The package includes a CD plus printed and photo extras: a CD envelope, outbox, booklet, postcard, one random photocard (1 of 3), a fabric card, an instant photo, and a poster.
A retailer-exclusive edition includes an additional postcard. When ordered online, that exclusive edition is fulfilled via random selection.
The package dimensions are listed as 258 × 176 × 26 mm.
Indigo is classified as K-pop.
Reviewers praised the songwriting, lyrics, production quality, and genre variety; 87.5% of 42 reviews described the album as a 'no-skip' listen.
The album includes one photocard chosen at random from three possible variations.
The product description states that Indigo is the artist's first solo album and notes that it includes collaborations with various artists.