Google search has a built-in tool for tuning your musical instruments — here's how to use it

Google Tuner is an instrument tuning tool available through Google search in any desktop or mobile browser.
Hosted on MSN

'LikeTones' Is a Guitar Tuner With No Ads or Upsells

I've been trying to get back into playing guitar and I've noticed one thing: Both the App Store and Google Play are replete with guitar-tuning apps that are full of either upsells or advertisements.