Yes, using a guitar tuning app can be a cheap and convenient option to tune your guitar. But it’s important to search for a good and accurate guitar tune app for that. However, it’s important to keep in mind that these tuner apps might only work in small rooms and quiet spaces. If you’re playing as a professional, or on stage, a guitar tuner app might not be suitable for you. Since these apps use your smartphone’s microphone to pick up the tune, they can also catch other frequencies and sounds from the background which can result in inaccurate reading of tone.