The Kiss Quotient Reading Order
| Title | Published | Buy on Amazon |
|---|---|---|
| Kyssfaktorn | 2018 | N/A |
| The Kiss Quotient | 2018 | Buy |
| Love Challenge | 2019 | N/A |
| The Bride Test | 2019 | Buy |
| The Heart Principle | 2021 | Buy |
| Heart Story | 2022 | N/A |
Helen Hoang writes fiction under The Kiss Quotient series, which contains all six of her published books. The series launched in 2018 with both Kyssfaktorn and The Kiss Quotient (the latter appears to be the English-language edition), and continued with Love Challenge and The Bride Test in 2019, The Heart Principle in 2021, and Heart Story in 2022.
The presence of non-English titles like Kyssfaktorn and Love Challenge alongside their English counterparts suggests Hoang’s work has been published in multiple languages and markets. The core English-language trilogy (The Kiss Quotient, The Bride Test, The Heart Principle) forms the backbone of the series, with each book released a year or two apart.