Tune your guitar online on proguitartuner.com. If you can not see the tuner you and you are using an iOS device (i.e. iPhone or iPad): you must download our guitar tuner app If you are using a computer you need to: download the latest Adobe Flash Player.. You might not be able to use the guitar tuner in all browsers. If you experience any problems please contact us. Hope this text will help you to tune your guitar online, otherwise do not hesitate to contact us and we will try to solve your problems!