The Soulmate Equation

The Soulmate Equation

by Christina Lauren

4.4 (25,821)

4.4 stars from 25,821 reviews. One of the highest rated Contemporary Fiction books we track.

368 pages~6.1 hr readPublished by Gallery BooksPublished 2021-01-01

$9.9923% off peak

Last checked: Jun 1, 2026

Price history: $1.99 $12.99

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Perfect for you if...

  • You love romance that balances genuine emotional stakes with witty banter and chemistry that crackles on the page.
  • You appreciate protagonists who are smart, flawed, and dealing with real-world pressures like single parenthood and financial strain.
  • You're drawn to the tension of forced proximity plots where two people who claim to hate each other gradually realise they're actually perfect for each other.

Maybe not for you if...

  • You prefer your romance without science fiction elements or experimental premises that might feel contrived.
  • You're looking for a purely emotional, introspective love story rather than one grounded in plot mechanics and external pressure.
  • You want a standalone that doesn't rely on knowing Christina Lauren's previous work or their established fan base.

About this book

Single mom Jess Davis is skilled with data and statistics, but refuses to return to dating after a difficult past: her father was absent, her mother left when she was six, and her ex rejected fatherhood before their daughter was born. Working constantly to support her family leaves her isolated. When Jess learns about GeneticAlly, a DNA-based matchmaking company, she decides to try it—trusting in numbers rather than chance. Her test reveals a 98 percent compatibility match with Dr. River Peña, GeneticAlly's founder. The problem: she already knows him and considers him stubborn and arrogant. GeneticAlly offers payment for them to spend time together as their most compatible pairing, a "Diamond" match meant to boost the company's value. Desperate for income, Jess accepts despite her skepticism. As Jess and River are pushed together at various events, she begins to see beyond her initial impression of him and questions what the science of soulmate matching truly means.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$6.50$12.99Nov '20Nov '22Apr '23Apr '24
$1.99$12.99

Price has dropped 4 times over the last 6 years. Goes on sale roughly every 590 days. Typically stays discounted for 25 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#14#16,847#33,679Nov '20Oct '22Apr '24Jul '26

Currently around #26K in the Kindle store — a steady mid-list seller.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

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3.5★4.3★5.0★May '23Oct '23May '24Jul '26RatingReviews

Currently 4.4★ from 25,821 reviews

Gaining approximately 274 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.4 over the tracking period.

Sale Prediction

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Free$6.50$12.99Nov '20Nov '22Apr '23Apr '24PredictedJun '26

Actual Predicted

This book goes on sale roughly every 590 days. Next drop estimated in about 71 weeks. Typical discount: 85% off.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Christina Lauren

2 books on Vagrant Press

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