Guitar Tuner - Tune by Ear is a free Chrome add-on developed by pluraldev.com. As the name suggests, this program allows users to tune their guitar by ear. With 12 different tunings available, guitarists can easily find the perfect sound for their instrument.

The tunings range from the standard E A D G B E to more unique options like Open D and Open G. Users can either click directly on the strings buttons or use the enter key to hear the sound. The right and left arrow keys can be used to select the string.

The program offers two playing modes: manual and auto. In manual mode, users can choose to play the sound using the string button or the play button. In auto mode, the sound is played automatically and advances to the next string. The play button can be used to play and stop the sounds.

Additionally, users have the option to set the number of times the sound will be played for each string. This feature, called "Repeats by String," allows for customization and fine-tuning.

Overall, Guitar Tuner - Tune by Ear is a convenient and user-friendly tool for guitarists of all levels. Whether you're a beginner or an experienced player, this add-on provides a simple and effective way to tune your guitar accurately.