The 15 dimensions of a book: what makes two books feel alike

Ask someone why they loved a book and they rarely say “because it was fantasy”. They say it was gripping, or funny, or it wrecked them, or it was the perfect thing for a long weekend. Genre is what bookshops sort by. What readers actually respond to sits underneath it.

Match Book describes every book along fifteen dimensions. Together they're a book's “reading DNA”: enough to say what a book is like to read, and to find others like it, without giving away the plot. Below is what each one measures, why it's on the list, and how common each value is across the 1,407 books Match Book has read so far. These figures come live from the catalogue and change as it grows.

Mood / feeling

The dominant feeling of reading it: cosy, dark, tense, funny, eerie, and so on. For most readers this is the dimension that matters most, and it cuts straight across genre.

• Tense25%
• Adventurous20%
• Eerie17%
• Dark13%
• Melancholy8%
• Hopeful6%
• Funny4%
• Cosy2%
• Romantic2%
• Heartwarming2%

Browse: cosy, dark, hopeful, tense, funny, melancholy, eerie, adventurous.

Pace

Plot-driven page-turner or character-driven slow burn. Pace decides whether a book fits the attention you have right now.

• Moderate46%
• Fast paced44%
• Slow burn10%

Browse: slow burn, fast paced.

Tone / weight

Weight, meaning how much the book asks of you. Light and escapist, balanced, or heavy and literary.

• Balanced48%
• Light and escapist27%
• Heavy and literary26%

Browse: light and escapist, heavy and literary.

Genre

The shelf a book sits on. It's the coarsest signal of the fifteen: useful for ruling things out, weak for telling two fantasy novels apart.

• Fantasy24%
• Thriller15%
• Science fiction11%
• Narrative nonfiction9%
• Mystery9%
• Horror8%
• Literary fiction6%
• Historical fiction5%
• Young adult5%
• Contemporary fiction3%

Browse: literary fiction, historical fiction, contemporary fiction, fantasy, science fiction, mystery, thriller, romance, horror, young adult, memoir, narrative nonfiction, classics.

Length

Short (under about 300 pages), medium, or long (over about 500). Readers tend to underrate how much this matters.

• Medium56%
• Short28%
• Long16%

Browse: short, long.

Ending style

How it resolves, without spoilers: happy, bittersweet, ambiguous, dark, or a cliffhanger. Plenty of readers care about this and never get told in advance.

• Resolved and happy47%
• Bittersweet14%
• Ambiguous14%
• Cliffhanger14%
• Dark10%

Browse: bittersweet, ambiguous, dark, cliffhanger.

Themes

What the book is about underneath the plot, up to three per book: grief, family, power, identity, survival and so on. Themes are how a thriller and a literary novel can turn out to be about the same thing.

• Identity47%
• Secrets39%
• Power and politics33%
• Family27%
• Survival24%
• Friendship19%
• Justice18%
• Loss and grief16%
• Love13%
• Class and society13%

A book can have up to three themes, so these add up to more than 100%.

Browse: family, identity, loss and grief, survival, coming of age, friendship, power and politics, secrets.

Setting: place

Small town, big city, the wilderness, an invented world. Some readers have strong, often unnoticed, preferences here.

• Fictional world23%
• Multiple locations20%
• Big city18%
• Small town12%
• International10%
• Suburban7%
• Wilderness or sea5%
• Rural5%

Setting: time

Contemporary, recent past, historical, future, or no single period.

• Contemporary40%
• Timeless or multiple23%
• Historical17%
• Recent past10%
• Future10%

Narrative style

Point of view and structure: first or third person, one viewpoint or many, dual timelines, letters and documents. Some readers can't get on with first person at all; some love an epistolary novel.

• Third person, several viewpoints39%
• Third person, one viewpoint26%
• First person, one narrator22%
• First person, several narrators7%
• Letters, documents or mixed forms3%
• Dual timeline3%

Browse: dual timeline, letters, documents or mixed forms.

Series vs standalone

Standalone, first in a series, a later instalment, or a companion book.

• Standalone67%
• First in a series18%
• Later in a series13%
• Companion1%

Browse: standalone, first in a series.

Publication era

New release, recent, modern classic or classic. A proxy for prose style and assumptions as much as for date.

• Recent56%
• Modern classic29%
• New release9%
• Classic6%

Popularity

From mega-bestseller to hidden gem. It isn't a quality measure. It's here because many readers deliberately want one end or the other.

• Well known40%
• Moderately known35%
• Mega-bestseller13%
• Hidden gem12%

Browse: hidden gem.

Author experience

Debut, early career, established or prolific veteran. Debuts are riskier and fresher; veterans are more polished and more predictable.

• Established40%
• Prolific veteran29%
• Early career21%
• Debut10%

Browse: debut.

Author gender

Included because many readers are curious whether their reading skews one way without meaning to. Match Book never uses it to decide that two books are similar.

• Female57%
• Male41%
• Multiple or unknown1%
• Nonbinary1%

Why fifteen?

Any set of dimensions is a trade-off. With too few, very different books look identical: “dark fantasy” covers a lot of ground. With too many, every book is unique and nothing matches anything. Fifteen is enough to tell a cosy fantasy from a grimdark one, and a slow literary thriller from a breakneck airport one, while still finding real neighbours for almost every book.

It also matters that the dimensions are mostly independent. Mood and pace, for instance, vary separately: there are fast dark books and slow dark books, fast cosy books and slow cosy ones. Each dimension adds information the others don't already carry.

Every book page shows all fifteen, and the taste guide explains how to use them to understand your own reading.