What it does
Line detail is a separate control from audience, not something audience locks in for you. There are four weights — Extra bold, Bold, Medium, Fine — picked with a chip in the second step of building a book. Choosing an audience fills that chip in with a sensible default for the age group, but it does not fix it: pick any of the four weights for any audience, which is exactly how a large-print adult book ends up as Adults + Bold instead of the Adults default of Fine.
| Audience | Age | Default line weight | Typical topic shape |
|---|---|---|---|
| Toddler | 2–4 | Extra bold | One big object, plain background |
| Preschool | 5–7 | Bold | Simple scene, few objects |
| Kids | 8–11 | Medium | Scene with light detail |
| Teens | 12–15 | Fine | More elements, finer detail |
| Adults | 16+ | Fine | Dense, orderly pattern |
| Cozy | — | Medium | Warm, calm scenes with open space |
From Skate Park Afternoon (Teens) · Make one like it
Why weight is a default, not a lock
A line weight that never matched the audience would be a real problem — fine lines under a toddler-scale single object waste the room a young colorist needs, and extra-bold lines forced onto a dense adult pattern collapse into a blob where detail should be. That is why picking an audience sets the chip for you: the topic planner's scene complexity and the line weight start out in agreement, so you are not guessing at a sensible pairing from scratch. But it stays a chip, not a rule — a Teens book meant to double as a gift for a younger sibling can drop to Bold, and an Adults book meant for low-vision printing can do the same, without switching audience or losing the audience's topic style.
Where the six defaults actually differ
Toddler through Kids step the default down (extra bold, bold, medium) while topics grow from one plain object to a lightly detailed scene. Teens and Adults both default to fine, the thinnest weight, matched to their denser topic style. Cozy is the one break in that pattern: its topics are calm, open, low-clutter scenes rather than a packed adult pattern, so its default sits at medium instead of fine — a deliberate difference the table above is easy to miss if you assume Cozy is just "Adults, warmer theme."
What it does not do
- It does not stay locked to the audience's suggested default — any of the four weights is selectable for any audience, in either direction.
- It does not let you mix weights within one book; a single build uses one weight for every page, so a book meant to step up in detail across sections needs to be split into separate books instead.
- It does not offer a fifth, in-between weight — Extra bold, Bold, Medium, and Fine are the full set, and there is no numeric or custom line-width input.
Sources
Last verified 2026-09-04. Updated 2026-09-04.