Initially promoted as the lead single from Braxton's fourth studio album Calling All Lovers, it was replaced by her 2015 release "If I Don't Have You" and was only included on the record's Walmart deluxe edition.

Al Sherrod "A-Rod" Lambert, Braxton, and Ericka J. Coulter wrote "Let Me Know", while Harmony Samuels and Tiyon "TC" Mack produced the song.

"Let Me Know" was written by Al Sherrod "A-Rod" Lambert, Tamar Braxton, and Ericka J. Coulter, while it was produced by Harmony Samuels and Tiyon "TC" Mack.

[2] After recording her parts of the song, Braxton said that she "felt [Future] should be on it" and had her manager Vincent Herbert set up the collaboration.

[4][10][11] Its composition samples American singer Aaliyah's 1994 cover of The Isley Brothers' single "(At Your Best) You Are Love" (1976),[2] by adopting the chorus "let me know".

Jeff Benjamin of Fuse connected the content with Braxton's comment on the state of R&B music, when she said: "[the genre] is on the rise because we're not afraid to talk about what's really happening in our personal relationships."

Throughout the song, Braxton sings lyrics to her partner such as: "We've been through so many things / Ups and downs and in-betweens / If you need more love from me / I give you more, just let me know.

[2] Future does not sing a separate verse, but provides the song's hook instead; his vocals are processed through Auto-Tune, which Benjamin described as part of the performer's "signature" style.

"[16] Wetpaint's Afiya Augustine described Future as "the male persona to complement Tamar’s lyrics of staying by her man’s side no matter what".

[13] Writing for Mic, Leight praised her inclusion of the Aaliyah sample, and her decision to work with Future, as indications of her awareness of trends in contemporary music.

[12] Due to her use of whistle notes in the single, she also compared Braxton to American singer Mariah Carey,[12] as did Jeff Benjamin, who wrote that "[she] is not playing when it comes to vocal acrobatics".

[2] Latoya Cross of Jet commended the singer's range and her connection with the song, explaining that "it’s obvious she’s in touch with every lyric".

[10] The glitter bodysuit was also positively received by Stacy Lambe, who felt that it was inspired by Britney Spears' music video for her 2004 single "Toxic" and Beyoncé's photoshoot for Flaunt.