"XO" received generally positive reviews from
music critics. Mike Wass of the website
Idolator described it as a "radio-ready anthem... [which] is impossible to beat".
Vanity Fair writer Michelle Collins described it as "the most upbeat and catchiest song of the lot" on the album. Ryan Dennehy from the website
AbsolutePunk opined that "XO" was a guaranteed, triumphant hit. Andrew Hampp and Erika Ramirez of
Billboard magazine described "XO" as "magical" further calling it the most radio-friendly song on the entire album with its traditional pop structure. Peter Tabakis from the website Pretty Much Amazing listed the "magnificent power ballad" as one of the "potential chart-toppers" of the album. Michael Cragg of
The Guardian called the track a "joyous, echo-laden heart burst," and an immediate choice for a single.
Stereogum's Tom Breihan found "an immediately apparent
hit [in
Beyoncé is]... the incandescent 'XO'". Rob Harvilla from
Spin found "monster-single potential" in "XO". Lindsay Zoladz of
Pitchfork Media praised the song's "big, boundary-obliterating" pop appeal and hailed it as a future
blockbuster and hit. The song's pop and sing-along sound and production received praise by critics.
Greg Kot from the
Chicago Tribune described the song's production as "predictable" and opined that the audience sing-along chorus sounded like it was created specifically for being performed during an arena encore. Similarly, Nathan S. of the website DJ Booth wrote that the song was suitable for "ecstatic" fans to sing along without efforts during a stadium concert: "This is the kind of chorus that's going to be sung at full force in traffic jams for months to come, and while XO may be relatively more subdued, that call and response is destined to be a monster when performed live, right down to the way her voice shows a little wear, just like it would at the end of a show."
Jody Rosen writing for
Vulture found a "cavernous widescreen" anthemic pop sound in the song further saying that its chorus sounded like it was specifically made for an
Olympics opening ceremony. Carrie Battan of
Pitchfork described the song as a "stadium-filling" one and classified it as one of
Beyoncés "decorous moments". Joe Lynch from
Fuse described "XO" as the "most uplifting" pop song since
Florence and the Machine's "
Shake It Out" (2011). He praised the electronic flourishes, saying that they managed to "keep the music from veering into banal territory" and concluded that the song has a "quirky" sound previously unheard on other material by Beyoncé. Lavanya Ramanthatan of
The Washington Post described the song as a "swelling anthem" and one of the highlights of
Beyoncé. Caitlin White from the website The 405, hailed "XO" as "the album's crowning track... [it] feels like even more of a triumph". Philip Cosores from
Paste magazine noted that the song, along with several others in the closing portion of the album, was "probably the best of her career". Jordan Sargent from
Complex magazine described "XO" as the "purest love song" on
Beyoncé. However, a more mixed review came from Claire Lobenfeld of the same publication who felt that it was the only skippable track of the album due to its "mawkish" feel. Similarly, Chris Kelly of
Fact magazine wrote that the song "reeks of Ryan Tedder's paint-by-number hitmaking".
Recognition and accolades Under the Radars Ryan E.C. Hamm argued that "XO" made "a strong case" for being included as song of the year on several year-end lists; however he noted that this was not possible as the lists had already been compiled and published when the song was released. However, Rob Sheffield of
Rolling Stone placed "XO" at number 8 in his year-end list of the 25 best songs of 2013. The song was further ranked at number 72 in the annual
Pazz and Jop mass critics poll of the year's best in music. In 2014,
Vultures writer Jody Rosen listed the song at number 52 on his list of "The 150 Greatest Schlock Songs Ever" calling it "an instant classic": "The grand, sparkly production screams 2013; the theme — how love bears out to the edge of doom and all that — is timeless." The same year, he further included the song in his list of the best songs by Beyoncé published in
The New York Times. In 2019,
Pitchfork listed
XO at number 182 on their greatest songs of the decade (2010s) list. "XO" is nominated in the category for Best Song at the
2014 World Music Awards.
Usage in media Toyota featured the song, along with Beyoncé, in their 2014 commercial as part of the "Get Going" campaign. In 2018,
Louis Vuitton featured the song in the company's first fragrance film starring Emma Stone. The TV series
The Summer I Turned Pretty, featured the song in the eighth episode of its second season, during Isabel “Belly” Conklin and Jeremiah Fisher’s kiss. ==Chart performance==