The EP was commercially successful upon release, selling over 225,000 units and peaking at number two on the South Korean Gaon Album Chart.

[9][10] The group's name, Iz*One (stylized in all caps), was suggested by netizens through the official Produce 48 website and chosen by CJ ENM.

[16] Sakura Miyawaki appeared in a Shiki Theatre Company musical production of The Lion King (2008–2009) prior to joining HKT48,[17][18] while Nako Yabuki played roles in the 2005 film Touch and various Japanese television dramas and commercials.

[24] Lee Chae-yeon previously competed in SBS' K-pop Star 3 and JYP Entertainment's reality competition show Sixteen.

[26] Kim Min-ju had appeared as an actress in music videos and Korean dramas, notably the 2018 MBC television series Tempted, in which she portrayed the young Choi Soo-ji (Moon Ga-young).

[32] The group's debut extended play (EP) Color*Iz was released on October 29, 2018, with "La Vie en Rose" as its lead single.

[33][34][35] A debut showcase concert, the Color*Iz Show-Con, was held in conjunction with the album's release at the Olympic Hall in Seoul, South Korea; tickets were sold out within one minute.

[39] The EP recorded sales over 34,000 units in its first day of release, setting a new record for the highest number of albums sold on the first day of a girl group's debut release;[40][41] the music video for "La Vie en Rose" was viewed more than 4.5 million times in its first 24 hours on YouTube, making it the most-watched debut music video by a Korean act in 24 hours at the time.

[43][44] It received a platinum certification from the Korea Music Content Association (KMCA) on July 9, 2020, 20 months after release, after surpassing 250,000 shipment figures.

[8] On March 9, English DJ and producer Jonas Blue released a new version of his 2018 hit single "Rise", featuring Iz*One's vocals.

[61] Meanwhile, the lead single "Violeta" peaked at numbers 18 and five on Gaon Digital Chart and Billboard K-pop Hot 100, respectively.

On July 6, the group participated in the annual music festival KCON, held at the Madison Square Garden in New York City, their first U.S.

[69] It debuted atop on both the Oricon Singles Chart and Billboard Japan Hot 100,[70][71] receiving a platinum certification from the RIAJ in July 2019.

[73] Like the previous release, it topped both domestic charts in Japan with first week sales exceeding 200,000 copies,[74][75] leading to a gold certification from the RIAJ.

[76] Following their commercial success, the group became Oricon's best-selling new artist for the first half of 2019,[77] accounting for an estimated ¥510 million (₩5.5 billion) of total sales in Japan between December 10, 2018, and June 9, 2019.

[91][92] On January 6, 2020, the Iz*One members' agencies and CJ ENM reached an agreement that the group would resume promotional activities.

[104] On December 7, Iz*One released their fourth EP, One-reeler / Act IV, accompanied by its lead single "Panorama".

[106] On February 15, 2021, five Iz*One members (Kwon Eun-bi, Sakura Miyawaki, Kim Min-ju, Jo Yu-ri and Jang Won-young) participated in the release of a promotional single, "Zero:Attitude", with singer Soyou (who previously trained the group in Produce 48) and rapper pH-1.

Iz*One's official fanbase, Wiz*One, began an initiative called Parallel Universe on April 21, 2021, in an attempt to prevent the group's upcoming disbandment.

[108][109] On June 19, 2021, CJ ENM confirmed that discussion with the Iz*One members' agencies was underway to potentially relaunch the group.

[114] As an active group, Iz*One endorsed and collaborated with G-Market,[115] Fever Basket,[116] Olive Young's Colorgram:TOK,[117] Sudden Attack,[118] Miche Bloomin',[119] and PepsiCo.