"No One" has been certified Diamond by the Recording Industry Association of America (RIAA), and has sold 5.6 million copies worldwide.

Critically acclaimed, it won Best Female R&B Vocal Performance and Best R&B Song at the 50th Annual Grammy Awards (2008).

Keys told MTV News Canada that the song, "is really talking about the way that in relationships, the way that so many things are around you all the time to try to distract you.

Remixes of the song featuring Lil' Kim, Damian Marley, Junior Reid, Beenie Man, Barbee, and Kanye West exist.

The official remix has a different but similar beat from the original version and features rapper Cassidy; it was produced by Swizz Beatz.

[5] Chuck Taylor of Billboard wrote that the song "shows the soulful chanteuse acting her age, in the best possible way" and that Keys "hold[s] back on the mastery of vocal craft to let cool, crisp production lead", adding that it "heralds her youth, while maintaining Keys' lockdown on penetrating hooks and soul-sopped production with a buoyancy that makes it a blast to sing along with.

[7] Alex Fletcher of Digital Spy gave the song four stars out of five and called it "simplistic yet beautiful, fluttering, piano-tinkling ballad", the lyrics of which "expose Keys' vulnerability and current loved-up status".

[8] David Mead of Paste commented that the song "showcases a new depth and width to the tone of her voice, which seems to get closer to that of Aretha Franklin with each album.

"[9] Nekesa Mumbi Moody of The Washington Post cited "No One" as one of the "gems" of the album and stated it "recalls a Bob Marley groove".

[13] In November 2012, Complex placed it at number one on their list of "The 25 Best Alicia Keys Songs", commenting that the "production was supreme, her vocals were at their strongest, and beyond technical merit".

With only one full day of airplay, "No One" debuted at number 65 on the US Billboard Hot R&B/Hip-Hop Songs chart on the issue dated September 8, 2007.

[30] The single was commercially successful in Europe as well, peaking at number two on the European Hot 100 Singles as well as reaching the top position in Hungary and Switzerland, and peaked within the top ten of the charts in Austria, Belgium, Denmark, France, Germany, Italy, the Netherlands, Norway, the Republic of Ireland, Slovakia, Spain, Sweden, and the United Kingdom.