a comma, set the beginning year to either 1500 or 1800, and view the trends of word usage.

The tool is incredibly simple to use. It connects you to the "Google Ngram Viewer", a powerful tool that displays the historical usage of words. Whether you're a language learner or a researcher, ngram viewer can help you understand the evolution of words and make better word choices. The add-on requires no special permissions and does not collect any data from users.

To use ngram viewer, simply open the add-on using the shortcut key Alt+N, type in the word or phrase you want to analyze, and press Enter. It's that easy!

Please note that if you are using the data for academic purposes, it is recommended to cite the original paper mentioned in the add-on's description.

Overall, ngram viewer is a valuable tool for anyone interested in studying word popularity and usage trends over time. It provides a simple and accessible way to explore the changes in language throughout history.