The album was supported by the Charli Live Tour, beginning in Atlanta on 20 September 2019 and concluding in Mexico City on 21 October 2020.

Charli XCX and executive producer A. G. Cook continued recording the album in November 2018 at Flume's studio in Los Angeles, California.

Recording continued in Eagle Rock from January to March 2019, where the majority of the album's songwriting and production took place.

[9][10] Charli XCX debuted "Gone" with Christine and the Queens at Primavera Sound in Barcelona on 30 May[11] and "2099" with Troye Sivan at the Go West Fest in Los Angeles on 6 June.

[15] The album's second single is the original version of "Track 10", a song from Charli XCX's mixtape Pop 2, titled "Blame It on Your Love".

[20] The third promotional single, "February 2017", features American singer-songwriter Clairo and Korean-American electronic music artist Yaeji, and was released on 6 September 2019.

The music video for "2099", showcasing Charli XCX and Sivan riding on jet skis, was released a week later on 17 September 2019.

[24] In a five-star review, Bethany Davison of The Skinny wrote "Charli is an expansive record, flooded with joy and heartache, consolidated in its array of features.

"[29] Neil McCormick of The Telegraph commented that "The sexy android cover and star-studded collaborations (including alternative icons Lizzo, Haim and Christine and the Queens) on her third album, Charli, suggest an all-guns-blazing pitch for blockbuster status.

But the contents are far weirder than that implies [...] Come the century's end, you can almost imagine future critics scratching their AI-augmented brains and still touting Charli XCX as the next big thing.

Jacobs praised the track "Silver Cross", but criticised others such as "Thoughts" and "Blame It on Your Love", which he described as "an unneeded revamp [that] seems to exists just because her and Lizzo share both a label and rising profiles in the industry.

"[36] Rachel Aroesti of Q gave the album a mixed review, writing, "Between Cook's trademark production and the song-stealing brilliance of her collaborators, it often feels as if Aitchison's nasal croon and counter-intuitive toplines are the least interesting bits of her own project."