Lovato is a mezzo-soprano. She has three octave vocal range.Nick Levine of Digital Spy commented on her vocals, for her album Don't Forget, stating "she's certainly a stronger singer than the Jonases. In fact, her full-bodied vocal performances are consistently impressive."Becky Brain of Idolator wrote that Lovato has a "killer voice and the A-list material to put it to good use".According to Sophie Schillaci of the The Hollywood Reporter, the entertainer "has a voice that can silence even the harshest of critics. Something not often found in her peers."For Lovato's second studio album, 'Here We Go Again,' Jeff Miers from The Buffalo News wrote "Unlike so many of her Disney-fied peers, Lovato can really sing" and wrote that it was "refreshing" that Lovato does not need Auto-Tune "to mask any lack of natural ability".Upon working with Lovato on her third studio album 'Unbroken,' Ryan Tedder stated "Demi blew me out of the water vocally! I had no idea how good her voice is. She's one of the best singers I've ever worked with. Literally, that good... I mean, she's a Kelly Clarkson-level vocalist. And Kelly has a set of pipes". He also commented on their work together on the song 'Neon Lights,' from Lovato's fourth studio album, stating "She in pop music has one of the biggest ranges, possibly the highest full voice singer I've ever worked with."Tamsyn Wilce from Alter The Press commented on her vocals on 'DEMI', stating "it shows just how strong her vocal chords are and the variation of styles that she can completely work to make her own."In a review for the 'Neon Lights Tour,' Mike Wass from Idolator commented "you don't need shiny distractions when you can belt out songs like Demi and connect with the crowd on such an emotional level."In a review for the 'Demi World tour,' Marielle Wakim from Los Angeles Magazine commented on Lovato's vocals, stating "For those who haven’t bothered to follow Lovato’s career, let’s get something out of the way: the girl can sing. Get over your fear of being judged by your Facebook friends and Spotify her discography, because you’re going to have the last laugh five years down the road (probably sooner) when she wins a Grammy. At 22 years old, her vocal range is astounding." She went on to further describe her vocals as "spectacular."